Pandas Vectorized Methods

>>> from pandas import Series, DataFrame
>>> d = {'one': Series([1,2,3], index=['a','b','c']),
... 'two': Series([1,2,3,4], index=['a','b','c','d'])}
>>> df = DataFrame(d)
>>> df
   one  two
a  1.0    1
b  2.0    2
c  3.0    3
d  NaN    4
>>> import numpy
>>> df.apply(numpy.mean)
one    2.0
two    2.5
dtype: float64
>>> df['one'].map(lambda x: x>= 1)
a     True
b     True
c     True
d    False
Name: one, dtype: bool
>>> df.applymap(lambda x: x>= 1)
     one   two
a   True  True
b   True  True
c   True  True
d  False  True