Earl Eiland wrote:
On Thu, 2005-03-03 at 15:11, Steve Holden wrote:
Earl Eiland wrote:
I'm writing my first program where I call custom modules. The 'global'
command doesn't seem to apply, so how do I change a variable internally
in a module without passing it down n layers, and then back out again?
You are correct in assuming that global isn't what you want - it really
means "global to the module namespace in which it appears".
However, if two separate pieces of code can both reference the same
module then one can set an attribute in the module and the other can
reference it. Don't forget that when you import a module its name
becomes global within the importing module. Since a module is just a
glorified namespace, anything that can reference the module can read
and/or set that module's attributes.
a.py:
import something
something.x = "A value"
b.py:
import something
print something.x
will print "A value" as long as a is imported before b.
Right. That part I figured out. How does one function in an imported
module access a variable in the same module?
module.py
def A():
global test
test = 1
for x in range(10): B()
def B():
global test
test = test + 1
main.py
import module
module.A()
print module.test
This will fail, unless test is passed and returned.
regards
Steve
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