Python: Pandas filter string data based on its string length

Question

I like to filter out data whose string length is not equal to 10.

If I try to filter out any row whose column A\'s or B\'s string length is not equal to 10, I tried

Answer 1

import pandas as pd

df = pd.read_csv('filex.csv')
df['A'] = df['A'].astype('str')
df['B'] = df['B'].astype('str')
mask = (df['A'].str.len() == 10) & (df['B'].str.len() == 10)
df = df.loc[mask]
print(df)

Applied to filex.csv:

A,B
123,abc
1234,abcd
1234567890,abcdefghij

the code above prints

            A           B
2  1234567890  abcdefghij