I was trying to map various locations in a file to a dictionary. At
first I read through the file using a for-loop, but tell() gave back
weird results, so I switched to while, then it worked.
The for-loop version was something like:
d = {}
for line in f:
if line.startswith('>'): d[line] = f.tell()
And the while version was:
d = {}
while 1:
line = f.readline()
if len(line) == 0: break
if line.startswith('>'): d[line] = f.tell()
In the for-loop version, f.tell() would sometimes return the same
result multiple times consecutively, even though the for-loop
apparently progressed the file descriptor. I don't have a clue why
this happened, but I switched to while loop and then it worked.
Does anyone have any ideas as to why this is so?
Thanks,
Magdoll
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