RE: Are these tutorials the best tutorials for learning Python?

[learning]

Hi Saurabh, those are good for ones to become proficient in writing Python
Code. 

Regards,
Sriram Srinivasan
www.sriramsrinivasan.in

-Original Message-
From: Python-list
[mailto:python-list-bounces+learning=sriramsrinivasan...@python.org] On
Behalf Of Saurabh Hooda
Sent: 09 August 2017 13:59
To: python-list@python.org
Subject: Are these tutorials the best tutorials for learning Python?

Hello,
https://hackr.io/tutorials/learn-python proclaims that it's a collection of
the best tutorials recommended by the programming community. Do you agree?
Is there any better tutorial?

Thanks in advance,
Saurabh Hooda
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Scrapy/XPath help

[Always Learning]

Hello all. I'm new to Python, but have been playing around with it for a few 
weeks now, following tutorials, etc. I've spun off on my own and am trying to 
do some basic web scraping. I've used Firebug/View XPath in Firefox for some 
help with the XPaths, however, I still am receiving errors when I try to run 
this script. If you could help, it would be greatly appreciated!

from scrapy.spider import BaseSpider
from scrapy.selector import HtmlXPathSelector
from cbb_info.items import CbbInfoItem, Field

class GameInfoSpider(BaseSpider):
name = "game_info"
allowed_domains = ["www.sbrforum.com"]
start_urls = [
'http://www.sbrforum.com/betting-odds/ncaa-basketball/',
]

def parse(self, response):
hxs = HtmlXPathSelector(response)
toplevels = hxs.select("//div[@class='eventLine-value']")
items = []
for toplevels in toplevels:
item = CbbInfoItem()
item ["teams"] = 
toplevels.select("/span[@class='team-name'/text()").extract()
item ["lines"] = toplevels.select("/div[@rel='19']").extract()
item.append(item)
return items
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Re: Scrapy/XPath help

[Always Learning]

Sorry about that. I'm using Python 2.7.3, 32 bit one Windows 7.

The errors I get are

>>File 
>>"C:\python27\lib\site-packages\scrapy-0.16.3-py2.7.egg\scrapy\selector\lxmlsel.py",
>> line 47, in select
>>raise ValueError("Invalid XPath: %s" % xpath)
>>exceptions.ValueError: Invalid XPath: /span[@class='team-name'/text()

Ultimaly, I expect it to gather the team name in text, and then the odds in one 
of the columns in text as well, so I can then put it into a .csv
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a dummy python question

[Learning Python]

A example in learning Python by Mark Lutz and David Ascher

about function scope

example like this:

>>def outer(x):
 def inner(i):
print i,
if i: inner(i-1)
 inner(x)
>>outer(3)

Here supposely, it should report error, because the function inner
cannot see itself since inner is only in local namespace of outer.

but I typed in this in python interface. It works!
it print out:
3 2 1 0


If you turn this into a module file and run this
it print out
3 2 1 0 none

Can anyone explain to me what's going on?

Thanks

BTW: I am using Python 2.3

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Re: a dummy python question

[Learning Python]

Thanks all for replying.
I finally know what's going on.

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argument matching question

[Learning Python]

I know this is dummy, just never saw an example of this.


I want to use the special argument matching.

A code like this:

def adder(**varargs):
  sum=varargs[varargs.keys()[0]]
  for next in varargs.keys()[1:]:
sum=sum+varargs[next]
  return sum

print adder( "first","second",'third')



It pop up error like this:

Traceback (most recent call last):
  File "learn.py", line 7, in ?
print adder( "first","second",'third')
TypeError: adder() takes exactly 0 arguments (3 given)


How to pass arguments to a functions that use dictionary collection?


Thanks

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Re: argument matching question

[Learning Python]

thanks, got it.
I want to test the **name option for argument matching.

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circular import problem

[Learning Python]

An example in the book I didn't understood well
two modules files recursively import/from each other

in recur1.py,we have:

x=1
import recur2
y=1


in recur2.py, we have

from recur1 import x
from recur1 import y


If we run interactively at python command line,

>>> import recur1
it has errors like this:
Traceback (most recent call last):
  File "", line 1, in ?
  File "recur1.py", line 2, in ?
import recur2
  File "recur2.py", line 2, in ?
from recur1 import y
ImportError: cannot import name y

I understood this because recur1 is not finished when recur2 is trying
to import y.

However, if you run interactive for recur2.py interactively, it is
fine.
when you run as script from command line, recur1.py is fine. but when
you
python recur2.py at commmand line, it has errors like this:
Traceback (most recent call last):
  File "recur2.py", line 1, in ?
from recur1 import x
  File "recur1.py", line 2, in ?
import recur2
  File "recur2.py", line 2, in ?
from recur1 import y
ImportError: cannot import name y

What's really the problem here?

Thanks

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intermediate python csv reader/writer question from a beginner

[Learning Python]

anything related to csv, I usually use VB within excel to manipulate
the data, nonetheless, i finally got the courage to take a dive into
python.  i have viewed a lot of googled csv tutorials, but none of
them address everything i need.  Nonetheless, I was wondering if
someone can help me manipulate the sample csv (sample.csv) I have
generated:

,,
someinfo,,,
somotherinfo,,,
SEQ,Names,Test1,Test2,Date,Time,,
1,Adam,1,2,Monday,1:00 PM,,
2,Bob,3,4,Monday,1:00 PM,,
3,Charlie,5,6,Monday,1:00 PM,,
4,Adam,7,8,Monday,2:00 PM,,
5,Bob,9,10,Monday,2:00 PM,,
6,Charlie,11,12,Monday,2:00 PM,,
7,Adam,13,14,Tuesday,1:00 PM,,
8,Bob,15,16,Tuesday,1:00 PM,,
9,Charlie,17,18,Tuesday,1:00 PM,,

into (newfile.csv):

Adam-Test1,Adam-Test2,Bob-Test1,Bob-Test2,Charlie-Test1,Charlie-
Test2,Date,Time
1,2,3,4,5,6,Monday,1:00 PM
7,8,9,10,11,12,Monday,2:00 PM
13,14,15,16,17,18,Tuesday,1:00 PM

note:
1. the true header doesn't start line 4 (if this is the case would i
have to use "split"?)
2. if there were SEQ#10-12, or 13-15, it would still be Adam, Bob,
Charlie, but with different Test1/Test2/Date/Time
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