Bug: define_macro & embed doesn't work as expected inside a method vs __main__

[kirankotari]

If I have a macro inside a function doesn't work as expected, the same is working fine on __main__ condition. Why?

Define Macro in function throws an error..!

import IPython as ipy
from IPython.terminal.interactiveshell import TerminalInteractiveShell

def run():
    shell = TerminalInteractiveShell.instance()
    shell.define_macro('foo', """a,b=10,20""")
    ipy.embed(display_banner=False)

if __name__ == "__main__":
    run()

⋊> ~/c/i/i/ipycli on master ⨯ ipython test
In [1]: foo
Out[1]: IPython.macro.Macro('a,b=10,20\n')
In [2]: a,b
---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
<ipython-input-3-2fbdd1b4fa70> in <module>
----> 1 a,b
NameError: name 'a' is not defined

Define Macro in main works fine..!

import IPython as ipy
from IPython.terminal.interactiveshell import TerminalInteractiveShell

if __name__ == "__main__":
    shell = TerminalInteractiveShell.instance()
    shell.define_macro('foo', """a,b=10,20""")
    ipy.embed(display_banner=False)

⋊> ~/c/i/i/ipycli on master ⨯ ipython test
In [1]: foo
In [2]: a,b
Out[2]: (10, 20)

IPython version 7.14.0
OS: macOS Catalina
Terminal: iTerm2 version 3.3.9

[kirankotari]

@Carreau any updates why this is happening?

[Carreau]

Sorry I didn't had a chance to look at it yet, I haven't touched macro in forever.

I'm not surprised it does nto work from within a function if it's inspecting frames ,but I'm unsure.

[Carreau]

I don't understand what you are asking and how your examples are working. You seem to be omitting some informations.

if __name__ == '__main__':
    IPython.get_ipython().define_macro('var', """a=10
b=20""")

This will fail with IPython undefined. Please provide the whole file

$ ipython test

This will not give you a prompt. You need the -i flag.

Your new variables are a=10, b=20

Where is the code that does that ?

If you provide approximative examples, or have done modification you are not telling me about it's going to be tough to understand.

[kirankotari]

@Carreau updated the question with proper code, please help
@minrk @takluyver

[kirankotari]

Got the solution, after defining the I need assign manually when I am calling the embed from function
x, y = shell.user_ns['x'], shell.user_ns['y'] before ipy.embed(display_banner=False)