Python: list() function
list() function
The list() function is used to create a list object (list is actually a mutable sequence type).
Read more about list from Python List and Python Exercises.
Version
(Python 3.2.5)
Syntax:
list([iterable])
Parameter:
Name | Description | Required / Optional |
---|---|---|
iterable | A sequence, collection or an iterator object. | Optional |
Example: Python list() function
# Example list
ExampleList = ['P', 'y', 't', 'h', 'o', 'n']
print(list(ExampleList))
Output:
['P', 'y', 't', 'h', 'o', 'n']
Pictorial Presentation:
Example: Python list() function with iterable
class PythonList:
def __init__(x, max):
x.max = max
def __iter__(x):
x.number = 0
return x
def __next__(x):
if(x.number >= x.max):
raise StopIteration
result = 3 ** x.number
x.number += 1
return result
PythonList = PythonList(7)
PythonListIter = iter(PythonList)
print(list(PythonListIter))
Output:
[1, 3, 9, 27, 81, 243, 729]
Python Code Editor:
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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")
Ref: https://bit.ly/3fy0R6m
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