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How to merge CSV files in Python?

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import os
import glob
import pandas as pd
os.chdir("/csv_files_directory")

extension = 'csv'
all_filenames = [i for i in glob.glob('*.{}'.format(extension))]

#combine all files in the list
combined_csv = pd.concat([pd.read_csv(f) for f in all_filenames ])
#export to csv
combined_csv.to_csv( "merged.csv", index=False, encoding='utf-8-sig')
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