pandas DataFrame添加列到索引而无需重置 [英] Pandas DataFrame Add column to index without resetting
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问题描述
如何将'd'
添加到下面的索引中而不必先将其重置?
how do I add 'd'
to the index below without having to reset it first?
from pandas import DataFrame
df = DataFrame( {'a': range(6), 'b': range(6), 'c': range(6)} )
df.set_index(['a','b'], inplace=True)
df['d'] = range(6)
# how do I set index to 'a b d' without having to reset it first?
df.reset_index(['a','b','d'], inplace=True)
df.set_index(['a','b','d'], inplace=True)
df
推荐答案
我们在set_index
中添加了append
选项.试试吧.
We added an append
option to set_index
. Try that.
命令是:
df.set_index(['d'], append=True)
(我们不需要指定['a','b'],因为它们已经在索引中,并且我们要附加到它们后面)
(we don't need to specify ['a', 'b'], as they already are in the index and we're appending to them)
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