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Python: next() function

next() function

The next() function is used to get the next item in an iterator.

Version:

(Python 3.2.5)

Syntax:

next(iterator[, default])

Parameter:

Name Description Required /
Optional
iterator An iterable object. Required
default This value is returned if the iterator is exhausted (no items left). Optional

Return value:

Returns the next item of the iterator.

Example: Python next() function

items = [7, 15, 'Python']

# converting list to iterator
itemsIterator = iter(items)
print(itemsIterator)

# Output: 7
print(next(itemsIterator))

# Output: 15
print(next(itemsIterator))

# Output: 'Python'
print(next(itemsIterator))

Output:

<list_iterator object at 0x7f8b758a8470>
7
15
Python

Pictorial Presentation:

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

Pictorial Presentation:

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

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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