lesson 3 of 6 · dataframe selection and cleaning without guessingdataframe selection and cleaning without guessinglesson 3 of 6 · dataframe selection and cleaning without guessingdataframe selection and cleaning without guessinglesson 3 of 6 · dataframe selection and cleaning without guessingdataframe selection and cleaning without guessinglesson 3 of 6 · dataframe selection and cleaning without guessingdataframe selection and cleaning without guessinglesson 3 of 6 · dataframe selection and cleaning without guessingdataframe selection and cleaning without guessinglesson 3 of 6 · dataframe selection and cleaning without guessingdataframe selection and cleaning without guessinglesson 3 of 6 · dataframe selection and cleaning without guessingdataframe selection and cleaning without guessinglesson 3 of 6 · dataframe selection and cleaning without guessingdataframe selection and cleaning without guessinglesson 3 of 6 · dataframe selection and cleaning without guessingdataframe selection and cleaning without guessinglesson 3 of 6 · dataframe selection and cleaning without guessingdataframe selection and cleaning without guessinglesson 3 of 6 · dataframe selection and cleaning without guessingdataframe selection and cleaning without guessing
Fill in the keyword that turns this comprehension into a boolean-mask filter (keep only rows that pass the test).
Keyword: