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  1. import os
  2. import csv
  3.  
  4. with open('f1.csv') as f1, open('f2.csv') as f2, open('out', 'w') as out:
  5.     reader = csv.reader(f1, delimiter='\t')
  6.     writer = csv.writer(out, delimiter='\t')
  7.     lines = set(line.strip() for line in f2)
  8.     for row in reader:
  9.         if row[1] in lines:
  10.             row[1] = '123'
  11.         writer.writerow(row)
  12. os.rename('out', 'f1.csv')
  13.  
Runtime error #stdin #stdout #stderr 0.17s 23488KB
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Standard input is empty
stdout
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Standard output is empty
stderr
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Traceback (most recent call last):
  File "./prog.py", line 4, in <module>
FileNotFoundError: [Errno 2] No such file or directory: 'f1.csv'
https://ideone.com/bG4f0y
language:
Python 3 (python  3.9.5)
created:
3 years ago
visibility:
secret

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