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python append to a exiting csv file

row = {'colA': 'var1', 'colB': 'var2'}

fieldnames = ['colA', 'colB']
with open('file.csv', 'a', encoding='utf8', newline='') as file:
  writer = csv.DictWriter(file, fieldnames=fieldnames)
  writer.writerow(item)

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python append to a exiting csv file

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