Index
- built_in_functions
- Python abs()
- Python all()
- Python any()
- Python ascii()
- Python bin()
- Python bool()
- Python bytearray()
- Python bytes()
- Python callable()
- Python chr()
- Python classmethod()
- Python compile()
- Python complex()
- Python delattr()
- Python dict()
- Python dir()
- Python divmod()
- Python enumerate()
- Python eval()
- Python exec()
- Python filter()
- Python float()
- Python format()
- Python frozenset()
- Python getattr()
- Python globals()
- Python hasattr()
- Python hash()
- Python help()
- Python hex()
- Python id()
- Python input()
- Python int()
- Python isinstance()
- Python issubclass()
- Python iter()
- Python len()
- Python list()
- Python locals()
- Python map()
- Python max()
- Python memoryview()
- Python min()
- Python next()
- Python object()
- Python oct()
- Python open()
- Python ord()
- Python pow()
- Python print()
- Python property()
- Python range()
- Python repr()
- Python reversed()
- Python round()
- Python set()
- Python setattr()
- Python slice()
- Python sorted()
- Python staticmethod()
- Python str()
- Python sum()
- Python super()
- Python tuple() Function
- Python type()
- Python vars()
- Python zip()
- Python __import__()
- python1compute
- Python Program to Find Hash of File
- Python Program to Find the Size (Resolution) of a Image
- Python Program to Merge Mails
- Python Program to Count the Number of Each Vowel - Source Code: Using a list and a dictionary comprehension
- Python Program to Count the Number of Each Vowel - Source Code: Using Dictionary
- Python Program to Illustrate Different Set Operations
- Python Program to Sort Words in Alphabetic Order
- Python Program to Remove Punctuations From a String
- Python Program to Multiply Two Matrices - Matrix Multiplication Using Nested List Comprehension
- Python Program to Multiply Two Matrices - Source Code: Matrix Multiplication using Nested Loop
- Python Program to Transpose a Matrix - Matrix Transpose using Nested List Comprehension
- Python Program to Transpose a Matrix - Matrix Transpose using Nested Loop
- Python Program to Add Two Matrices - Source Code: Matrix Addition using Nested List Comprehension
- Python Program to Check Whether a String is Palindrome or Not
- Python Program to Add Two Matrices - Source code: Matrix Addition using Nested Loop
- Python Program to Convert Decimal to Binary Using Recursion
- Python Program to Find Factorial of Number Using Recursion
- Python Program to Find Sum of Natural Numbers Using Recursion
- Python Program to Display Fibonacci Sequence Using Recursion
- Python Program to Display Calendar
- Python Program to Shuffle Deck of Cards
- Python Program to Make a Simple Calculator
- Python Program to Find Factors of Number
- Python Program to Find LCM - Without using GCD function
- Python Program to Find HCF or GCD - Source Code: Using Euclidean Algorithm
- Python Program to Find LCM - Source Code: Using GCD function
- Python Program to Find HCF or GCD - Source Code: Using Loops
- Python Program to Find ASCII Value of Character
- Python Program to Convert Decimal to Binary, Octal and Hexadecimal
- Python Program to Find Numbers Divisible by Another Number
- Python Program To Display Powers of 2 Using Anonymous Function
- Python Program to Find the Sum of Natural Numbers
- Python Program to Find Armstrong Number in an Interval
- Python Program to Check Armstrong Number - Source Code: Check Armstrong number of n digits
- Python Program to Check Armstrong Number - Source Code: Check Armstrong number (for 3 digits)
- Python Program to Print the Fibonacci sequence
- Python Program to Display the multiplication Table
- Python Program to Find the Factorial of a Number
- Python Program to Print all Prime Numbers in an Interval
- Python Program to Find the Largest Among Three Numbers
- Python Program to Check Prime Number
- Python Program to Check Leap Year
- Python Program to Check if a Number is Odd or Even
- Python Program to Check if a Number is Positive, Negative or 0 Source Code: Using Nested if
- Python Program to Check if a Number is Positive, Negative or 0 Source Code: Using if...elif...else
- Python Program to Convert Celsius To Fahrenheit
- Python Program to Generate a Random Number
- Python Program to Convert Kilometers to Miles
- Python Program to Swap Two Variables Source Code: Without Using Temporary Variable
- Python Program to Swap Two Variables Source Code: Using temporary variable
- Python Program to Solve Quadratic Equation
- Python Program to Calculate the Area of a Triangle
- Python Program to Find the Square Root Source code: For real or complex numbers using cmath module
- Python Program to Find the Square Root Source Code: For positive numbers using exponent **
- Python Program to Add Two Numbers By One Line
- Python Program to Add Two Numbers Source Code: Add Two Numbers Provided by The User
- Python Program to Add Two Numbers
- Python Program to Print Hello world!
- python2based
Description list()
Python list() Function
The list() constructor creates a list in Python.
The syntax of list() constructor is:
list([iterable])
list() Parameters
Python list() constructor takes a single argument:
• iterable (Optional) - an object that could be a sequence (string, tuples) or collection (set, dictionary) or iterator object
Return value from list()
The list() constructor returns a mutable sequence list of elements.
• If no parameters are passed, it creates an empty list
• If iterable is passed as parameter, it creates a list of elements in the iterable
Example 1: Create list from sequence: string, tuple and list
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# empty list
print(list())
# vowel string
vowelString = 'aeiou'
print(list(vowelString))
# vowel tuple
vowelTuple = ('a', 'e', 'i', 'o', 'u')
print(list(vowelTuple))
# vowel list
vowelList = ['a', 'e', 'i', 'o', 'u']
print(list(vowelList))
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When you run the program, the output will be:
[]
['a', 'e', 'i', 'o', 'u']
['a', 'e', 'i', 'o', 'u']
['a', 'e', 'i', 'o', 'u']
Example 2: Create list from collection: set and dictionary
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# vowel set
vowelSet = {'a', 'e', 'i', 'o', 'u'}
print(list(vowelSet))
# vowel dictionary
vowelDictionary = {'a': 1, 'e': 2, 'i': 3, 'o':4, 'u':5}
print(list(vowelDictionary))
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When you run the program, the output will be:
['a', 'o', 'u', 'e', 'i']
['o', 'e', 'a', 'u', 'i']
Note: Keys in the dictionary are used as elements of the returned list. Also, the order in the list is not defined as a sequence.
Example 3: Create list from custom iterator object
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class PowTwo:
def __init__(self, max):
self.max = max
def __iter__(self):
self.num = 0
return self
def __next__(self):
if(self.num >= self.max):
raise StopIteration
result = 2 ** self.num
self.num += 1
return result
powTwo = PowTwo(5)
powTwoIter = iter(powTwo)
print(list(powTwoIter))
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When you run the program, the output will be:
[1, 2, 4, 8, 16]