List () function in Python

List () creates a list in Python. So what is the syntax of list () function, what parameters does it have and how to use it? Invites you to read the track.

The syntax of list () function in Python

 list([iterable]) 

Parameter of list function ()

The list () list creation function in Python has a unique parameter:

1. iterable : an object can be string, tuple, set, dictionary or iterator iterative object

The value returned from the list

1. If the parameter is not passed, list () will create an empty list
2. If iterable is passed as a parameter, it creates a list of iterable elements

Example 1: Create list from string, tuple, list

 # danh sách trống 
 print(list()) 
 
 # chuỗi nguyên âm 
 nguyenamString = 'aeiou' 
 print(list(nguyenamString)) 
 
 # tuple nguyên âm 
 # viết bởi TipsMake.com 
 nguyenamTuple = ('a', 'e', 'i', 'o', 'u') 
 print(list(nguyenamTuple)) 
 
 # danh sách nguyên âm 
 nguyenamList = ['a', 'e', 'i', 'o', 'u'] 
 print(list(nguyenamList)) 

Run the program, the result is:

 [] 
 ['a', 'e', 'i', 'o', 'u'] 
 ['a', 'e', 'i', 'o', 'u'] 
 ['a', 'e', 'i', 'o', 'u'] 

Example 2: Create list of words set, dictionary

 # set nguyên âm 
 nguyenamSet = {'a', 'e', 'i', 'o', 'u'} 
 print(list(nguyenamSet)) 
 
 # dictionary nguyên âm 
 nguyenamDictionary = {'a': 1, 'e': 2, 'i': 3, 'o':4, 'u':5} 
 print(list(nguyenamDictionary)) 

Running the program results in:

 ['e', 'o', 'a', 'i', 'u'] 
 ['e', 'o', 'u', 'a', 'i'] 

Example 3: Create list from iterator object

 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)) 

Running the program results in:

 [1, 2, 4, 8, 16] 
 

See also: Built-in Python functions