df multiple columns into one column

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showing results for - "df multiple columns into one column"
Liam
17 Jan 2019
1df.stack().reset_index()
2
3   level_0   level_1  0
40        0  Column 1  A
51        0  Column 2  E
62        1  Column 1  B
73        1  Column 2  F
84        2  Column 1  C
95        2  Column 2  G
106        3  Column 1  D
117        3  Column 2  H
12
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