def fun(n):i=0while i<n:print("开始",i)yield ii+=1print("结束",i)
b=fun(5)
next(b)
next(b)输出：
开始 0结束 1
开始 1

先看一下传统的方法：
def fab(maxs):n,a,b = 0,0,1while n < maxs:print(b)a,b = b,a+bn = n + 1fib = fab(6)一次性输出：
1
2
3
5
8

加入生成器：
def fab(maxs):n,a,b = 0,0,1while n < maxs:yield b ##yield只能依次读取，不能从中间读取a,b = b,a+bn = n + 1fib = fab(6)
print(next(fib))
print(next(fib))
print(next(fib))
print(next(fib))
print(next(fib))

依次输出：11235

def range_powerfull(start,end,step):if isinstance(start,(int,float)) and isinstance(end,(int,float)):while start <end:startyield float(start)start+=stepelse:print('输入错误，开始和结束位置请输入整数或者浮点数')a = range_powerfull(0,1,0.1)
b = range_powerfull(3,10,0.75)
c = range_powerfull('c',5,0.23)for x in a:print(x)for y in b:print(y)输出：
0.0
0.1
0.2
0.30000000000000004
0.4
0.5
0.6
0.7
0.7999999999999999
0.8999999999999999
0.99999999999999993.0
3.75
4.5
5.25
6.0
6.75
7.5
8.25
9.0
9.75

可以通过for循环一次全部取出值，也可以通过next（）函数一个一个的取值。

import timedef run_time(func):def new_fun(*args):t0 = time.time()back = func(*args)times = time.time() - t0print('run time: %s' % (times))with open('log.txt', 'a+') as f:f.write('---%s\t' % (str(time.asctime(time.localtime()))))f.write('run time: %f\n' % (times))return back, timesreturn new_fun@run_time
def bu(x):for i in range(len(x)):for j in range(i,len(x)):if x[i]>=x[j]:x[i],x[j]=x[j],x[i]return xprint(bu([2,3,6,1,3,2,7]))

输出：([1, 2, 2, 3, 3, 6, 7], 0.0)并且追加写入log

str1='adhvahabcabcabcfjiaohgio'
str2='abc'str11='das3212345mn*1232123)'
str22='32123'def find_index(pattern,original):li = []for i in range(len(original)):if original[i]==pattern[0] and original[i:i+len(pattern)]==pattern:li.append(i)return liprint(find_index(str2,str1))
print(find_index(str22,str11))输出：

[6, 9, 12]
[3, 15]

import os, hashlibclass new_str(str): ##继承str就可以有字符串的全部方法def __init__(self, str1):self.str1 = str1def count(self):dic = {}for i in set(self):dic[i] = int(super().count(i))return dicrandstr = hashlib.sha1(os.urandom(32)).hexdigest()a = new_str(randstr)
print(a.count())

输出：{'a': 1, '3': 3, '4': 2, '9': 3, '6': 2, 'f': 2, '7': 6, 'd': 3, '8': 2, 'c': 5, '1': 2, '0': 4, '5': 2, '2': 3}