[Tutor] how to read from a txt file
Danny Yoo
dyoo at hkn.eecs.berkeley.edu
Thu Feb 17 10:44:19 CET 2005
> >> Traceback (most recent call last):
> >> File "C:\Python23\practices\opentxt", line 12, in -toplevel-
> >> process(data)
> >> File "C:\Python23\practices\opentxt", line 6, in process
> >> data_points.append(int(line))
> >> ValueError: invalid literal for int():
Hi Brian,
Ah, think about empty lines.
Let's look at the error message again:
ValueError: invalid literal for int():
^^^^^^^
There's nothing visible there after the colon, and that's our hint.
Notice what happens when we pass int() some wacky strings:
###
>>> int("foobar")
Traceback (most recent call last):
File "<stdin>", line 1, in ?
ValueError: invalid literal for int(): foobar
###
So whatever is being passed to int() should show up in the error message.
This is exactly why getting literal error messages is so wonderful.
*grin*
Since we don't see anything here:
> >> File "C:\Python23\practices\opentxt", line 12, in -toplevel-
> >> process(data)
> >> File "C:\Python23\practices\opentxt", line 6, in process
> >> data_points.append(int(line))
> >> ValueError: invalid literal for int():
my best guess is that there's an empty line in the file, since we get the
same kind of error if we do this:
###
>>> int("")
Traceback (most recent call last):
File "<stdin>", line 1, in ?
ValueError: invalid literal for int():
###
Best of wishes to you!
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