轴别名(Aliasing Axis Names)

To globally provide aliases for axis names, one can define these 2 functions:

  1. In [189]: def set_axis_alias(cls, axis, alias):
  2.    .....:    if axis not in cls._AXIS_NUMBERS:
  3.    .....:       raise Exception("invalid axis [%s] for alias [%s]" % (axis, alias))
  4.    .....:    cls._AXIS_ALIASES[alias] = axis
  5.    .....:
  1. In [190]: def clear_axis_alias(cls, axis, alias):
  2.    .....:    if axis not in cls._AXIS_NUMBERS:
  3.    .....:       raise Exception("invalid axis [%s] for alias [%s]" % (axis, alias))
  4.    .....:    cls._AXIS_ALIASES.pop(alias,None)
  5.    .....:
  1. In [191]: set_axis_alias(pd.DataFrame,'columns', 'myaxis2')
  3. In [192]: df2 = pd.DataFrame(np.random.randn(3,2),columns=['c1','c2'],index=['i1','i2','i3'])
  5. In [193]: df2.sum(axis='myaxis2')
  6. Out[193]: 
  7. i1    0.745167
  8. i2   -0.176251
  9. i3    0.014354
  10. dtype: float64
  12. In [194]: clear_axis_alias(pd.DataFrame,'columns', 'myaxis2')