1. Random functions in Python

This series does not give a detailed description of the Python syntax and theory, so it is not a learning material; A detailed study of the Vamei; is a good (basic-intermediate-Advanced) Learning tutorial. And here is just a summary of some of the topics that I learned about Python. 1. random () function

Description : The random() method returns a randomly generated real number that is within the range of [0,1].

Syntax:

Import randomrandom.random ();

Note: random ()is not directly accessible, you need to import the random module and then call the method through the random static object. Example Demo:

Import Random Print random.random (); Print random.random (); 0.451592468747

2. Randrange () function Description: randrange () method returns a random number in the specified increment cardinality collection, with a cardinality default of 1. Returns an integer

Grammar

Import Randomrandom.randrange ([Start,] stop [, step]) # Parameters:     Start- The starting value within the specified range, contained within the range      - The ending value within the specified range, not included in the range.      --Specify increment cardinality

Example Demo

print Random.randrange (ten); print random.randrange (5,10); print random.randrange (5,10,3); print random.randrange (5,10,3); 8

3.randint () function Description: Randint ()The Randrange method randomly generates an integer that is within the [x, Y] range and is somewhat equivalent to the x,y+1. Grammar

Import randomrandom.randint (x, y) # Parameters:     X-the start value within the specified range, contained within the range      -the end value within the specified range, contained within the range.

Example Demo

print random.randrange (5,10); print random.randint (5,10); 6

4. Uniform () function Description:uniform () Method will randomly generate the next real number, which is within [x, Y] range. Returns a floating-point number

Grammar:

Import randomrandom.uniform (x, y) # Parameters:     X-the start value within the specified range, contained within the range      -the end value within the specified range, contained within the range.

Example Demo

print random.uniform (5,10); print random.uniform (9,10); 9.95958315062

5. Choice () function Description: Choice ()method returns a list of the random items of a tuple or string.

Grammar

Import randomrandom.choice (x) # Parameters:     X--a kind of list,tuple,strings

Example Demo

print random.choice ('a','be', 5,'E  ')print random.choice ([10,2,6,5,85,'af' ])print random.choice ('I love python') v

6. Sample () function

Description: sample ()The method returns random items from a list, a tuple, or a string, and the return type is a tuple type

Grammar

Import randomrandom.sample (x,n) # Parameters:     X-- a kind     of list,tuple,strings --Returns n random items

Example Demo

>>>PrintRandom.sample ('I love Python', 3)[' ','e','I']>>>PrintRandom.sample ([10,20,50,23,'AB'],3)[50,'AB', 23]>>>PrintRandom.sample (10,20,50,23,'AB'), 3)[50, 20,'AB']

7. Shuffle () function

Description: The Shuffle () method randomly sorts all elements of a sequence. Similar to shuffling

Syntax:

Import randomrandom.shuffle (x) # Parameters:     X-one of the list,tuple; python2.x only supports list types

Example Demo

>>> list=['a','b','C','D','e'];>>>random.shuffle (list);>>>Printlist; ['C','D','a','e','b']

Expansion: reverse the meta-ancestor; the effect of implementing the reverse function

>>> list=['a','b','C','D','e'];>>> list1=list[::-1]>>>Printlist1['e','D','C','b','a']

1. Random functions in Python