Muliply only numeric values from object type column pandas

df = pd.DataFrame({'col1': [1, 2, 4, 5, 'object']})
df['col1'] * 5

this code multiplies ‘object’ string to 5 and writes the string 5 times but I want to multiply only numeric values strings should be leave as it is.
I have also tried to convert column to numeric using to_numeric with errors=’coerce’ it converts all string to nan

>Solution :

Use isnumeric to identify rows with numerics values.

import pandas as pd

df = pd.DataFrame({'col1': [1, 2, 4, 5, 'object']})

mask_ = df['col1'].astype(str).str.isnumeric()

df.loc[mask_, 'col1'] = df.loc[mask_, 'col1'] * 5

     col1
0       5
1      10
2      20
3      25
4  object