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Python: map() function

map() function

The map() function is used to execute a specified function for each item in a iterable.

Version:

(Python 3.2.5)

Syntax:

map(function, iterable, ...)

Parameter:

Name Description Required /
Optional
function Function to be executed. Required
iterable Collection or an iterator object Required

Note: If additional iterable arguments are passed, function must take that many arguments and is applied to the items from all iterables in parallel.

Example: Python map() function

def calSqrt(a):
  return a*a

num = (2, 3, 4, 8)
x = map(calSqrt, num)
print(x)

# converting map object to set
numSqrt = set(x)
print(numSqrt)

Output:

<map object at 0x7ff9bbf1f588>
{16, 9, 64, 4}

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