python plain text regex parsing

Question

I need to write a small parser that will extract data from a form.

The data will be posted in a consistent pattern all the time. As follows:

Panakamanana
104412=Trident of Corrupted Waters
104411=Immerseus' Crystalline Eye
104435=Stonetoe's Tormented Treads
104455=Reality Ripper Ring
99716=Chest of the Cursed Protector
104509=Laser Burn Bracers
104531=Haromm's Talisman
99722=Gauntlets of the Cursed Protector
104562=Ring of Restless Energy
104606=Gleaming Eye of the Devilsaur
99725=Helm of the Cursed Protector
99719=Shoulders of the Cursed Protector
104616=Ticking Ebon Detonator
105686=Hellscream's Pig Sticker

The only data I'm interested in is each integer before the = sign. I want to then be able to iterate over these so perhaps putting them in a dict or array or something would be great.

Split on = perhaps would be easier?

Jerry
– Jerry

2014-03-22 12:13:40 +00:00
Commented Mar 22, 2014 at 12:13 — Jerry
– Jerry, Commented Mar 22, 2014 at 12:13

Burhan Khalid · Accepted Answer · 2014-03-22 12:19:46Z

2

Here is one way to get it done:

with open('somefile.txt') as f:
   next(f) # Skips the first line, which doesn't have =
   numbers = [line.split('=')[0] for line in f if len(line.strip())]

print(numbers)

If you want to use regular expressions:

>>> import re
>>> s = "104412=Trident of Corrupted Waters"
>>> re.findall(r'^(\d+)', s)[0]
'104412'

answered Mar 22, 2014 at 12:19

Burhan Khalid

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anon582847382 · Accepted Answer · 2014-03-22 12:18:47Z

1

Just split the string up using '=' as the delimiter. The most Pythonic way to implement this would be to use a list comprehension:

>>> [int(line.split('=')[0]) for line in your_lines[1:]]
[104412, 104411, ..., 105686]

Where your_lines is a list of the lines demonstrated in your question.

answered Mar 22, 2014 at 12:18

anon582847382

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sshashank124 · Accepted Answer · 2014-03-22 12:24:43Z

0

You can simply do that as follows:

new_list = [int(line[:line.find('=')]) for line in your_list]

print new_list

edited Mar 22, 2014 at 12:24

answered Mar 22, 2014 at 12:14

sshashank124

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5 Comments

Burhan Khalid Over a year ago

You don't need new_list = []

sshashank124 Over a year ago

@Burhan, But don't I need to initialize a list in which to add the data

sshashank124 Over a year ago

@BurhanKhalid, Just like that?

anon582847382 Over a year ago

@sshashank124 No, that would return a NameError. He means a list comprehension. Take a look at our answers and you will see what he means.

Burhan Khalid Over a year ago

You can do new_list = [int(line[:line.find('=')]) for line in your_list] and get rid of the for loop entirely.

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