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data=pd.DataFrame([[2010,'auto'],[2010,'haha'],[2011,'haha'],[2012,'md']],columns=['year','type']) | |
data['typecnt']=np.ones(data.shape[0]) | |
data.groupby(['year','type'])['typecnt'].count() | |
输出 | |
year type | |
2010 auto 1 | |
haha 1 | |
2011 haha 1 | |
2012 md 1 |
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class num: | |
def __init__(self,v): | |
self.v=v | |
def double(self): | |
return self.v*2 | |
x=num(2) | |
bound=x.double |
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class MyType(type): | |
def __init__(cls, what, bases=None, dict=None): | |
print 'call myType.__init__()' | |
print "class name:"+what | |
print "class bases:"+str(bases) | |
print "class attributions:"+str(dict) | |
super(MyType,cls).__init__(what, bases, dict) | |
def __new__(cls, name, bases, attrs): | |
print "call MyType.__new__()" | |
return type.__new__(cls, name, bases, attrs) |
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