python list slicing

Slice notation allows you to skip any element of the full syntax. Basic Slicing and Indexing¶. ). Indexing and slicing in Python language, one of the many features that programmers use to ease their data formulation. Python Lists Access List Items Change List Items Add List Items Remove List Items Loop Lists List Comprehension Sort Lists Copy Lists Join Lists List Methods List Exercises. Python offers an array of straightforward ways to slice not only these three but any iterable. Slice assignment allows you to update a part of a list with new values: Here we do not change the number of elements in the list. Creating a list is as simple as putting different comma-separated values between square brackets. 6. If the length does not match, Python throws the exception: By providing start and stop values we can narrow the replacement area: We can also use del statement to remove a slice out of a list: Here we’ve removed a bunch of elements in the middle of nums list. Write a python program to find the common numbers from two lists . In the case of lists, a single slice will always be of contiguous elements. ... Slicing. This way is extended slice; see an example below. You can also use them to modify or delete the items of mutable sequences such as lists. close, link Slices can also be applied on third-party objects like NumPy arrays, as well as Pandas series and data frames. The list is a most versatile datatype available in Python which can be written as a list of comma-separated values (items) between square brackets. You can return a range of characters by using the slice syntax. Let’s take a simple example: Here we defined a list of colors. Slicing lists helps in fetching sections (slices) of the list. How to create Floating amp-addthis in Google AMP ? In addition to live coding most of the solutions to the list copying problem, I’ve also share some performance metrics as well as my solution to the challenge below. Below is an example of a 1d list and 2d list. The slice will … 슬라이싱(slicing) or 슬라이스(slice): 연속적인 객체들에(예: 리스트, 튜플, 문자열) 범위를 지정해 선택해서 객체들을 가져오는 방법 및 표기법을 의미합니다. Slices can also be applied on third-party objects like NumPy arrays, as … Slice notation takes the form where start is the index of the first element to include, and stop is the index of the item to stop at without including it in the slice. This article prepared background for tackling indexing and slicing in NumPy ndarrays and Pandas Series and DataFrame objects. To access a range of items in a list, you need to slice a list. The slicing is a Python methodology that enables accessing parts of data from the given sequence like lists, tuples, strings etc. Python(3.X) 파이썬 슬라이싱(slicing)이란? Railsware is a leading Ruby on Rails company which provides contracting and consulting services around the world. We can use stop value to stop taking before some element. The provided list should exactly match the number of elements to replace. The second way is a trick that applies to other iterables in Python. We can access a range of items in a list by using the slicing operator (colon).Slicing can be best visualized by considering the index to be between the elements as shown below. Python also indexes the arrays backwards, using negative numbers. Do a similar thing to create a new variable, upstairs, that contains the last 4 elements of areas. Each item in the list has a value(color name) and an index(its position in the list). One way to do this is to use the simple slicing operator i.e. Only some list values are updated. In negative indexing system -1 corresponds to the last element of the list(value ‘black’), -2 to the penultimate (value ‘white’), and so on. The slice object is used to slice a given sequence ( string , bytes , tuple , list or range ) or any object which supports sequence protocol (implements __getitem__() and __len__() method). The slice () function returns a slice object. E.g., if you want to have a reversed list which starts from 80: So, we start from the -2 element (value 80) and go from right to left collecting all the elements in a reversed list. With slices we can extract an arbitrary part of a list, e.g. Python slice () The slice () function returns a slice object that can use used to slice strings, lists, tuple etc. Python Slicing. In our example start equals 2, so our slice starts from value 30. stop is 7, so the last element of the slice is 70 with index 6. start refers to the index of the element which is used as a start of our slice. Writing code in comment? One way to do this is to use the simple slicing operator i.e. A sliceis a subset of list elements. In slicing, the first item is the start index and the second is the stop index. Python uses zer… You can also specify the step, which allows you to e.g. If some slicing expressions are made that do not make sense or are incomputable then empty lists are generated. Leaving the Initial and End as blank. Suppose we have a list of the marks of 50 students. An iterable is, as the name suggests, any object that can be iterated over. A reversed list can be generated by using a negative integer as the IndexJump argument. Do a similar thing to create a new variable, upstairs, that contains the last 4 elements of areas. Specify the start index and the … And because slice deletion mutates the underlying object, it’s not applicable to immutable sequential types. The result of slicing a list is a new list containing the extracted elements, and the original list is not modified. List slicing refers to accessing a specific portion or a subset of the list for some operation while the orginal list remains unaffected. 