On 6/24/2011 7:30 AM, Gnarlodious wrote:
On Jun 24, 12:27 am, Terry Reedy wrote:
1) Can I tell Executable.py to share Data with ModuleTest.py?
After the import is complete, yes.
import ModuleTest
ModuleTest.Data = Data
This works if the use of Data is inside a function that is not called
during import, not if the use of Data is at toplevel or in a class
statement outside a def.
That works! The solution looks like this:
# controlling program:
from Module import Data
import ModuleTest
ModuleTest.Data = Data
ModuleTest.getData()
# module:
def getData():
print(Data.Plist.Structure)
This is a form of dependency injection, where a caller injects into a
callee a dependency (callee) of the callee. It can be used even if the
callee imports a dependency when it is imported. It is useful for
testing when you want the callee to use a different dependency for
testing. Simple example:
# MyModule
import socket
def myconnect(*args):
... socket.bind()
# Test_MyModule
import mock_socket
import MyModule
MyModule.socket = mock_socket
... test of MyModule, including MyModule.myconnect
Python makes this trivial without requiring that the otherwise constant
depedency always be injected or passed (in normal production use) as a
variable.
In your case, you are free to inject different forms of Data if you wish.
--
Terry Jan Reedy
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