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pandas dataframe add two columns int and string

df = df['Day'].map(str) + '-' + df['Month'].map(str) + '-' + df['Year'].map(str)
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sum two columns pandas

sum_column = df["col1"] + df["col2"]
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add values of two columns pandas

df['sum'] = df['a'] + df['b']  # sum is a new column
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pandas dataframe add two columns int and string

df1 = df['1st Column Name'].map(str) + df['2nd Column Name'].map(str) + ...
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add values from 2 columns to one pandas

df['Fruit Total']= df.iloc[:, -4:-1].sum(axis=1)
print (df)
   Apples  Bananas  Grapes  Kiwis  Fruit Total
0     2.0      3.0     NaN    1.0          5.0
1     1.0      3.0     7.0    NaN         11.0
2     NaN      NaN     2.0    3.0          2.0
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insert multiple column pandas

df['column_new_1'], df['column_new_2'], df['column_new_3'] = [np.nan, 'dogs', 3]
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