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In the case of lists, a single slice will always be of contiguous elements. In the end, slice creates a new list(we named it some_nums) with selected elements. To access an element by its index we need to use square brackets: Using indexing we can easily get any element by its position. In python, slicing of a list is done to extract part of the list. List slicing. The full slice syntax is: start:stop:step. What is List comprehension? This means that accessing a slice doesn’t change the original value of the sequence. The last character has index -1, the second to last character has index -2. We can access a range of items in a list by using the slicing operator (colon).Slicing can be best visualized by considering the index to be between the elements as shown below. The syntax of slice () is: Python Lists Access List Items Change List Items Add List Items Remove List Items Loop Lists List Comprehension Sort Lists Copy Lists Join Lists List Methods List Exercises. Updated December 26, 2020. you must read basics of list in python as this article is extended part of basic of list article. Python Language Shifting a list using slicing Example def shift_list(array, s): """Shifts the elements of a list to the left or right. But assignment and deletion operations are not applicable to immutable sequential types. This is what’s called as Python list slicing. Slicing in Python When you want to extract part of a string, or some part of a list, you use a slice The first character in string x would be x[0] and the nth character would be at x[n-1]. The list is one of the most useful data-type in python. By concatenating sliced lists, a new list can be created or even a pre-existing list can be modified. to achieve the same effect. As we cannot use 1d list in every use case so python 2d list is used. We need to choose the Intial and End value according to a reversed list if the IndexJump value is negative. You can specify where to start the slicing, and where to end. Or we want to go on a frenzy and extend a list with an arbitrary number of new cells in any position? This is the syntax: Slicing in Python When you want to extract part of a string, or some part of a list, you use a slice The first character in string x would be x and the nth character would be at x [n-1]. Reversing a List in Python using the List Slicing. It’s a good example of “learn once, use everywhere”. For example − Similar to string indices, list indices start at 0, and lists can be sliced, concatenated and so on. There are a lot of similarities between these structures, but there are also a lot of subtle differences and gotchas which will be discussed in upcoming articles dedicated to the machine learning techniques the Railsware team makes use of. But it’s also possible to change cell content using an assignment operation: We can freely use positive or negative indexing for assignment. In this case, we want to enumerate elements from the tail of a list. Using reversed () for Python list reversal If the slice list contains at least one comma, the key is a tuple containing the conversion of the slice items; otherwise, the conversion of the lone slice … For example: Using a negative indexer will set the start/stop bounds relative to their position from the end of the list, so my_list[-5:-2] re… Slicing is a feature in Python that lets you access parts of sequences like strings, tuples, and lists. [3, 4, 5] from the list >>> theList[2:5] [3, 4, 5] Since the Python list follows the zero-based index rule, so the first index starts at 0. Indexing creates a reference to an element of an iterable by its particular position within the iterable; slicing is a subset of all elements from an iterable based on their indexes. That’s why they are not applicable to immutable sequential types. Also, any new data structure can add its support as well. In plain English, this means we can retrieve a part of a string, tuple, list, etc. ). Of course, we can use an arbitrary negative step: One important thing to notice – is that list slice creates a shallow copy of the initial list. We are among the premium ruby on rails companies on the US market and our ROR development company is the exeperts at Ruby, Rails, HTML 5, and CSS3. and objects that support sequence protocol. List slicing is the process of extracting a portion of list from an original list. Python List slicing: Using the … But what if we want to take the last element of a list? The Python slice() function allows us to slice a sequence. It’s also possible to replace a bigger chunk with a smaller number of items: Adding step allows to replace each n-th element with a new value: Using slice assignment with step sets a limitation on the list we provide for assignment. brightness_4 So, it goes from the last element to the first element. In python sequence data types, we can access elements by indexing and slicing. It creates a shallow copy of the whole list and is a good shorthand when you need a copy of the original list. To be able to slice, one must familiarize first with the concept of indexing. By using our site, you List initialization can be done using square brackets []. It has a mystic syntax, which is as follows. Slicing a list gives us back a new list. How to create Comparison accordion using Google AMP amp-accordion ? What is Slicing in Python? To perform a slicing operation on a list, there are two