[Tutor] Setting a global variable on class initialisation

Tim Golden tim.golden at viacom-outdoor.co.uk
Thu Apr 27 17:22:11 CEST 2006

[Max Russell]

| I know that overall Global variables are  bad idea, however, 
| I have a situation where on on initialisation of a class, I 
| need to read in two files and then populate two lists.
| The lists need to would appear to need to be outwith the 
| class I am working with and global.
| Can anyone give good examples of this?

Well, in simple terms this *sounds* like what
you're trying to do (not attempting any more
Python approach at this juncture):

l1 = []
l2 = []

class X:
  def __init__ (self, filename1, filename2):
    l1.extend (open (filename1).readlines ())
    l2.extend (open (filename2).readlines ())

if __name__ == '__main__':
  open ("test1.txt", "w").write ("hello\nworld\n")
  open ("test2.txt", "w").write ("goodbye\nworld\n")
  x = X ("test1.txt", "test2.txt")
  print l1
  print l2


Obviously this code doesn't do anything terribly
useful, but I wanted to see if it was more-or-less
what you had in mind?


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