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Python: slice() function

slice() function

The slice() function is used to get a slice object representing the set of indices specified by range(start, stop, step).

Version:

(Python 3.2.5)

Syntax:

slice(stop)
slice(start, stop[, step])

Parameter:

Name Description Required /
Optional
start

An integer number specify where to start the slicing. Default is 0.

 Optional.
stop

An integer number specify where the slice will end.

 Required.
step

An integer number specify the step of the slicing. Default is .

 Optional.

Return value:

A slice object.

Example: Python slice()

pyStr = 'Python'

# contains indices (0, 1, 2, 3)
# i.e. P, y , t and h
sliceObj = slice(4)

print(pyStr[sliceObj])

# contains indices (1, 5)
# i.e. y and h
sliceObj = slice(1,5, 2)

print(pyStr[sliceObj])

Output:

Pyth
yh

Pictorial Presentation:

Python: Built-in-function - slice() function

Example: Python slice() with negative index

pyStr = 'Python'

# contains indices (-2, -3, -4)
# i.e. o, h and t
sliceObj = slice(-1, -3, -1)

print(pyStr[sliceObj])

Output:

no

Python Code Editor:

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Python: Tips of the Day

Find current directory and file's directory:

To get the full path to the directory a Python file is contained in, write this in that file:

import os 
dir_path = os.path.dirname(os.path.realpath(__file__))

(Note that the incantation above won't work if you've already used os.chdir() to change your current working directory, since the value of the __file__ constant is relative to the current working directory and is not changed by an os.chdir() call.)

To get the current working directory use

import os
cwd = os.getcwd()

Documentation references for the modules, constants and functions used above:

  • The os and os.path modules.
  • The __file__ constant
  • os.path.realpath(path) (returns "the canonical path of the specified filename, eliminating any symbolic links encountered in the path")
  • os.path.dirname(path) (returns "the directory name of pathname path")
  • os.getcwd() (returns "a string representing the current working directory")
  • os.chdir(path) ("change the current working directory to path")

Ref: https://bit.ly/3fy0R6m