Python random module (obtain random Number) common methods and Examples

Random. random
Random. random () is used to generate a random number of points 0 to 1: 0 <= n <1.0

Random. uniform
Random. uniform (a, B) is used to generate a random number of characters in a specified range. One of the two parameters is the upper limit and the other is the lower limit. If a> B, the random number n: a <= n <= B. If a <B, B <= n <=
Copy codeThe Code is as follows:
Print random. uniform (10, 20)
Print random. uniform (20, 10)
#18.7356606526
#12.5798298022

Random. randint
Random. randint (a, B) is used to generate an integer in the specified range. Where parameter a is the lower limit, parameter B is the upper limit, and the generated random number n: a <= n <= B
Copy codeThe Code is as follows:
Print random. randint (12, 20) # generated random number n: 12 <= n <= 20
Print random. randint (20, 20) # The result is always 20
# Print random. randint (20, 10) # This statement is incorrect. The lower limit must be less than the upper limit.

Random. randrange
Random. randrange ([start], stop [, step]), obtains a random number from the set that increments by the specified base number within the specified range. For example: random. randrange (10,100, 2), the result is equivalent to obtaining a random number from the [10, 12, 14, 16,... 96, 98] sequence. Random. randrange (10,100, 2) is equivalent to random. choice (range (10,100, 2 ).

Random. choice
Random. choice gets a random element from the sequence. The function prototype is random. choice (sequence ). The sequence parameter indicates an ordered type. Sequence is not a specific type in python, but a series of types. List, tuple, and string all belong to sequence. For sequence, see the python manual data model chapter. The following are examples of using choice:
Copy codeThe Code is as follows:
Print random. choice ("Learning Python ")
Print random. choice (["JGood", "is", "a", "handsome", "boy"])
Print random. choice ("Tuple", "List", "Dict "))

Random. shuffle
Random. shuffle (x [, random]) is used to disrupt the elements in a list. For example:
Copy codeThe Code is as follows:
P = ["Python", "is", "powerful", "simple", "and so on..."]
Random. shuffle (p)
Print p
# ['Powerful', 'simple', 'is', 'python', 'and so on... ']

Random. sample
Random. sample (sequence, k), random get the specified length from the specified sequence. The sample function does not modify the original sequence.
Copy codeThe Code is as follows:
List = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
Slice = random. sample (list, 5) # randomly obtain 5 elements from the list and return them as a piece.
Print slice
Print list # The original sequence has not changed

Random INTEGER:
Copy codeThe Code is as follows: >>> import random
>>> Random. randint (0, 99)
#21

Randomly select an even number between 0 and 100:
Copy codeThe Code is as follows: >>> import random
>>> Random. randrange (0,101, 2)
#42

Random Floating Point Number:
Copy codeThe Code is as follows: >>> import random
>>> Random. random ()
0.85415370477785668
>>> Random. uniform (1, 10)
#5.4221167969800881

Random characters:
Copy codeThe Code is as follows: >>> import random
>>> Random. choice ('abcdefg & # % ^ * F ')
# 'D'

Select a specific number of characters from multiple characters:
Copy codeThe Code is as follows: >>> import random
Random. sample ('abcdefghj', 3)
# ['A', 'D', 'B']

Select a specific number of characters to form a new string:
Copy codeThe Code is as follows: >>> import random
>>> Import string
>>> String. join (random. sample (['A', 'B', 'C', 'D', 'E', 'E', 'F', 'G', 'h', 'I ', 'J'], 3 )). replace ("","")
# 'Fih'

Randomly selected string:
Copy codeThe Code is as follows: >>> import random
>>> Random. choice (['apple', 'pear ', 'peach', 'Orange ', 'lemon'])
# 'Limon'

Shuffling:

Copy codeThe Code is as follows: >>> import random
>>> Items = [1, 2, 3, 4, 5, 6]
>>> Random. shuffle (items)
>>> Items
# [3, 2, 5, 6, 4, 1]