Global issues

[jasongrout]

I'm curious how this interacts with global variables inside a function inside a cell, for example:

a = 1

def f():
    global a
    a = 5

f()
print(a)

This prints out 5 with the current ipykernel, which is what I would expect.

[davidbrochart]

With akernel this prints out 1, unless:

• we also define a as global outside of the function:

global a
a = 1

def f():
    global a
    a = 5

f()
print(a)

• or the cell is divided in two:

# cell 1
a = 1

# cell 2
def f():
    global a
    a = 5

f()
print(a)

• or we use nonlocal instead of global:

a = 1

def f():
    nonlocal a
    a = 5

f()
print(a)

[davidbrochart]

I'm thinking we could parse the code and look for top-level assignments, and declare every assigned variable as global.
Thanks for raising this issue @jasongrout !