Re: What is rstrip() in python?

[Will Acheson]

On Sunday, November 9, 2014 6:12:24 AM UTC-5, satish...@gmail.com wrote:
> What is rstrip() in python?
> 
> What does it do in the following piece of code?
> 
> import sqlite3
> conn = sqlite3.connect('dbase1')
> curs = conn.cursor()
> 
> file = open('data.txt')
> rows = [line.rstrip().split(',') for line in file]

rstrip() removes whitespace, newline characters, tab characters, and carrige 
return characters (\n \t \r respectively) on the tail of a string.  

Or it can be used with an input parameter to remove all instances of that 
parameter from the tail of a string.

ex:
 stringy = "i am helpful  \t\t\t\t\n\n  "
 stringy = stringy.rstrip()
 print stringy

stdout: "i am helpful"

or:
 stringy = "my favorite number is 80"
 stringy = stringy.rstrip('0')
 print stringy

stdout: "my favorite number is 8"



pretty simple method, helpful for parsing out formatting characters from 
scraped content from webpages.
https://docs.python.org/2/library/stdtypes.html?highlight=rstrip#str.rstrip
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Re: Python modules

[Will Acheson]

On Sunday, November 9, 2014 11:51:41 PM UTC-5, Steve Hayes wrote:
> I have a book on Python that advocates dividing programs into modules, and
> importing them when needed. 
> 
> I have a question about this.
> 
> I can understand doing that in a compiled language, where different modules
> can be imported from all sorts of places when the program is compiled. 
> 
> But I understand that Python is an interpreted language, and If I wrote a
> program in Python like that, and wanted to run it on another computer, how
> would it find all the modules to import at run-time, unless I copied the whole
> directory structure over to the other computer?
> 
> 
> 
> 
> -- 
> Steve Hayes from Tshwane, South Africa
> Web:  http://www.khanya.org.za/stevesig.htm
> Blog: http://khanya.wordpress.com
> E-mail - see web page, or parse: shayes at dunelm full stop org full stop uk

I have had a lot of trouble with executing relative imports with some of my 
projects in python.  

Are there any best practices or methods besides '../../' type hard-coding?

In one project, a spider using scrapy, I used this method to import a module 
from 'the other side' of a file directory. 


spider_lib_path = os.path.realpath(os.path.dirname(__file__) + 
'/../../../../../library/python')
object_builder_printer = imp.load_source('object_builder_printer', 
spider_lib_path + '/object_builder_printer.py')
object_builder = object_builder_printer.object_builder_printer(settings)


the file structure was:

spiders/
-current/
--app/
---spiders/
scrapy/
-Charlotte/
--1.0/
---pipelines.py (the file that needs to import object_builder_printer.py)

--library/
---python/
object_builder_printer.py


I think the issue had something to do with there being duplicitous file names, 
as in, there are multiple directories named 'spiders'.




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