python 控制语句

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'

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

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