add column using a list at poisition zero pandas

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Camilla
08 Feb 2020
1insert_index = 0
2insert_colname = 'new column'
3insert_values = [1, 2, 3, 4, 5] # this can be a numpy array too
4df.insert(loc=insert_index, column=insert_colname, value=insert_values)
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Elena
12 Sep 2020
1df = pd.DataFrame({'B': [1, 2, 3], 'C': [4, 5, 6]})
2
3df
4Out: 
5   B  C
60  1  4
71  2  5
82  3  6
9
10idx = 0
11new_col = [7, 8, 9]  # can be a list, a Series, an array or a scalar   
12df.insert(loc=idx, column='A', value=new_col)
13
14df
15Out: 
16   A  B  C
170  7  1  4
181  8  2  5
192  9  3  6
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