Pandas Dataframe 过滤器包含（'.'），Python 3.6

Question

I have Dataframe which contains Year from 1947-2019, but one row contains '2018.1'. When I filter for Data where Date contains ".", results gives all the Data

DataAll.loc[DataAll['Date'].astype(str).str.contains('.'), 'Date']

I have checked for Data Types and all are in string

DataAll['Date'].apply(type).unique()
array([<class 'str'>], dtype=object)

How to filter Data which contains ".", Please help.

Answer 1

Here is . special regex chcaracter, so need regex=False or escape it:

DataAll.loc[DataAll['Date'].astype(str).str.contains('.', regex=False), 'Date']

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DataAll.loc[DataAll['Date'].astype(str).str.contains('\.'), 'Date']