dataframe columns to numeric code example

Example 1: column dataframe to int

df[[column_name]].astype(int)

Example 2: convert column to numeric pandas

# convert all columns of DataFrame
df = df.apply(pd.to_numeric) # convert all columns of DataFrame

# convert just columns "a" and "b"
df[["a", "b"]] = df[["a", "b"]].apply(pd.to_numeric)