This article describes the Python random random library to use Detailed, paper describes in great detail by the example code, a certain reference value of learning for all of us to learn or work, a friend in need can refer to the
Introduction
As we all know, python has extensive built-in library, also supports many third-party libraries, known as glue language, random library random, that comes with python standard library, his usage is too wide, in addition to generating relatively simple random number Outside , there are many features. Use random library:
import random
random library main function: 
When the random library most of the functions you use, you need to design a sequence. If every time we do not want to define, but simply to remove some of the random numbers, letters combination, then you need to use another standard library string: import string
a string library is mainly used inside string constants defined: 
Random use the library, for example:
1, the data file in random order (shuffle similar list, directly on the code, I believe could understand)
import random
#打开文件
f=open(r'F:\py\123.txt','r')
#读取文件信息，赋予一个变量
data=f.read()
#关闭文件
f.close()
print('数据:',data)
print('\n')
#data是一个字符串，我们以‘，'分隔成一个列表
s=data.split(',')
#随机排序
random.shuffle(s)
print(s)
Contents of the documents, you can also write a lot of lines, change what you can split a string when the above code. 
Operating results (can run several times more than look at the results):
Data: A, B, C, D, E, F., G, H, the I, J, K
[ 'the I', 'K', 'G', 'J', 'D', 'E', 'F. ',' C ',' a ',' B ',' H ']
2, using a simple random random red released.
import random
def red_packet(total,num):
for i in range(num-1):
per=random.uniform(0.01,total/2)
total=total- per
print('%.2f'%per)
else:
print('%.2f'%total)
red_packet(10,5)
Of course, to achieve the micro-letter envelopes like that is certainly much more complex, it involves algorithm, which only use the library to do a random example. operation result:
1.89
0.11
3.85
1.08
3.07
Similarly, more than a few times to try to run, it will be different.
3, string, and random combination of randomly generated verification code.
import random
import string
s=string.digits + string.ascii_letters
v=random.sample(s,4)
print(v)
print(''.join(v))
operation result:
['2', 'T', 'd', 'H']
2TdH
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than simply using the random library, there are many other uses, you can go to their own learning, and finally the introduction of a senior told me a the words: "Code this kind of thing, knock yourself again try to learn not only a cause, is lazy!!", we encourage each other.
