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)
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)
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')