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add column using a list at poisition zero pandas

By MakstarMakstar on Jun 30, 2020
df = pd.DataFrame({'B': [1, 2, 3], 'C': [4, 5, 6]})

df
Out: 
   B  C
0  1  4
1  2  5
2  3  6

idx = 0
new_col = [7, 8, 9]  # can be a list, a Series, an array or a scalar   
df.insert(loc=idx, column='A', value=new_col)

df
Out: 
   A  B  C
0  7  1  4
1  8  2  5
2  9  3  6

Source: stackoverflow.com

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pd add column with zeros

By Outrageous OctopusOutrageous Octopus on May 14, 2021
df['new'] = 0

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