Python Module Learning: Random number generation

The random module in Python is used to generate a stochastic number. Here are some of the most commonly used functions in the random module.

Random.random

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

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:b <= n <= A. If a <b, then a <= n <= b.

Print random.uniform (+) Print Random.uniform #----results (different results on various machines) #18.7356606526#12.5798298022

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

Print Random.randint (  #生成的随机数n): <= n <= 20print random.randint (a)  #结果永远是20 #print Random.randint (  #该语句是错误的). The lower limit must be less than the upper limit.

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.

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, or refer to: http://www.17xie.com/read-37422.html. Here are some examples of using choice:

Print Random.choice ("Learn Python") print Random.choice (["Jgood", "is", "a", "handsome", "boy"]) print Random.choice (" Tuple "," List "," Dict "))

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#----results (results may differ on different machines.) #[' powerful ', ' simple ', ' was ', ' Python ', ' and so on ... ']

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.

list = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]slice = Random.sample (list, 5)  #从list中随机获取5个元素, as a fragment return to the print sliceprint list #原有 The sequence has not changed.

The above methods are the most common in the random module, and other methods are described in the Python manual. Interested friends can find more detailed information by querying the Python manual.

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