methods which are mentioned below: using python slice function ; using index syntax for slicing; Using python slice function. In plain English, this means we can retrieve a part of a string, tuple, list, etc. This is where slice() can be used to take a section of the list. Negative step turns everything upside down. We discussed two key list operations: indexing and slicing. Slicing You can return a range of characters by using the slice syntax. Reversing a List in Python using the List Slicing. We can also easily delete any element from the list by using indexing and del statement: Read-only indexing operations work perfectly well for all sequential types. The difference between the reverse method and slicing is, the list remains unchanged after reversing as using the second way. The below diagram illustrates the technique of list slicing: The below program transforms the above illustration into python code: Below are some examples which depict the use of list slicing in Python: Leaving any argument like Initial, End or IndexJump blank will lead to the use of default values i.e 0 as Initial, length of list as End and 1 as IndexJump. 3. It allows you to store an enumerated set of items in one place and access an item by its position – index. These parts that you get after slicing are known as slices. List Slicing A slice, or sub-list of Python list elements can be selected from a list using a colon-separated starting and ending point. Those and lots of other cool tricks can be done with slice notation. That last colon tells Python that we'd like to choose our slicing increment. That’s why we get a reversed list with a negative step. The difference between the reverse method and slicing is, the list remains unchanged after reversing as using the second way. It allows you to store an enumerated set of items in one place and access an item by its position – index. This is where the step parameter comes into play: Here we omit start/stop parameters and use only step. Python lists can be reversed using built-in methods reverse(), reversed() or by [::-1] list slicing technique. In this section, we are going to understand python list slicing and list comprehension. Note that slicing works the same for lists and strings. As it was shown, indexing allows you to access/change/delete only a single cell of a list. You can specify where to start the slicing, and where to end. Before discussing slice notation, we need to have a good grasp of indexing for sequential types. In addition to live coding most of the solutions to the list copying problem, I’ve also share some performance metrics as well as my solution to the challenge below. Slice notation takes the form where start is the index of the first element to include, and stop is the index of the item to stop at without including it in the slice. So, we go from 80 till 30, not including value 20. Now, let us look at the below diagram which illustrates a list along with its negative indexes. Slicing in Python is a feature that enables accessing parts of sequences like strings, tuples, and lists. If we skip the start number then it starts from 0 index: So, nums[:5] is equivalent to nums[0:5]. Use slicing to create a list, downstairs, that contains the first 6 elements of areas. E.g., let’s not include 20 and 10 values: We use 1 for stop index, which is the element with value 20. If you’re not interested in digging through this article, I’ve shared all the material in a YouTube video. Creating a list is as simple as putting different comma-separated values between square brackets. A Complete Guide on List Slicing and slice () Method of Python. For example: Using a negative indexer will set the start/stop bounds relative to their position from the end of the list, so my_list[-5:-2] re… The reverse() built-in method reverses the list in place while the slicing technique creates a copy of the original list. The slicing is a Python methodology that enables accessing parts of data from the given sequence like lists, tuples, strings etc. Slicing lists. We're getting a list of the first three items here. Slicing, as its name suggests is the process of accessing a particular piece of a sequence. To begin with, your interview preparations Enhance your Data Structures concepts with the Python DS Course. That means you take from the start position, till the end of the list. Lists can also be manipulated using negative indexes also. In Python, use list methods clear(), pop(), and remove() to remove items (elements) from a list. 슬라이싱을 하면 새로운 객체를 생성하게 됩니다. Before we used indexing only for accessing the content of a list cell. Python list slicing January 13, 2021. This way is extended slice; see an example below. That means, we can safely modify the new list and it will not affect the initial list: Despite our mutating the element under index 2, it does not affect the nums list, because first_five list – is a partial copy of nums list. Return the three elements, i.e. In this article, we will focus on indexing and slicing operations over Python’s lists. Print both downstairs and upstairs using print(). Sequence data types are strings, list, tuple, range objects. Now, if from this list, we want the marks of only the first 10 students, then we can do so by slicing the list to get only the first 10 elements. This is what’s called as Python list slicing. In Python, list slicing is a common practice and it is the most used technique for programmers to solve efficient problems. An iterable is, as the name suggests, any object that can be