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Python: max() function

max() function

The max() function is used to find the item with the largest value in an iterable.

Version:

(Python 3.2.5)

Syntax:

max(iterable, *[, key, default])

Parameter:

Name Description Required /
Optional
iterable An iterable, with one or more items to compare. Required
key Specifies a one-argument ordering function like that used for list.sort(). Optional
default Specifies an object to return if the provided iterable is empty. If the iterable is empty and default is not provided, a ValueError is raised. Optional

Syntax:

max(arg1, arg2, *args[, key])

Parameter:

Name Description Required /
Optional
arg1, arg2, ..args If one positional argument is provided, iterable must be a non-empty iterable. The largest item in the iterable is returned. If two or more positional arguments are provided, the largest of the positional arguments is returned. Required
key Specifies a one-argument ordering function like that used for list.sort(). Optional

Return value:

The largest item in the iterable is returned.

Example-1: Python max() function

# using max(arg1, arg2, *args)
print('Maximum is:', max(2, 5, 3, 7, 6))

# using max(iterable)
num = [2, 3, 4, 10, 25, 15, 7]
print('Maximum is:', max(num))

Output:

Maximum is: 7
Maximum is: 25

Pictorial Presentation:

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

Pictorial Presentation:

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

Example-2: Python max() function

x = [25, 100, 1500, 725]
y = [10, 5]
z = [35, 525, 98]

# using max(iterable, *iterables, key)
print('Maximum is:', max(x, y, z, key=len))

Output:

Maximum is: [25, 100, 1500, 725]

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