[Tutor] Callable? Whats callable?
Sun, 26 Aug 2001 09:54:07 -0700
On Sun, 26 Aug 2001 12:13:16 -0400, "epoch7" <firstname.lastname@example.org> wrote
about Re: [Tutor] Callable? Whats callable?:
OK, you have a few problems here, which mostly have to do with mixing
together "types" that don't go together.
For example, if you have an open file, then you can do:
file1.read() ... if you opened it for reading
file2.write() ... if you opened it for writing.
But, if x is a string, then you can't do
Because .read() and .write() are file methods. They don't work on
strings, or on regular expression patterns and such. (Well, when you get
a bit more advanced, there are things that aren't *strictly* files, that
have file-like methods, but let's not get into that today.)
:alright. so i fixed the error in y. originally i started putting in the
:read()s and stuff to be able to fix an error/find a workaround.
:i was getting, here's how i got that error:
:file1 = raw_input("Name of file to convert: ")
:file2 = raw_input("Name of file to output to: ")
:in_file = open(file1, "r")
:out_file = open(file2, "w")
:x = in_file.read()
:text = re.compile('url=(\w*)&', re.IGNORECASE)
:y = text.findall(x)
:and here's the error
:Traceback (most recent call last):
: File "F:\Python21\reusage.py", line 11, in ?
At first I was going to suggest that you change the line
But, if you do, you will get this error:
Traceback (most recent call last):
File "C:\My Documents\temp.py", line 12, in ?
TypeError: argument must be string or read-only character buffer, not
The point is, y.write(text) isn't going to work, because y isn't a file,
and .write() is a file method.
Now, if you try
at least out_file is a file. So this is a bit better. HOWEVER, text
isn't a string. And when you try to write stuff to a file, it has to be
I looked up the findall() command (since I'm not familiar with it) and
it says that findall() returns a list of all non-overlapping matches of
pattern in string. Well, there's a problem. text is a list, not a
I'm not sure how to advise you on this, exactly, since I don't know the
regular expression stuff.
You write that you are trying to do this:
:And for those of you just wondering what im trying to do, its supposed to search out for strings of text
:between to strings("url=" and "&"). and then output the list of strings to a file.
It is possible to do this with just string operations. If you'd like to
try that, see:
I hope some of this explanation helped.