> Here is what i have tried so far without much success.Please ignore any Python doesn't have such a thing, unless you consider builtins. > I'm trying to understand using global variable across different modules. The less coupling there is between modules the easier it is to understand and test.įrom davea at davea.name Wed Sep 11 16:02:32 2013 A significant advantage of not using globals (except for system wide constants) is that is makes testing of individual modules easier. > Also remember that accessing any form of global that is shared between multiple threads is a recipe for disaster unless appropriate locks are used. On the other hand I appreciate simple constant assignments should be easy enough to change without needing to know any Python. Thus users without python experience might find it easier to change them without having to look at any python code. Later the constructor could be changed to read the constants from an initialisation file of your own format (e.g.ini or JSON). Also if the constants are put inside a class, possibly with getter methods, instantiated as a singleton then initially the values can be typed directly into the preferences file. It is good in that system wide constants are defined in one place only. > As to global usage I do find it useful to have a file called something like 'preferences.py' and put in there constants to be used throughout the application. > would only change stdout in the current module and sys.stdout would remain unchanged. > Thus assigning to sys.stdout would change the standard out destination in every module importing sys whereas > (the latter being a convenience to avoid having to write sys. > That being the case it would be wrong to assume that the following are identical > I take it then that assigning to Debug_Value in Test2.py will not change the value of Debug_Value in Test1.py. Just wasted space in each copy of the message (where space is money).īut next time it might lead to indentation problems and otherįrom johnhpote at o2.co.uk Wed Sep 11 20:10:07 2013 Try fixing your email program to use text, not html.
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