ValueError I O operation on closed file

Question

import csv      with open  v csv    w   as csvfile      cwriter   csv writer csvfile  delimiter      quotechar      quoting csv QUOTE MINIMAL   for w  c in p items        cwriter writerow w   c    Here  p is a dictionary  w and c both are strings   When I try to write to the file it reports the error   ValueError  I O operation on closed file

User · Answer

file   open  quot filename txt quot   newline     for row in self data      print row   Save data to a variable file   so you need a with

User · Answer

Same error can raise by mixing  tabs   spaces   with open   foo    w   as f    spaces OR  tab  print f        lt -- success   spaces AND tab  print f        lt -- fail

User · Answer

Indent correctly  your for statement should be inside the with block   import csv      with open  v csv    w   as csvfile      cwriter   csv writer csvfile  delimiter      quotechar      quoting csv QUOTE MINIMAL       for w  c in p items            cwriter writerow w   c    Outside the with block  the file is closed    gt  gt  gt  with open   tmp 1    w   as f          print f closed       False  gt  gt  gt  print f closed  True

User · Answer

I was getting this exception when debugging in PyCharm  given that no breakpoint was being hit  To prevent it  I added a breakpoint just after the with block  and then it stopped happening

User · Answer

I had this problem when I was using an undefined variable inside the with open      as f   I removed  or I defined outside  the undefined variable and the problem disappeared

[python] ValueError : I/O operation on closed file

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