exec inside a function and generator
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I need to write a custom exec function in python (for several purposes but this is not the problem here, so this custom exec which is called myExec will do exactly as exec for now).
myExec
exec
I went into this problem :
def myExec(code):
exec(code)
code = """
a = 1
print(a)
u = [a for x in range(3)]
print(u)
"""
myExec(code)
def myExec(code):
exec(code)
code = """
a = 1
print(a)
u = [a for x in range(3)]
print(u)
"""
myExec(code)
Running this program gives
1
Traceback (most recent call last):
File "___.py", line 12, in module
myExec(code)
File "___.py", line 2, in myExec
exec(code, globals(), locals())
File " string ", line 4, in module
File " string ", line 4, in listcomp
NameError: name 'a' is not defined
1
Traceback (most recent call last):
File "___.py", line 12, in module
myExec(code)
File "___.py", line 2, in myExec
exec(code, globals(), locals())
File " string ", line 4, in module
File " string ", line 4, in listcomp
NameError: name 'a' is not defined
So print(a) went without any problems. But the error occurs with the line u = [a for x in range(3)]. When the generator object is converted into a list, the name a seems undefined.
print(a)
u = [a for x in range(3)]
a
Note that if the line were u = [a, a, a], then, no error is raised. Nor if we use exec instead of myExec.
u = [a, a, a]
exec
myExec
Any reason why and how to solve this ?
Tags: python,generator,execSource of the question:
https://stackoverflow.com/questions/7...
Question and source license information:
https://meta.stackexchange.com/help/l...
https://stackoverflow.com/