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
A teammate sorts the DataFrame by score, and suddenly df.iloc[0] returns a different user than yesterday. What happened, and which lookup would have been stable?