The slice () function in Python

Continuing with the topic of built-in functions in Python, the article will introduce you to the slice () function with syntax, usage, and specific examples. Invites you to read the track.

The slice () function in Python returns a slice object. This object helps you determine how to cut an existing string (be it string, bytes, tuple, list, range) or objects that support string protocols (such as _getitem __ (), __len __ ()).

The syntax of the slice () function in Python:

 slice(stop) slice(start, stop, step)

The parameters of the slice () function

The slice () function can have up to 3 parameters:

start : An integer specifying the position to start cutting the object. The default is 0.
stop : An integer specifying the position where the object ends.
step : An integer that specifies the increment between cuts. The default value is 1.

If only one parameter is passed into the slice (), then start and step have no value.

The value returned from slice ()

The slice () function returns a slice object used to slice a string according to the corresponding indexes passed in the function.

Example 1: Create a slice object to cut

 # chứa các chỉ số (0, 1, 2) print(slice(3)) # chứa các chỉ số (1, 3) print(slice(1, 5, 2))

When you run the program, the output will be:

 slice(None, 3, None) slice(1, 5, 2)

Example 2: Receiving substring from a given string using slice object

 pyString = 'Python' # chứa các chỉ số (0, 1, 2) # vd P, y và t sObject = slice(3) print(pyString[sObject]) # chứa các chỉ số (1, 3) # vd y và h sObject = slice(1, 5, 2) print(pyString[sObject])

Return value:

 Pyt yh

Example 3: Get substring from a given string using negative index

 pyString = 'Python' # chứa các chỉ số (-1, -2, -3) # vd n, o và h sObject = slice(-1, -4, -1) print(pyString[sObject])

The output will be:

noh

Example 4: Slicing lists and tuples

 pyList = ['P', 'y', 't', 'h', 'o', 'n'] pyTuple = ('P', 'y', 't', 'h', 'o', 'n') # chứa các chỉ số (0, 1, 2) # vd P, y và t sObject = slice(3) # cắt list print(pyList[sObject]) # chứa các chỉ số (1, 3) # vd y và h sObject = slice(1, 5, 2) # cắt tuple print(pyTuple[sObject])

Results returned:

 ['P', 'y', 't'] ('y', 'h')

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