add two column values of a datframe into one
df["period"] = df["Year"] + df["quarter"]add two column values of a datframe into one
df["period"] = df["Year"] + df["quarter"]add multiple columns to dataframe if not exist pandas
cols = ['B','C','D']
df = df.reindex(df.columns.union(cols, sort=False), axis=1, fill_value=0)
print (df)
A B C D
0 1 2 3 0
1 4 4 5 0
2 1 2 3 0
3 4 4 6 0Copyright © 2021 Codeinu
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