อัฟกานิสถานมีภาษาราชการกี่ภาษา
How many official languages does Afghanistan have?
country = pd.DataFrame(columns=['Code', 'Name']); countrylanguage = pd.DataFrame(columns=['CountryCode', 'IsOfficial'])
countrylanguage[(countrylanguage['CountryCode'].isin(country[country['Name'] == 'Afghanistan']['Code'])) & (countrylanguage['IsOfficial'] == 'T')].count()