[ python-Bugs-1429481 ] For loop exit early
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Sat Feb 11 05:34:55 CET 2006
Bugs item #1429481, was opened at 2006-02-10 19:13
Message generated for change (Comment added) made by tim_one
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Category: Python Library
>Group: Not a Bug
Status: Closed
Resolution: Invalid
Priority: 5
Submitted By: msmith (mike_smith)
Assigned to: Nobody/Anonymous (nobody)
Summary: For loop exit early
Initial Comment:
When I run the following snippet the "for" loop exits
early, not examining every item in the "lines" list.
It will only print part of the list, i.e., only
approximately 65% of any list I use is printed. (E.g.,
a list of 100 items only about 65 is printed)
If I wrap the for statement in another for statement
with a range() operator it works.
I'm pretty new to scripting, so I'm sure there's a
better way to do what I'm trying; but this seems like a
bug.
Thanks for your help,
=========================
count = 0
lines =
["1","2","3","4","5","6","7","8","9","10","11","12","13","14","15","16"]
def getnextline():
l = lines.pop()
l = l.strip()
return l
for x in lines:
count += 1
newline = "%s,%s,\n" % (getnextline(),getnextline())
print count, ":", newline
Output:
---------
1 : 16,15,
2 : 14,13,
3 : 12,11,
4 : 10,9,
5 : 8,7,
6 : 6,5,
----------------------------------------------------------------------
>Comment By: Tim Peters (tim_one)
Date: 2006-02-10 23:34
Message:
Logged In: YES
user_id=31435
Changed "group" to not-a-bug.
----------------------------------------------------------------------
Comment By: Raymond Hettinger (rhettinger)
Date: 2006-02-10 19:25
Message:
Logged In: YES
user_id=80475
Sorry, the bug is in your code (the for-loop is looping
over a list that is being mutated by pops). I recommend
posting on comp.lang.python or to the python-tutor list to
get feedback on how to write this correctly.
----------------------------------------------------------------------
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