python 判断字典是否为空

dict = {'name':'jack'}
dict_2={}
if dict:
    print 'pass'
else:print 'false'

if dict_2:
    print 'pass'
else:print 'false'

pass
false

判断列表和元组方法同理：

a=[]
b=()
if a:
    print 'pass'
else:print 'false'

if b:
    print 'pass'
else:print 'false'

false
false