Python generates random numbers, random string __python

Python produces random numbers, random strings




Import Random


#随机整数:
Print Random.randint (1,50)


#随机选取0到100间的偶数:
Print Random.randrange (0, 101, 2)


#随机浮点数:

Print Random.random ()
Print Random.uniform (1, 10)




#随机字符:
Print Random.choice (' abcdefghijklmnopqrstuvwxyz!@#$%^&* () ')




#多个字符中选取特定数量的字符:
Print random.sample (' ZYXWVUTSRQPONMLKJIHGFEDCBA ', 5)




#多个字符中选取特定数量的字符组成新字符串:
Prin '. Join (Random.sample) ([' Z ', ' y ', ' x ', ' W ', '] ' V ', ' u ', ') ' t ', ' s ', ' r ', ' Q ', ' P ', ' O ', ' n ', ' m ', ' l ', ' K ', ' j ', ' I ', ' h ', ' G ', ' F ' , ' e ', ' d ', ' C ', ' B ', ' A '], 5)




#随机选取字符串:
Print Random.choice ([' Scissors ', ' stone ', ' cloth '])




#打乱排序
Items = [1, 2, 3, 4, 5, 6, 7, 8, 9, 0]

Print Random.shuffle (items)

Here are four ways to implement Python string inversion:


1. Slices


def rev (s):


return S[::-1]


This is a slicing method, set the step to-1, which is the reverse sort.


This method is the most concise and most recommended.


2. This method is similar to slicing, but it is rather troublesome


def rev (s):


STR0 = "
L = Len (s)-1
While L >= 0:
STR0 + + s[l]
L-= 1
Return STR0





This method is to set a STR0 null variable first, then forward the value in S, then append to the STR0.


3. List


def rev (s):


A = List (s)
A.reverse ()
Return ". Join (a)


This method uses the reverse method of the list, first converts s to a list, then reverses it through the reverse method, and then joins the string through a join.


Note: Here, note the reverse and sort (or sorted) methods of the list:


Reverse is to sort the list direction;


Sort (reverse=true) is sorted in some order of direction.


Example


>>> a=[' A ', ' C ', ' B ', ' d ']
>>> b=[' A ', ' C ', ' B ', ' d ']
>>> A.sort (reverse=true)
>>> B.reverse ()
>>> A
[' d ', ' C ', ' B ', ' a ']
>>> b
[' d ', ' B ', ' C ', ' a ']


4. Reduce


def rev (s):


return reduce (lambda x, Y:y + x, s)