how to add string to all values of column in pandas

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Camila
11 May 2018
1>>> df = pd.DataFrame({'col':['a',0]})
2>>> df
3  col
40   a
51   0
6>>> df['col'] = 'str' + df['col'].astype(str)
7>>> df
8    col
90  stra
101  str0
11
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