UnboundLocalError: local variable 'bar' referenced before assignment
This works, though (at least it does on 2.7):
--> exec "def foo():\n\tglobal bar\n\tbar+=1\n\treturn 1\n"
--> bar = 9
--> foo()
1
--> bar
10
Laszlo, why do you think you can't use exec?
I'm sorry, first I was not aware of the "in globals locals" part.
Then I also got an UnboundLocalError. Then I also figured out that I can
use "global bar", but I did not want to. Reason: 100 functions/second
installed to global namespace doesn't sound well. However, now I
discovered the locals parameter, and I figured out that I can force the
compiler to treat the name of the function to be a local name. I do this
by reserving its name in locals. Then the compiler has no choice but to
place it in the local namespace:
locals = {'_f_':None}
globals ={} # More specialized version in my program...
exec "def _f_(a):\n\treturn a+1\n\n" in globals,locals
print locals['_f_'](4) # prints '5'
This is good because it is not interfering with module level globals(),
nor the local namespace. Also good because I can restrict what is
visible from inside the function.
Thank you for your help.
Best,
Laszlo
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