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I have a file Test.csv as below
ColumnA
FM
NA
EC

When run code below, it shows nan, not 'NA'. how to fix it? Thanks
FM
nan
EC

import pandas as pd
df = pd.DataFrame(pd.read_csv('Test.csv'))
for s in df['ColumnA']:
    print(s)

pd.read_csv('Test.csv', na_filter = False)

ian