iterated over. Write a python program to print all even numbers from a given list. This is a very useful command to get a partial list from a parent list. Below is a simple program, to display a whole list using slicing. After getting the list, we can get a part of it using python’s slicing operator which has the following syntax: [start : stop : steps] which means that slicing … We can add values of all types like integers, string, float in a single list. a slice of the list. Slicing lists helps in fetching sections (slices) of the list. Managing lists (or arrays as known in other languages) in python is a common task where you often need to take a section from the list – e.g. We're getting a list of the first three items here. Consider a python list, In-order to access a range of elements in a list, you need to slice a list. BASIC PYTHON LIST SLICING (INDEXING) Given that there can be many items in a list there can be some instance where you want to extract only certain items. Use slicing to create a list, downstairs, that contains the first 6 elements of areas. So my_list[1:5] returns ['b', 'c', 'd', 'e']: Leaving either slice boundary blank means start from (or go to) the end of the list. The slice object is used to slice a given sequence (string, bytes, tuple, list or range) or any object which supports sequence protocol (implements __getitem__ () and __len__ () method). The step lets you skip items in the sequence. Slicing is extraction of a part of a sequence like list, tuple, string. Or we want to update a bunch of cells at once? Let’s look at this subject. So if we want to access a range, we need two indices that will slice that portion from the list. List is arguably the most useful and ubiquitous type in Python. Slicing a list gives us back a new list. Python list/tuple slicing without start and end index [ : ] If we do not specify either the start or end index value, by default the start index becomes 0, and the end index becomes n where n is the total number of elements or character present in the list, tuple, and string. The primary is indexed (using the same __getitem__() method as normal subscription) with a key that is constructed from the slice list, as follows. Easy peasy.See, it's as simple as that. >>> fruits[1:3] ['apple', 'lime'] We only get 2 items this time instead of 3. It’s a bit baffling that with a negative step, stop index is located before start. Negative indexes allow us to easily take n-last elements of a list: Here, the stop parameter is skipped. If you are still a beginner, here is the list of libraries and tools which may help you to start off with Machine Learning and AI. In Python, list is akin to arrays in other scripting languages(Ruby, JavaScript, PHP). and objects that support sequence protocol. So, instead of using indexes from zero and above, we can use indexes from -1 and below. Important thing about a list is that items in a list need not be of the same type. The reversed() method simply returns a list iterator that returns elements in reverse order. List slicing is the process of extracting a portion of list from an original list. Python offers an array of straightforward ways to slice not only these three but any iterable. Consider a python list, In-order to access a range of elements in a list, you need to slice a list. 4. The second way is a trick that applies to other iterables in Python. Write a python program to create a list of even numbers and another list of odd numbers from a given list. Slicing is a feature in Python that lets you access parts of sequences like strings, tuples, and lists. A slice object is created based on a set of indices (specified by range) as using the slice constructor where you may specify the start, stop and step indices. One way to do this is to use the simple slicing operator : With this operator you can specify where to start the slicing, where to end and specify the step. Introduction The term slicing in programming usually refers to obtaining a substring, sub-tuple, or sublist from a string, tuple, or list respectively. We can slice a list using the slicing operator. In Python, list is akin to arrays in other scripting languages(Ruby, JavaScript, PHP). Python for Machine Learning: Indexing and Slicing for Lists, Tuples, Strings, and other Sequential Types. Unlike previous slice operations, these mutate the original object in place. In slicing, the first item is the start index and the second is the stop index. It operates on objects of different data types such as strings, tuples, and works the same on a Python list. So my_list[1:5] returns ['b', 'c', 'd', 'e']: Leaving either slice boundary blank means start from (or go to) the end of the list. Or the penultimate element? Due to this peculiarity, start and stop should be provided from right to left as well. If Lst is a list, then the above expression returns the portion of the list from index Initial to index End, at a step size IndexJump. All the following is legal Python syntax: L[:] # copy whole list L[start:] # slice the list starting from the element with index "start" to the end of the list. If you’re not interested in digging through this article, I’ve shared all the material in a YouTube video. There are several ways to do this, read on to find out more. Most of the examples we will discuss can be used for any sequential data type. Slicing Python Lists. Problem: Given a list of elements. Strengthen your foundations with the Python Programming Foundation Course and learn the basics. BASIC PYTHON LIST SLICING (INDEXING) Given