searching a string

[tomtetlaw]

How do I search a string for anything?

What I mean is, I need to say:

if line == 'playername = (any name)':
    temp = line.strip().replace('playername=', '')
return temp

Any ideas?

[jlm699]

You could use regular expressions... here's an example:

>>> import re
>>> pattern = 'playername = (.*)'
>>> rc = re.compile(pattern)
>>> for line in ['playername = Johnny', 'playername = Foo Bar the Clown', 'somet
hing other than playername', 'another dud', 'playername = Chocolate Rain']:
...   rcm = rc.match(line)
...   if rcm:
...     print (rcm.group(1))
...
Johnny
Foo Bar the Clown
Chocolate Rain
>>>

Here's the documentation on the Python re module. It's apparently a "weak" representation of regular expressions, but it's always proved good enough for me to use. I suggest you become familiar with them, as they can be very powerful for searching and/or replacing text among other things...

[tomtetlaw]

This is my code:

def load_ini():
    fout = open('tpp.ini', 'r')
    fout.seek(0)
    lines = fout.readlines()
    p_map = re.compile('map =  (.*)')
    p_collision = re.compile('collision = (.*)')
    p_pname  = re.compile('playername = (.*)')
    for index, line in lines:
        if line == '\n':
            continue
        elif line == '[END_OF_FILE]':
            break
        else:
            if p_map.match(line):
                temp = line.strip().replace('map=', '')
            elif p_collision.match(line):
                temp2 = line.strip().replace('collision=', '')
            elif p_pname.match(line):
                temp3 = line.strip().replace('playername=', '')
            else:
                print 'File corrupted!'
                temp, temp2, temp3 = None
                break
                
    return [temp, temp2, temp3]

And I have been getting this error for a while:

Traceback (most recent call last):
  File "\\DIVINE-HERESY\Shared\Tom's Personal Project\main.py", line 156, in <module>
    if __name__ == '__main__': main()
  File "\\DIVINE-HERESY\Shared\Tom's Personal Project\main.py", line 110, in main
    p = Player(2, "rifleman_blu", 100)
  File "\\DIVINE-HERESY\Shared\Tom's Personal Project\main.py", line 63, in __init__
    self.name = load_ini()[2]
  File "\\DIVINE-HERESY\Shared\Tom's Personal Project\main.py", line 20, in load_ini
    for index, line in lines:
ValueError: too many values to unpack

I have done this sort of thing before, but I have never got this error :S

[tomtetlaw]

This is the contents of the tpp.ini file:

map = test.png
collision = test_collision.png
playername = defaultplayer
[END_OF_FILE]

[jlm699]

for index, line in lines:

for index, line in lines:
ValueError: too many values to unpack

I have done this sort of thing before, but I have never got this error :S

That's because you probably used enumerate before. Enumerate gives you index, value pairs. As it stands you're only iterating over the values of the lines list; however you're trying to unpack each value into both index and line , which is where the error stems from.

[tomtetlaw]

Thank you, that got rid of the error, but my file parser is wrong so it always returns corrupted.

[jlm699]

Looking back at your code....

Since you're simply using the string.replace() method I think using a regular expression is probably overkill. All you really need to do is use string.find(search_term) and check the return. This function will return the index of the starting position of search_term if found. Otherwise it will return -1. So to modify your code:

def load_ini():
    fout = open('tpp.ini', 'r')
    fout.seek(0)
    lines = fout.readlines()
    fout.close()            # I added this
    for index, line in enumerate(lines):
        if line == '\n':
            continue
        elif line == '[END_OF_FILE]':
            break
        else:
            if line.find('map =') != -1:
                temp = line.strip().replace('map =', '')
            elif line.find('collision =') != -1:
                temp2 = line.strip().replace('collision =', '')
            elif line.find('playername =') != -1:
                temp3 = line.strip().replace('playername =', '')
            else:
                print 'File corrupted!'
                temp, temp2, temp3 = None
                break
                
    return [temp, temp2, temp3]

I noticed that your input file has a space between the word (map, playername, etc) and the '=', but the replace you were using did not. This will make a difference. Especially when using the find/replace functions from string. A regular expression is more forgiving if you use the ? qualifier, which matches 0 or 1 times. The new pattern would look like this: 'collision ?= ?(.*)' ... I think. Like I said I'm not a master at regex but I do know it's powerful if you learn to use it correctly.