[EMAIL PROTECTED] a écrit :
> I don't understand what I don't understand in the following:
You already have the answer (hint: a Python module is sequentially
executed when loaded by the interpreter)
Just a couple side notes:
> # but I need locations, so this is impure, 11-line, Python:
>
> line_ptr = 0
> for line in text:
> output = ''
> char_ptr = 0
>
> for char in line:
> output += char
> char_ptr += 1
>
> print output,
> line_ptr += 1
Use enumerate and a for loop.
for line_ptr, line in enumerate(text):
for char_ptr, char in enumerate(line):
print "char %s of line %s is %s" % (char_ptr, line_ptr, char)
> # with a Loc object, 10 lines (not counting the Loc class):
>
> loc = Loc(0,0) # Name error: name 'Loc' is not defined
Indeed. It is not yet defined at this time. Remember that in Python,
almost everything happens at runtime.
(snip)
I think you're going to have a hard time if you don't read about
Python's object model...
> class Loc:
Better to use new-style classes unless you have compelling reasons to
stick with the very outdated 'classic' model.
class Loc(object):
> line = 0
> char = 0
This define two class attributes - that is, attributes that are members
of the Loc class object (*not* Loc instances), and so are shared by all
instances. This is probably not what you want.
> def __init__(self, l, c):
> line = l
> char = c
This defines two local variables line and char, bind them to resp. l and
c, then returns - discarding locals of course.
The use of 'self' is *not* optional in Python. Within the function, it's
a reference to the current instance. If you want to define instance
attributes, you have to set these attributes on the current instance.
def __init__(self, line, char):
self.line = line
self.char = char
> def nextChar(self):
> char += 1
NameError here. You want self.char
> def nextLine(self):
> line += 1
NameError here. You want self.line
> char = 0
Local variable, discarded when exiting the function. You want self.char
> def repr(self):
> return 'Loc: line='+str(line)+', char='+str(char)
NameError * 2, etc...
Also, Python has string formatting:
def __repr__(self):
return "<Loc: line=%s - char=%s>" % (self.line, self.char)
HTH
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