python中for、while语句后的else代码块是怎样的

#今天学习下在#for或者while之后进行的#else操作#定义一个listmy_list = [1, 2, 3, 4, 5]for i in my_list:  print(i)else:  print('执行else模块')#当执行完for循环，会执行else代码块#打印结果为：#1#2#3#4#5#执行else模块#当我们打断for循环时，else就不会执行for i in my_list:  print(i)  if i == 3:    breakelse:  print('执行else模块')#结果为：#1#2#3#接下来的情况会执行else，#因为for没有被打断：for i in my_list:  print(i)  if i == 6:    breakelse:  print('执行else模块')#运行结果略!#while循环的例子：i = 1while i <=5:  print(i)  i += 1else:  print('执行while后的else语句') #使用break打断语句:i = 1while i <=5:  print(i)  i += 1  if i == 3:    breakelse:  print('执行while后的else语句')
#接下来看一个for...else的函数例子:def find_index(to_search,target):  for i,value in enumerate(to_search):    if value == target:      break  else:    return None  return i#定义一个list names = ['yale','tbag','test']index = find_index(names,'test')print('索引位置是:',index)#索引位置是: 2index_new = find_index(names,'John')print('索引位置是:',index_new)#索引位置是: None

12345执行else模块
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12345执行else模块
12345执行while后的else语句
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索引位置是: 2索引位置是: None