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finalfaultdata = pd.read_csv('FinalFaultData.csv')

passedmaster = pd.read_csv('PASSEDMASTER.csv')

A = pd.concat([finalfaultdata,passedmaster])

print(A)

with open ('output.csv', 'w') as output:

writer = csv.writer(output)

writer.writerows(A)

1 Answers1

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As you are using Pandas, you can merge the dataframe:

finalfaultdata = finalfaultdata.merge(passedmaster)

https://pandas.pydata.org/docs/reference/api/pandas.DataFrame.merge.html

To save it as a CSV you can simply use:

finalfaultdata.to_csv('finalfaultdata.csv')