Why can I not change global variables from inside a function, using exec()? It works fine when the assignment statement is outside of exec(). Here is an example of my problem:
>>> myvar = 'test'
>>> def myfunc():
... global myvar
... exec('myvar = "changed!"')
Per the docs, the
exec statement takes two optional expressions, defaulting to
locals(), and always performs changes (if any) in the
So, just be more explicit/specific/precise...:
>>> def myfunc(): ... exec('myvar="boooh!"', globals()) ... >>> myfunc() >>> myvar 'boooh!'
...and you'll be able to clobber global variables to your heart's contents.