Hi,
I'm new to Python and I've found something in its interpreter that I
don't quite understand, and I don't really know how to correctly
formulate a search query. Here's the question.
If we have a file module_a.py with the following content:
| #!/usr/bin/env python
|
| value = 'initial'
|
| def change_value():
| global value
| value = 'changed'
and a file module_b.py:
| #!/usr/bin/env python
|
| from module_a import value, change_value
|
| change_value()
| print value
Then, if we run module_b.py, it will print "initial". However, if one
adds to the end of module_a.py this line:
| change_value()
The script module_b.py will print "changed".
It seems that in the first case change_value() called in module_b.py
ignores the global statement. Is it so? Why? What happens in the second
case? I really don't get it.
Thanks!
Cheers,
Valia
I'm new to Python and I've found something in its interpreter that I
don't quite understand, and I don't really know how to correctly
formulate a search query. Here's the question.
If we have a file module_a.py with the following content:
| #!/usr/bin/env python
|
| value = 'initial'
|
| def change_value():
| global value
| value = 'changed'
and a file module_b.py:
| #!/usr/bin/env python
|
| from module_a import value, change_value
|
| change_value()
| print value
Then, if we run module_b.py, it will print "initial". However, if one
adds to the end of module_a.py this line:
| change_value()
The script module_b.py will print "changed".
It seems that in the first case change_value() called in module_b.py
ignores the global statement. Is it so? Why? What happens in the second
case? I really don't get it.
Thanks!
Cheers,
Valia