Python每日一谈｜No.9.循环中的一些关键词

 In [22]: a ='abcdefg'
    ...: for   i  in a:
    ...:            if i =='d':
    ...:                      print('find d and break')
    ...:                      break
    ...:           print('find',i)
    ...: print('finished')
find a
find b
find c
find d andbreak
finished

 # 当我们使用continue时

In [36]: a ='abcdefg'
    ...: print('continue') 
    ...: for i in a: 
    ...:     if i =='c': 
    ...:         continue
    ...:     print('find ',i) 
    ...:                                                                                                                                                   
continue
find  a
find  b
find  d
find  e
find  f
find  g
# 可以看出我们跳过了c进行了后续的循环


# 当我们使用break是
In [62]: print('break')
    ...: for i in a:
    ...:     if i =='c':
    ...:         break
    ...:     print('find ',i)
    ...:
break
find  a
find  b
# 可以看出当遇到break时，循环直接被打破
 

 In [63]: for i in a:
    ...:     if i =='c':
    ...:         pass
    ...:     print('find ',i)
    ...:
find  a
find  b
find  c
find  d
find  e
find  f
find  g
# 可以看出当我们使用pass时，实际上没有发生任何变化，程序会正常执行，循环

# 或者下面一个例子
In [38]: for i in a: 
    ...:     if i =='c': 
    ...:         pass
    ...:     else: 
    ...:         print(i,'is not c') 
# 当我们在使用pass时，程序不执行任何操作，但当条件不是‘c’时，程序执行print操作                                                                                                                                               
a isnot c
b isnot c
d isnot c
e isnot c
f isnot c
g isnot c