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To: python-list@python.org
From: Dennis Lee Bieber <wlfraed@ix.netcom.com>
Subject: Re: Using filepath method to identify an .html page
Date: Tue, 22 Jan 2013 16:44:17 -0500
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On Tue, 22 Jan 2013 07:21:28 -0800 (PST), Ferrous Cranus
<nikos.gr33k@gmail.com> declaimed the following in
gmane.comp.python.general:

> I cannot.
> I don't even know yet if hashing needs to be used for what i need.
> 
> The only thing i know is that:
> 
> a) i only need to get a number out of string(being an absolute path)
> b) That number needs to be unique, because "that" number is an indicator to the actual html file.

	So you want to generate a number that is used to look up another
file?

	How many files are you referring to here? Do you mean "indicator to
the actual html file" is "indicator to the COUNTER". Otherwise it is
just an indicator to the same path you started with.

	How is this "indicator" to be used? Is it PART OF "the actual html
file"? Is it a key in a database used to retrieve "the actual html
file"?

	Pseudo-code:

	con = DB.connection()
	cur = con.cursor()

	cur.execute("select ID from PATHLINK where PATH = %s", thePath)
	data = cur.fetchone()	#there should only be ONE
	if not data:	#thePath doesn't exist, must be new file
		cur.execute("insert into PATHLINK (PATH) values (%s)", thePath)
		id = cur.lastrowid
	else:
		id = data[0]

	con.commit()



> 
> Would you help me write this in python?
> 
> Why the hell 
> 
> pin = int ( '/home/nikos/public_html/index.html' )
> 
> fails? because it has slashes in it?

	It fails because it is NOT A DECIMAL INTEGER STRING

>>> int("123")
123
>>> int ("abc")
Traceback (most recent call last):
  File "<interactive input>", line 1, in <module>
ValueError: invalid literal for int() with base 10: 'abc'
>>> int("abc", 16)
2748
>>> int ("abc", 12)
Traceback (most recent call last):
  File "<interactive input>", line 1, in <module>
ValueError: invalid literal for int() with base 12: 'abc'
>>> int ("abc", 13)
1845
>>> 

	All something you could work out by running a Python interpreter in
a command shell and entering one-liner statements.

E:\UserData\Wulfraed\My Documents>python
ActivePython 2.7.2.5 (ActiveState Software Inc.) based on
Python 2.7.2 (default, Jun 24 2011, 12:21:10) [MSC v.1500 32 bit
(Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> int("abc", 14)
2126
>>> int("abc")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: invalid literal for int() with base 10: 'abc'
>>>

-- 
	Wulfraed                 Dennis Lee Bieber         AF6VN
        wlfraed@ix.netcom.com    HTTP://wlfraed.home.netcom.com/