Python random number

Premise: You need to import the random module

>>>import Random

1, Random.random

Random.random () is used to generate a random character from 0 to 1 decimals: 0 <= N < 1.0

>>> random.random () # random float x,

2, Random.uniform

The function prototype for Random.uniform is: Random.uniform (A, b), which is used to generate a random number of points within a specified range of two parameters, one of which is the upper limit and the other is the lower limit. If a > B, the generated random number n:a <= n <= B. If a <b, then B <= N <= A.

>>> Random.uniform (1, ten) # random float x,

3, Random.randint

The function prototype for Random.randint () is: Random.randint (A, b), which is used to generate integers in a specified range. Where parameter A is the lower limit, parameter B is the upper limit, the generated random number n:a <= n <= B

>>> Random.randint (10, 100)

4, Random.randrange

The function prototype for Random.randrange is: Random.randrange ([start], stop[, step]), which gets a random number from the specified range, in the collection incremented by the specified cardinality. such as: Random.randrange (10, 100, 2), the result is equivalent from [10, 12, 14, 16, ... 96, 98] gets a random number in the sequence. Random.randrange (10, 100, 2) is equivalent to Random.choice (range (10, 100, 2) on the result.

Randomly select even numbers between 0 and 100:
>>> Import Random
>>> random.randrange (0, 101, 2)

5, Random.choice

Random.choice gets a random element from the sequence. Its function prototype is: Random.choice (sequence). The parameter sequence represents an ordered type. Here's a note: sequence is not a specific type in Python, but a series of types. list, tuple, string all belong to sequence. For sequence, you can view the Python manual data Model chapter.

>>> random.choice (' abcdefg&#%^*f ') #随机字符
' d '

>>> random.choice ([' Apple ', ' pear ', ' peach ', ' orange ', ' Lemon ']) #随机选取字符串:
' Lemon '

6, Random.shuffle

The function prototype for random.shuffle is: random.shuffle (x[, Random]), which is used to disrupt elements in a list. Such as:

p = [' Python ', ' is ', ' powerful ', ' simple ', ' and so ' on ... ']
Random.shuffle (P)
Print P
#结果 (because it's random, so your results may be different.) ）
#[' powerful ', ' simple ', ' was ', ' Python ', ' and so on ... ']
p = [' Python ', ' is ', ' powerful ', ' simple ', ' and so ' on ... ']

7, Random.sample

The function prototype for random.sample is: random.sample (sequence, k), which randomly fetches fragments of the specified length from the specified sequence. The sample function does not modify the original sequence. If k is greater than the number of sequence elements, it will be reported

Python random number