Show HN: Cannoli – A compiler for a subset of Python written in Rust

Re:Show HN: Cannoli – A compiler for a subset of Python writ... by joncatanio on Thursday May 17, 2018 @08:41PM (#17097658)

I get the same error with your example, but this works fine (Python 3.6.4):

    exec("a = 1")
    print(a)

This will print "1".

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Re:Show HN: Cannoli – A compiler for a subset of Python writ... by yorwba on Thursday May 17, 2018 @10:33PM (#17098224)

That is because the exec runs in the global scope. When Python sees a variable that is not assigned to in the local scope, it is assumed to be a global variable, so when exec creates a new local variable, the load still fails because it looks into the globals dictionary.

But you can do this:

  def foo():
    exec("a = 1")
    return locals()['a']

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