[英]Pandas: Combine two dataframes and expand rows dynamically
我有以下數據框設置
一種
[ClaimantId], [ClaimId], [LenderId], [IsWorked] 1 1 1 1 1 2 4 0 1 3 3 1 2 6 1 1
乙
[ClaimantId], [Forename], [Surname]
1 Bruce Wayne
2 Peter Parker
我想要的輸出是
[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
我不確定我可以對此應用什么,C/L/W 列的數量上限為 20,並且永遠不會超過。
我真的很感激任何幫助。
謝謝,
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
說明:
rename
列set_index
by counter Series
創建的cumcount
unstack
重塑f-string
s 的list comprehension
平 MultiIndex 列join
第二個DataFrame
編輯:
如果需要相同長度的所有列使用reindex
通過新的MultiIndex
創建的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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