On 01/05/2013 02:30 AM, Dave Angel wrote:
from opengl import gl, glu, glut
gl.rotate(...)
gl.clear(gl.COLOR_BUFFER_BIT)
Erhm, that's the same as above. Is that what you meant to write?
No, it's not the same; here he did not capitalize the function names.
Previously they look like class instantiations.
Ah, you're right. Sorry :-)
Well, I'm sometimes a bit annoyed that python doesn't give as many
warnings/errors as one gets in C - for instance sometimes I copy/paste
and forget to remove the trailing semi-colons.
Trailing semi colons are legal in most cases. The semi-colon is a
separator between statements, when one wants to put multiple statements
on one line.
However after I began to use pylint and friends, this error will be
caught. Then sometimes I forgot to add () for function calls, which in
C would cause an error by the compiler
Actually no. In C, a function name without parentheses is also a
function pointer. Not exactly the same as a function object, though C++
gets a lot closer. But the real reason C catches that typo is that the
types most likely don't match, depending on what you meant to do with
the return value.
Ok, I think you're right. At least I find that C-compilers catches many
errors/warnings which python don't say anything about. But also C
require me to define/declarer the types of variables before I use
them... OTOH I guess I like that python is faster to code in, compared
to C...
but which python allows so one can get the object (which maybe is also
a good reason, but at least in the beginning when I learned python,
this was very annoying + confusing to me).
Function objects are enormously useful, as you get more adept at using
Python.
Ok, I'll look forward to that. Recently I had some problems with
pass-by-value vs pass-by-reference. I googled the problem and found that
by default python passes by reference. I then debugged my program and
finally found out that I should make a copy (a new object) of the
variable, before I passed it to my function. And THIS solved my problem.
But in C/C++ I think the default is to pass by value, so this error in
my program was a bit unexpected... Anyway, I feel python is a great
language for doing things much faster than I could possibly do in C/C++.
I also have on my todo-list to take my opengl-program and make it into
an executable. I mainly sit on a linux-pc but I want to distribute my
opengl program for windows (which has most users). I've found something
on google for py2app, cx_Freeze, bbfreeze and Freeze and I hope this
cross-platform thing does not cause too many problems... I tried one of
these tools a few weeks ago but I think I only succeeded with a very
simple hello-world program... Anyway, that's a problem I'll investigate
in a few months when I think/hope my opengl program is finished...
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