I have a string variable containing a function. the function looks like this:
def program():
x[0] = y[1]
z[0] = x[0]
out = z[0]
This is within a method:
def runExec(self, stringCode):
x = [1,2,3,4]
y = [5,6,7,8]
z = [6,7,8,9]
exec stringCode
return out
I am receiving a NameError, it seems x, y and z are not accessible from the stringCode exec ?
How can I make these variables accessible, do I have to pass them in some way ?
Thanks
Assuming you have a good reason to use exec, which is an assumption you should double-check.
You need to supply the global and local scope for the exec function. Also, the "program" string needs to actually run instead of just defining a function. This will work:
prog = """
x[0] = y[1]
z[0] = x[0]
out = z[0]
"""
def runExec(stringCode):
x = [1,2,3,4]
y = [5,6,7,8]
z = [6,7,8,9]
exec(stringCode, globals(), locals())
return out
print runExec(prog)
Why do you need to use exec? The following code should work the same way, just without exec:
def program(x, y, z):
x[0] = y[1]
z[0] = x[0]
out = z[0]
return out
def runExec(self, func):
x = [1,2,3,4]
y = [5,6,7,8]
z = [6,7,8,9]
out = func(x, y, z)
return out
self.runExec(program)
You can make them global.
global x,y,z
def runExec(self, func):
x = [1,2,3,4]
y = [5,6,7,8]
z = [6,7,8,9]
out = func(x, y, z)
return out
exec?