all(self, skipna: 'bool' = True)
Flag to ignore nan values during truth testing.
DataFrame or Series of boolean values, where a value is True if all elements are True within its respective group, False otherwise.
Return True if all values in the group are truthful, else False.
DataFrame.groupby
Apply a function groupby to each row or column of a DataFrame.
Series.groupby
Apply a function groupby to a Series.
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