Re: [Tutor] Need help with converting script using 2.6's urllib2 to Python 3.1
On 25 October 2010 14:46, Richard D. Moores rdmoo...@gmail.com wrote:
I'd like to convert the script to 3.1, but I can't understand the docs
for the 3.1 urllib module. Please someone tell me what to do.
(Converting 'print rate' to 'print(rate)' I understand.)
Have you actually tried reading the documentation? The _very_ first
section of the urllib documentation we have urllib.request.urlopen
[1]. Which looks to me what you are looking for as a replacement to
urllib2.urlopen().
Some *untested* inline comments below.
import urllib2
from urllib import request
a =
urllib2.urlopen('http://www.marketwatch.com/investing/currency/CUR_USDYEN').read(20500)
a =
request.urlopen('http://www.marketwatch.com/investing/currency/CUR_USDYEN').read(20500)
b = a[19000:20500]
idx_pricewrap = b.find('pricewrap')
context = b[idx_pricewrap:idx_pricewrap+80]
idx_bgLast = context.find('bgLast')
rate = context[idx_bgLast+8:idx_bgLast+15]
print rate
print(rate)
Also http://docs.python.org/library/2to3.html discusses the automated
tool for converting python code.
Greets
Sander
[1]
http://docs.python.org/py3k/library/urllib.request.html#urllib.request.urlopen
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Re: [Tutor] Need help with converting script using 2.6's urllib2 to Python 3.1
On Mon, Oct 25, 2010 at 08:38, Sander Sweers sander.swe...@gmail.com wrote:
Have you actually tried reading the documentation?
Of course. Though I can see why you wondered.
The _very_ first
section of the urllib documentation we have urllib.request.urlopen
[1]. Which looks to me what you are looking for as a replacement to
urllib2.urlopen().
What I tried were these 3 lines:
import urllib
a =
urllib.request.urlopen('http://www.marketwatch.com/investing/currency/CUR_USDYEN').read(20500)
print(a[123:140])
which got me
Traceback (most recent call last):
File c:\P31Working\test_urllib.py, line 2, in module
a =
urllib.request.urlopen('http://www.marketwatch.com/investing/currency/CUR_USDYEN').read(20500)
AttributeError: 'module' object has no attribute 'request'
Process terminated with an exit code of 1
Doing it your way,
from urllib import request
a =
request.urlopen('http://www.marketwatch.com/investing/currency/CUR_USDYEN').read(20500)
print(a[123:140])
succeeds. Why?
Anyway, thanks.
Dick
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Re: [Tutor] Need help with converting script using 2.6's urllib2 to Python 3.1
And trying 2to3.py, which I've used successfully before, gets
C:\P26Working\Finished\For2to32to3 -w -f urllib dollar2yen_rate_simple.py
Traceback (most recent call last):
File C:\P26Working\Finished\For2to3\2to3.py, line 2, in module
from lib2to3.main import main
File C:\P26Working\Finished\For2to3\lib2to3\main.py, line 34
except os.error, err:
^
SyntaxError: invalid syntax
dollar2yen_rate_simple.py can be seen at http://tutoree7.pastebin.com/4Aq9CuXS
Also,
Running this code in Python 3.1:
from urllib import request
a =
request.urlopen('http://www.marketwatch.com/investing/currency/CUR_USDYEN').read(20500)
b = a[19000:20500]
idx_pricewrap = b.find('pricewrap')
context = b[idx_pricewrap:idx_pricewrap+80]
idx_bgLast = context.find('bgLast')
rate = context[idx_bgLast+8:idx_bgLast+15]
print(rate)
gets
Traceback (most recent call last):
File c:\P31Working\test_urllib.py, line 4, in module
idx_pricewrap = b.find('pricewrap')
TypeError: expected an object with the buffer interface
Process terminated with an exit code of 1
I have NO idea what that error means.
Dick
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Re: [Tutor] Need help with converting script using 2.6's urllib2 to Python 3.1
On 25 October 2010 18:19, Richard D. Moores rdmoo...@gmail.com wrote:
Doing it your way,
from urllib import request
a =
request.urlopen('http://www.marketwatch.com/investing/currency/CUR_USDYEN').read(20500)
print(a[123:140])
succeeds. Why?
Not sure how this exactly works but this is what I know. The
difference is that urllib is now a directory with files in it while
urllib2 was a single file. When you import module on a a single file
module normally all functions and classes are available to you.
Now that this is a directory some magic (or not?) has to happen in
__init__.py (read I also don't know). But I am sure someone here will
be able to explain this properly :-).
Greets
Sander
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Re: [Tutor] Need help with converting script using 2.6's urllib2 to Python 3.1
So I finally find a relevant example in the docs:
http://docs.python.org/py3k/library/urllib.request.html?highlight=urllib#examples
The first example gave me some understanding and led me to revising my code to
import urllib.request
f =
urllib.request.urlopen('http://www.marketwatch.com/investing/currency/CUR_USDYEN')
a = f.read(20500).decode('utf-8')
b = a[19000:20500]
idx_pricewrap = b.find('pricewrap')
context = b[idx_pricewrap:idx_pricewrap+80]
idx_bgLast = context.find('bgLast')
rate = context[idx_bgLast+8:idx_bgLast+15]
print(rate)
which works like a charm.
Dick
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