merge two columns pandas

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Valeria
19 May 2020
1df["period"] = df["Year"].astype(str) + df["quarter"]
2
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Angelo
25 Jun 2017
1df_outer = pd.merge(df1, df2, on='id', how='outer') #here id is common column
2
3df_outer
4
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Charlene
18 May 2018
1df_3 = pd.concat([df_1, df_2])
2
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Ulysse
11 Jan 2017
1df['A'] = df[a_cols].apply(' '.join, axis=1)
Sandro
05 Nov 2018
1#suppose you have two dataframes df1 and df2, and 
2#you need to merge them along the column id
3df_merge_col = pd.merge(df1, df2, on='id')
Amelia
06 Jan 2017
1df["period"] = df["Year"] + df["quarter"]
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