Pass Variables Into And Out Of Exec [closed For Not Being Clear. Modified And Reuploaded]

Given the following code a = 100 b = 200 snip = ''' c = a+b ''' exec(snip) print(c) how can I pass values into exec, and get values out of exec, without using global scope? In e

Solution 1:

Generally, global scope is used with exec

a = 100
b = 200

snip = '''
c = a+b
'''exec(snip)
print(c)

However, this can be problematic in some use cases. exec allows you to pass in a dictionary defining the global scope, and receive a dictionary containing the local scope. Here's an example:

snip = '''
c = a+b
'''

input_globals = {'a': 100, 'b': 2}
output_locals = {}

exec(snip, input_globals, output_locals)
print(output_locals)

This results in the following output:

{'c': 102}

this effectively allows one to use exec "functionally", without working on and modifying global scope.

You can read this for more detail.