python - How to lowercase a pandas dataframe string column if it has missing values? - Stack Overflow

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Wed Aug 26 2020 14:58:43 GMT+0000 (Coordinated Universal Time)

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df['x'].str.lower()
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https://stackoverflow.com/questions/22245171/how-to-lowercase-a-pandas-dataframe-string-column-if-it-has-missing-values