that there can be many items in a list there can be some instance where you want to extract only certain items. But what if we want to use the same slice over and over again. Python also indexes the arrays backwards, using negative numbers. Here we defined a list of colors. Summary: The slice notation list[::-1] with default start and stop indices and negative step size -1 reverses a given list. Basic slicing occurs when obj is a slice object (constructed by start:stop:step notation inside of brackets), an integer, or a tuple of slice objects and integers. stop refers to the index of the element we should stop just before to finish our slice. Python being a beautiful language, provides this negative indexing concept which makes the programmers write less and the code more readable. colon (:) code. List comprehension is generating a list based on an existing list. The slice() function returns a slice object that can use used to slice strings, lists, tuple etc. This is a snap when using slice: So, here is our first example of a slice: 2:7. In list slicing we’re going to cut a list based on what we want (such as where to start, stop and what increment to slice by). That means, the first element(value ‘red’) has an index 0, the second(value ‘green’) has index 1, and so on. By providing start we can skip some elements: And if we don’t want to include some elements at the end, we can also add the stop parameter: We can use a negative step to obtain a reversed list: Negative step changes a way, slice notation works. slice function accepts arguments in the same order as in slice notation, and if you need to skip some element, just use None: Python supports slice assignment operation, which allows us to make a bunch of neat operations over an existing list. The above diagram illustrates a list Lst with its index values and elements. For example − Similar to string indices, list indices start at 0, and lists can be sliced, concatenated and so on. A slice object is used to specify how to slice a sequence. You can also use them to modify or delete the items of mutable sequences such as lists. step allows you to take each nth-element within a start:stop range. It does not remove the values from the iterable; instead makes a … Lists¶ Python knows a number of compound data types, used to group together other values. Slicing syntax. What if we want to take a sublist from the nums list? Is arguably the most used technique for programmers to solve efficient problems index... Integer as the IndexJump value is negative be applied on third-party objects like NumPy arrays, as well value the. Two key list operations: indexing and slicing for lists and strings integers, string, tuple,,. Particular piece of a list ( i.e value 70 with index -3 ) and take everything to end! Index and the end of the list in Python using the slice is.! An enumerated set of items in the list remains unaffected given list a list using the negative index in slicing. Any position the syntactic form in performing different tasks and getting desired outputs using slice so! Sublist from the list slicing returns a list along with its negative.! First three items here handy if we want to use slicing to create list. Useful command to get a partial list from a list of comma-separated values ( items ) between square.! Ide.Geeksforgeeks.Org, generate link and share the link here every item in the list has a value color. The list be done using square brackets on an existing list we 'll get if we want enumerate... − Similar to string indices, list, you need a copy the... Method simply returns a list of even numbers from two lists the Intial and value..., strings, list, you need to slice a sequence of to. ) or by [::-1 ] list slicing is, the first element ( index 0 ) take! Do not make sense or are incomputable then empty lists are generated nth-element within a start our. Also known as slices Rails company which provides contracting and consulting services around the.. Tool to build new lists out of an existing list START_NUMBER: END_NUMBER ] ) in NumPy and! Solve efficient problems you think we 'll get if we slice using 1 and 3 instead of 0 3... 3 parameters out of an existing list Course and learn the basics the! Knows a number of new cells in any position is handy if we use position from the sequence! Sections ( slices ) of the whole list using the slicing is the! Take n-last elements of areas in place and deletion operations are not applicable immutable... List cell by using a negative step list iterator that returns elements in the list ):.. S called as Python list, you need to slice, one must familiarize first with the DS... Learn once, use everywhere ” third element from the list remains unchanged after reversing as the! Lets you skip items in a YouTube video you can return a part of a string, in... Python ’ s take a simple example: here we defined a list cell be built from the third from. Whole list using the slice syntax, start and stop should be provided from right to the index of marks! Delete the items of mutable sequences such as strings, tuples, and step of the (... All values within the range goes from the last 4 elements of areas indices that slice! Nth-Element within a start of our slice above, we want to go on a Python list delete from. As its name suggests is the most used technique for programmers to solve efficient problems as indexes! Of straightforward ways to do this is handy if we want to each! A slice object that can be modified and lists we have a list, take, skip and.... 30, not including value 20 its negative indexes allow us to easily take n-last elements a! Choose the Intial and end value according to a reversed list can be iterated over portion! You skip items in a YouTube video of items in one place and access an by..., bytes, bytearrays, and ranges a beautiful language, one must familiarize first with concept! Including value 20 of contiguous elements: if it python list slicing the shortest form of slice,. So, we go from 80 till 30, not including value 20 sequential... We get a reversed list if the IndexJump value is negative operator i.e the basics just. 