[英]Pandas: Combine two dataframes and expand rows dynamically
I've got the following dataframes setup我有以下数据框设置
A一种
[ClaimantId], [ClaimId], [LenderId], [IsWorked] 1 1 1 1 1 2 4 0 1 3 3 1 2 6 1 1
B乙
[ClaimantId], [Forename], [Surname]
1 Bruce Wayne
2 Peter Parker
My Desired output would be我想要的输出是
[ClaimantId], [Forename], [Surname], [C1], [C2], [C3], [L1], [L2], [L3], [W1], [W2], [W3]
1 Bruce Wayne 1 2 3 1 4 3 1 0 1
2 Peter Parker 6 Nan Nan 1 Nan Nan 1 Nan Nan
I'm not sure what i can apply to this, the number of C/L/W columns has an upper limit of 20 and won't ever be exceeded.我不确定我可以对此应用什么,C/L/W 列的数量上限为 20,并且永远不会超过。
I'd really appreciate any help.我真的很感激任何帮助。
Thanks,谢谢,
Use:用:
d = {'ClaimId':'C', 'LenderId':'L','IsWorked':'W'}
df = (A.rename(columns=d)
.set_index(['ClaimantId',A.groupby('ClaimantId').cumcount()])
.unstack())
df.columns = [f'{i}{j+1}' for i, j in df.columns]
print (df)
C1 C2 C3 L1 L2 L3 W1 W2 W3
ClaimantId
1 1.0 2.0 3.0 1.0 4.0 3.0 1.0 0.0 1.0
2 6.0 NaN NaN 1.0 NaN NaN 1.0 NaN NaN
df1 = B.join(df, on='ClaimantId')
print (df1)
ClaimantId Forename Surname C1 C2 C3 L1 L2 L3 W1 W2 \
0 1 Bruce Wayne 1.0 2.0 3.0 1.0 4.0 3.0 1.0 0.0
1 2 Peter Parker 6.0 NaN NaN 1.0 NaN NaN 1.0 NaN
W3
0 1.0
1 NaN
Explanation :说明:
rename
columns by dict首先按字典rename
列set_index
by counter Series
created by cumcount
然后set_index
by counter Series
创建的cumcount
unstack
通过unstack
重塑list comprehension
with f-string
s通过使用f-string
s 的list comprehension
平 MultiIndex 列join
second DataFrame
最后join
第二个DataFrame
EDIT:编辑:
If need same length all columns use reindex
by new MultiIndex
created by range
:如果需要相同长度的所有列使用reindex
通过新的MultiIndex
创建的range
:
d = {'ClaimId':'C', 'LenderId':'L','IsWorked':'W'}
df = (A.rename(columns=d)
.set_index(['ClaimantId',A.groupby('ClaimantId').cumcount()])
.unstack())
mux = pd.MultiIndex.from_product([df.columns.get_level_values(0).unique(), range(5)])
df = df.reindex(columns=mux, fill_value=0)
df.columns = [f'{i}{j+1}' for i, j in df.columns]
print (df)
C1 C2 C3 C4 C5 L1 L2 L3 L4 L5 W1 W2 W3 W4 \
ClaimantId
1 1.0 2.0 3.0 0 0 1.0 4.0 3.0 0 0 1.0 0.0 1.0 0
2 6.0 NaN NaN 0 0 1.0 NaN NaN 0 0 1.0 NaN NaN 0
W5
ClaimantId
1 0
2 0
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