pandas if value in column then keep code example
Example 1: check if value is in series pandas
In [21]: s.unique()
Out[21]: array(['a', 'b', 'c'], dtype=object)
In [22]: 'a' in s.unique()
Out[22]: True
Example 2: pandas look for values in column with condition
df.loc[(df['column_name'] >= A) & (df['column_name'] <= B)]