slice columns from dataframe
# select specific columns with a list
# select columns foo, bar and dat
df.loc[:, ['foo','bar','dat']]slice columns from dataframe
# select specific columns with a list
# select columns foo, bar and dat
df.loc[:, ['foo','bar','dat']]add an index column in range dataframe
df = df.loc[df.index.repeat(df['a'])]
df['c'] = df.groupby(level=0).cumcount() + 1
df = df.reset_index(drop=True)
print (df)
a b c
0 1 x 1
1 2 y 1
2 2 y 2
3 3 z 1
4 3 z 2
5 3 z 3Copyright © 2021 Codeinu
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