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# importing pandas as pd
import pandas as pd
# sample dataframe
df = pd.DataFrame({
'A': [1, 2, 3, '4', '5'],
'B': ['a', 'b', 'c', 'd', 'e'],
'C': [1.1, '2.1', 3.0, '4.1', '5.1']})
# using apply method
df[['A', 'C']] = df[['A', 'C']].apply(pd.to_numeric)
print(df.dtypes)