Programming Forums > Script Programming > Python

Arevos · Mar 10th, 2006, 3:13 AM

There's also Beautiful Soup, which is supposed to be quite highly regarded.

Sane · Mar 10th, 2006, 6:27 AM

Yeah, I heard about Beautiful Soup, but not htmlib. I really don't want to import an entire parsing library when all I need to do is parse one kind of tag with one function.

Jessehk · Mar 10th, 2006, 4:21 PM

I'm sure there is an easier way (there always seems to be one in Python :p), but I made a little reverser function.

It will take either a string, tuple, or list and return the same data-type, reversed.

(Toggle Plain Text)

def reverse(ls):
	"""Reverses and return a string, list, or tuple."""
	res = [ls[len(ls) - x] for x in range(1, len(ls) + 1)]
	
	if types.StringType == type(ls):
		res = "".join(res)
	
	elif types.TupleType == type(ls):
		res = tuple(res)

	return res

Arevos · Mar 10th, 2006, 5:15 PM

Python 2.4 has the "reversed" function, which iterates over a sequence backward. So you could do this:

(Toggle Plain Text)

def reverse(s):
    r = reversed(s)
    if type(s) == list:  return list(r)
    if type(s) == tuple: return tuple(r)
    if type(s) == str:   return "".join(r)

Or even this:

(Toggle Plain Text)

def reverse(s):
    return { str : "".join, list : list, tuple : tuple }[type(s)](reversed(s))

Jessehk · Mar 10th, 2006, 5:19 PM

I didn't know about the reversed() function.

*And I think that is the most clever use of dictionaries I have ever seen. :eek

Thanks Arevos

Mar 10th, 2006, 4:21 PM	#13
Jessehk The Oblivious One Join Date: May 2005 Location: Ontario, Canada Posts: 644 Rep Power: 4	I'm sure there is an easier way (there always seems to be one in Python :p), but I made a little reverser function. It will take either a string, tuple, or list and return the same data-type, reversed. (Toggle Plain Text) def reverse(ls): """Reverses and return a string, list, or tuple.""" res = [ls[len(ls) - x] for x in range(1, len(ls) + 1)] if types.StringType == type(ls): res = "".join(res) elif types.TupleType == type(ls): res = tuple(res) return res def reverse(ls): """Reverses and return a string, list, or tuple.""" res = [ls[len(ls) - x] for x in range(1, len(ls) + 1)] if types.StringType == type(ls): res = "".join(res) elif types.TupleType == type(ls): res = tuple(res) return res __________________ Dr. Zoidberg: [ecstatic] I'm going to a movie... with FRIENDS! Last edited by Jessehk; Mar 10th, 2006 at 4:51 PM.

Mar 10th, 2006, 5:15 PM	#14
Arevos Programming Guru Join Date: Aug 2005 Location: England Posts: 1,499 Rep Power: 5	Python 2.4 has the "reversed" function, which iterates over a sequence backward. So you could do this: (Toggle Plain Text) def reverse(s): r = reversed(s) if type(s) == list: return list(r) if type(s) == tuple: return tuple(r) if type(s) == str: return "".join(r) def reverse(s): r = reversed(s) if type(s) == list: return list(r) if type(s) == tuple: return tuple(r) if type(s) == str: return "".join(r) Or even this: (Toggle Plain Text) def reverse(s): return { str : "".join, list : list, tuple : tuple }[type(s)](reversed(s)) def reverse(s): return { str : "".join, list : list, tuple : tuple }[type(s)](reversed(s))

Mar 10th, 2006, 5:19 PM	#15
Jessehk The Oblivious One Join Date: May 2005 Location: Ontario, Canada Posts: 644 Rep Power: 4	I didn't know about the reversed() function. *And I think that is the most clever use of dictionaries I have ever seen. :eek Thanks Arevos __________________ Dr. Zoidberg: [ecstatic] I'm going to a movie... with FRIENDS!

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Mar 10th, 2006, 3:13 AM	#11
Arevos Programming Guru Join Date: Aug 2005 Location: England Posts: 1,499 Rep Power: 5	There's also Beautiful Soup, which is supposed to be quite highly regarded.

Mar 10th, 2006, 6:27 AM	#12
Sane Programming Guru Join Date: Apr 2005 Location: Waterloo, Ontario Posts: 1,869 Rep Power: 5	Yeah, I heard about Beautiful Soup, but not htmlib. I really don't want to import an entire parsing library when all I need to do is parse one kind of tag with one function.

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Programming Forums > Script Programming > Python

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