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
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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")
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