http://www.cnblogs.com/kaituorensheng/archive/2013/01/24/2875456.html
d={'a':1,'b':2,'c':3}
for i in d.keys():
print(i,d[i])
http://www.cnblogs.com/kaituorensheng/archive/2013/01/24/2875456.html
d={'a':1,'b':2,'c':3}
for i in d.keys():
print(i,d[i])
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