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)
应用于filex.csv：
A,B
123,abc
1234,abcd
1234567890,abcdefghij
上面的代码打印
A B
2 1234567890 abcdefghij
602392714
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