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In the above sample data, I have empty fields and now the task is to fill the fields with previous values. my columns are dates and the values are a number of items present for that particular article for the specific date. which would be a faster way to interpolate the missing fields. Any suggestions to build the function is appreciated.

LIONEL JOSEPH
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You can use fillna function with ffill method:

df.fillna(method='ffill', inplace=True)
serali
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