How to solve “OSError: telling position disabled by next() call”

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I don’t know if this was the original error but you can get the same error if you try to call f.tell() inside of a line-by-line iteration of a file like so:

with open(path, "r+") as f:
  for line in f:
    f.tell() #OSError

which can be easily substituted by the following:

with open(path, mode) as f:
  line = f.readline()
  while line:
    f.tell() #returns the location of the next line
    line = f.readline()

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