Python基础学习（3）

条件判断

单向判断：if

if xxxx:
    print(xxxx)

双向判断：if...else...

if xxxx:
    print(xxxx)
else:
    print(xxxx)

多向判断：if...else if...else...

elif 后面可不接else

if xxxx:
    print(xxxx)
elif xxxx:
    print(xxxx)
elif xxxx:
    print(xxxx)
else:
    print(xxxx)

if嵌套

if
    if
    else
else
    if
    else

if嵌套的执行顺序