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python 控制语句

Jun 16, 2016 am 08:47 AM
pythoncontrol statement

1比如python提倡简单实用的思想,它就没有switch语句,如果要实现switch语句的效果
的话可以通过2个方法来写把
(1)通过if elif 语句来实现
if 条件:

elif 条件:

else:

(2)通过

复制代码 代码如下:

info = {}
info = {‘a':'1′,'b:2,'c:3,'default':ss'}
c = info.get(‘a',default')
2while语句有else语句
a = 2
while a > 1:
print ‘success'
else:
print ‘error'

当while循环条件变为False的时候,else块才被执行——这甚至也可能是在条件第一次被检验的时候。
3 for语句有else语句
复制代码 代码如下:

for i in xrange(5):
print i
else:
print ‘loop is end'

结果是 0 1 2 3 4 loop is end
记住,else部分是可选的。如果包含else,它总是在for循环结束后执行一次,
如果是遇到break语句,for 后面的else语句就不会执行了
复制代码 代码如下:

for i in xrange(5):
if i == 3:
print ‘success'
else:
print ‘loop is end'

结果是 success

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