script closed before i can see the error that occurs?

[snippsat]

 I do not understand what that line (19 and 23) does. Is there a program that translate code to English? lol.

Python has interactive interpreter where you can test stuff out.
Here i just paste in line 19.

>>> gameid = header[:6]
Traceback (most recent call last):
 File "<string>", line 301, in runcode
 File "<interactive input>", line 1, in <module>
NameError: name 'header' is not defined

#Fix it
>>> header = 'Hello world'
>>> gameid = header[:6]
>>> gameid
'Hello '

>>> header[6:11]
'world'

[:6] is Slice notation sequence[start:stop:step]

Line 23:

>>> import re 

>>> gameid = 'hello world'
>>> match = re.search(r'\w+', gameid)
>>> match 
<_sre.SRE_Match object; span=(0, 5), match='hello'>
>>> bool(match)
True
>>> if match:
...     print('if True i run')
...     
if True i run

It's a good tool to use,and you can use it when you study the basic of Python.