【python小练】0001

第 0001 题：做为 Apple Store App 独立开发者，你要搞限时促销，为你的应用生成激活码（或者优惠券），使用 Python 如何生成 200 个激活码（或者优惠券）？

# coding = utf-8
__author__= 'liez'

import random

def make_number(num, length):
    str = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'
    a = []
    i = 0
    while i < num:
        numstr = ''
        for j in range(length):
            numstr += random.choice(str)
        if numstr not in a: #如果没重复
            a.append(numstr)
            i += 1
            print(numstr)

make_number(20,10)

note:

random.choice(seq): Return a random element from the non-empty sequence seq. If seq is empty,

这里先生成了20个：

COsSx9umWf
QKMSbDVj0G
ARdycodYAf
f8h0drSHJl
e0T6lF6aO1
ZB06xAlSnf
SmcAqxYHqm
209me2lsCl
NnvmMeMgqd
FqxLZVlzpC
dj7luHI53s
RytNv7yhTH
bg7PDFmGE1
I7r7S1mpWK
agN2PYF3TI
523YX6TdS8
GmffcmyoYX
MmZZ2pHieO
gaHTmOVPDT
6rgb3v2TJP

ps：

1.我是用random module的，也看到其他人很多不同的做法。比如用的uuid module，uuid-Universally unique identifier（通用唯一识别码）。

暂时不清楚这些序列生成函数间有什么区别(是不是哪个更安全之类的？)。uuid module docs

2.我用list来放生成的序列号，也看见用set的: A set object is an unordered collection of distinct hashable objects. Common uses include membership testing, removing duplicates from a sequence, and computing mathematical operations such as intersection, union, difference, and symmetric difference. 功能更多嘛。set types docs

具体改动：

def make_number(num, length):
    str = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'
    a = set()  //...
    i = 0
    while i < num:
        numstr = ''
        for j in range(length):
            numstr += random.choice(str)
        if numstr not in a: 
            a |= {numstr} //...
            i += 1
            print(numstr)

练习簿：https://github.com/Yixiaohan/show-me-the-code