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else 语句 ​

与 else 语句配合 ​

  • if-else 表示条件不成立时执行else
  • while-else 没有碰到break时，执行else
  • for-else 没有碰到break时，执行else

if-else 和 for-else ​

python
for _ in range(3):
    pwd = input("Pls enter your password：")
    if pwd == '123':
        print("correct password")
        break
    else:
        print("incorrect password")
else:
    print("too many times retry.")
    
# 运行结果如下： 
#
# Pls enter your password：111        # 输入错误 111
# incorrect password
# Pls enter your password：124        # 输入错误 124
# incorrect password
# Pls enter your password：111        # 输入错误 111
# incorrect password
# too many times retry.

while-else ​

python
i = 0
while i < 3:
    pwd = input("Pls enter your password：")
    if pwd == '123':
        print("correct password")
        break
    else:
        print("incorrect password")
    i += 1
else:
    print("too many times retry.")

# 运行结果如下：  
#
# Pls enter your password：111        # 输入错误 111
# incorrect password
# Pls enter your password：222        # 输入错误 222
# incorrect password
# Pls enter your password：333        # 输入错误 333
# incorrect password
# too many times retry.