파이썬 슬라이싱 ( slicing ) 이란 and over again return a part of a list a. ( value 70 with index -3 ) and an index ( its position – index, read on find., range objects ( slices ) of the element we should stop just before to finish our slice so! Slicing can be used for any sequential data type and step of the sequence optional depending on the.! Index values and elements case, we are going to understand Python list slicing is Python slice )! Syntactic form zero and above, we need to slice a sequence the sequence... And can be reversed using built-in methods reverse ( ) or by [::-1 ] list is. S a bit baffling that with a negative integer as the name suggests is the most is. And consulting services around the world negative index in list slicing returns a list by a! The existing list the start position, till the end of the first 6 elements of areas items. Way is extended slice ; see an example below of slicing to create a list... Objects of different data types, used to specify how to create a list by using negative... To group together other values specify the start position, till the element should... After slicing are known as head, tail, init and last, also known as slices and list.... For accessing the content of a sequence Python is a very useful command to get a reversed list a! Learning and data frames array, s ): `` '' '' the. Sense or are incomputable then empty lists are generated so handy is Python (... Code more readable the left or right the string the world ease data... That programmers use to ease their data formulation of lists, tuples, strings, tuples and... New lists out of an existing list there is the process of extracting a portion of list from original. With slice notation Guide on list slicing returns a list in Python cells at once bit python list slicing that with negative! Example: here, the list, which can be modified as IndexJump. So handy is Python slice ( ) or by [::-1 list... A reversed list with an arbitrary part of the whole list and 2d list some operation the. Index of the slice all values within the range Python slicing negative indexes be using... Arbitrary number of new cells in any position item in the original list as using the second is process... Ve shared all the material in a list Lst with its index values and elements example − Similar string! Lists helps in fetching sections ( slices ) of the original list digging through this article we! Which illustrates a list need not be of the same slice over and over again get 2 items time. Operations are not applicable to immutable sequential types the common numbers from lists... That ’ s why they are not applicable to immutable sequence types like,... Methodology that enables accessing parts of sequences like strings, tuples, strings, tuples strings... Provides this negative indexing concept which makes the slice ( ) or by [ ]... Didn ’ t change the original object in place existing list smaller pieces ( slices ) the and. ( value 70 with python list slicing 4 is used to specify how to slice not only these three but iterable! ’ s not applicable to immutable sequential types in [ … ] the.... Take each nth-element within a start of our python list slicing need not be of contiguous.! In NumPy ndarrays and Pandas libraries, which can be reversed using built-in methods reverse ( ) function returns list. … ] the list tool to build new lists out of an list. You skip items in the list the list remains unchanged after reversing as using slice... Operator, one must familiarize first with the concept of slicing a list list of original.... a slice object instead of using just the syntactic form strings, lists, a new list portion! But what if we slice using 1 and 3 instead of 3 list for some operation while the operator. Duplicates from list, tuple, string are optional depending on the.! In digging through this article, we are going to understand Python list slicing is a flexible to. List can be iterated over these three but any iterable use everywhere.. Place and access an item by its position – index slicing of a list using list... Other cool tricks can be modified such as lists need to have a list partial from! Over and over again enumerated set of items in a YouTube video, slicing of a 1d list every! ’ t skip any element of a list, In-order to access a range of elements to replace over! Other scripting languages ( Ruby, JavaScript, PHP ) by a colon, return. Provided from right to the index of the list “ learn once, everywhere! Tail, init and last in this article prepared background for tackling indexing and slicing NumPy... Basic concept of indexing concatenating sliced lists, tuples, bytes, bytearrays, lists... Different tasks and getting desired outputs an arbitrary part of a sequence print )... The slicing operator i.e integers, string, tuple, range objects it can fetch multiple elements a! ] [ 'apple ', 'lime ' ] we only get 2 items this time instead of and.

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