I have the following pandas DataFrame
:
id quantity cost type
2016-06-18 1700057817 2 2383 A
2016-06-18 1700057817 1 744 B
2016-06-19 1700057817 5 934 A
Here, the dates are the index
. I need the table to be pivoted like this:
id A-quantity A-cost B-quantity B-cost
2016-06-18 1700057817 2 2383 1 744
2016-06-19 1700057817 5 934 NA NA
What I've tried so far:
I've tried many usages of pivot
. This is as close as I've gotten:
>>> df.pivot(index='id', columns='type')
quantity cost
type A B A B
id
1700057817 2 1 2383 744
Problems with this:
date
index is gone date
- id
combination I've also gone through several articles on SO and elsewhere, including this one .
You could set_index
with append=True
followed by unstack
and keep the MultiIndex
:
df.set_index(['id', 'type'], append=True).unstack()
Or forcibly reformat to what you asked for:
# step-one same as above
df1 = df.set_index(['id', 'type'], append=True).unstack()
# collapse MultiIndex columns into '-' separated string
df1.columns = df1.columns.swaplevel(0, 1).to_series().str.join('-')
# move 'Id' from the index back into dataframe proper
df1 = df1.reset_index(1)
df1
You can use reset_index
to preserve dates.
df.index.name = 'date'
df = df.reset_index().pivot_table(index=['date', 'id'], columns=['type'])
df = df.sort_index(axis=1, level=1)
df.columns = ['-'.join(tup[::-1]) for tup in df.columns]
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