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I would like to define globals in a "programmatic" way. Something similar to what I want to do would be:
definitions = {'a': 1, 'b': 2, 'c': 123.4} for definition in definitions.items(): exec("%s = %r" % definition) # a = 1, etc. Specifically, I want to create a module fundamentalconstants that contains variables that can be accessed as fundamentalconstants.electron_mass, etc., where all values are obtained through parsing a file (hence the need to do the assignments in a "programmatic" way).
Now, the exec solution above would work. But I am a little bit uneasy with it, because I'm afraid that exec is not the cleanest way to achieve the goal of setting module globals.
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The best way to share global variables across modules across a single program is to create a config module. Just import the config module in all modules of your application; the module then becomes available as a global name.
The global Keyword Normally, when you create a variable inside a function, that variable is local, and can only be used inside that function. To create a global variable inside a function, you can use the global keyword.
Creating global parameters To create a global parameter, go to the Global parameters tab in the Manage section. Select New to open the creation side-nav. In the side-nav, enter a name, select a data type, and specify the value of your parameter.
Here is a better way to do it:
import sys definitions = {'a': 1, 'b': 2, 'c': 123.4} module = sys.modules[__name__] for name, value in definitions.iteritems(): setattr(module, name, value) You can set globals in the dictionary returned by globals():
definitions = {'a': 1, 'b': 2, 'c': 123.4} for name, value in definitions.items(): globals()[name] = value If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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