[Python] Why is global not incrementing in functions (Python)?

This code does not work properly:

def anyFunction(var):
for i in range(3):
try:
exec(var+"+=1")
except NameError:
exec("global "+var+"\n"+var+"=1"
return var

anyFunction("varInput")
print(varInput)


varInput should be 3, but is 1. For the code to work, you need to add a global like this :

def anyFunction(var):
for i in range(3):
try:
exec("global "+var+"\n"+var+"+=1")
except NameError:
exec("global "+var+"\n"+var+"=1"
return var

anyFunction("varInput")
print(varInput)


Does anyone know if this is a Python bug or is intended ?

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