python中的`else`在for、while、try 语句的使用方法

for ... else ...

当for 循环执行完时, 且该for 循环没有被 break语句终止，才运行 else语句

Eg:

for i in range(1, 5):
    if i == 4:
        print("Not break")
else:
    print("Run else")

"""输出 
Not break
Run else
"""

for i in range(1, 5):
    if i == 4:
        print("break")
        break
else:
    print("Run else")
  
"""输出 
Not break
"""

while ... else ...

与for循环类似；当while循环执行完时，且未被break语句终止，才运行else语句

Eg:

i = 0
while i <= 5:
    i += 1
    if i == 4:
        print("Not break")
else:
    print("Run else")
    
"""输出 
Not break
Run else
"""

i = 0
while i <= 5:
    i += 1
    if i == 4:
        print("break")
        break
else:
    print("Run else")
    
"""输出 
break
"""

try ... else ...

当 try 语句块中没有异常抛出时，才运行else语句，else语句抛出的异常不会由前面的except语句处理。

(～﹃～)~zZ

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