The shuffle() is an inbuilt method of the random module. It is used to shuffle a sequence (list). Shuffling a list of objects means changing the position of the elements of the sequence using Python.
Syntax of random.shuffle()
The order of the items in a sequence, such as a list, is rearranged using the shuffle() method. This function modifies the initial list rather than returning a new one.
Syntax: random.shuffle(sequence, function)
Parameters:
- sequence : can be a list
- function : optional and by default is random(). It should return a value between 0 and 1.
Returns: nothing
Python random.shuffle() function to shuffle list
Example 1:
Python3
# import the random module import random
# declare a list sample_list = [ 'A' , 'B' , 'C' , 'D' , 'E' ]
print ( "Original list : " )
print (sample_list)
# first shuffle random.shuffle(sample_list) print ( "\nAfter the first shuffle : " )
print (sample_list)
# second shuffle random.shuffle(sample_list) print ( "\nAfter the second shuffle : " )
print (sample_list)
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Output :
Original list : ['A', 'B', 'C', 'D', 'E'] After the first shuffle : ['A', 'B', 'E', 'C', 'D'] After the second shuffle : ['C', 'E', 'B', 'D', 'A']
The shuffle() method cannot be used to shuffle immutable DataTypes like strings.
Example 2:
Python3
# import the random module import random
# user defined function to shuffle def sample_function():
return 0.5
sample_list = [ 'A' , 'B' , 'C' , 'D' , 'E' ]
print ( "Original list : " )
print (sample_list)
# as sample_function returns the same value # each time, the order of shuffle will be the # same each time random.shuffle(sample_list, sample_function) print ( "\nAfter the first shuffle : " )
print (sample_list)
sample_list = [ 'A' , 'B' , 'C' , 'D' , 'E' ]
random.shuffle(sample_list, sample_function) print ( "\nAfter the second shuffle : " )
print (sample_list)
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Output :
Original list : ['A', 'B', 'C', 'D', 'E'] After the first shuffle : ['A', 'D', 'B', 'E', 'C'] After the second shuffle : ['A', 'D', 'B', 'E', 'C']
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