Sample code for the article on closures

[lpozo]

Where to put new files:

• New files should go into a top-level subfolder, named after the article slug. For example: my-awesome-article

How to merge your changes:

1. Make sure the CI code style tests all pass (+ run the automatic code formatter if necessary).
2. Find an RP Team member on Slack and ask them to review & approve your PR.
3. Once the PR has one positive ("approved") review, GitHub lets you merge the PR.
4. 🎉

[bzaczynski]

⚠️ Fact Check

@lpozo Actually, I just realized this is the wrong syntax for a lambda expression. This is the correct one:

Suggested change

	return lambda name=name: print(f"Hello, {name}!")
	return lambda name: print(f"Hello, {name}!")

Unfortunately, this mistake is also present in the tutorial text.

[lpozo]

It doesn't work if we don't set the argument:

>>> def outer_func():
...     name = "Pythonista"
...     return lambda name: print(f"Hello, {name}!")
...     
... 
>>> func = outer_func()
>>> func()
Traceback (most recent call last):
  File "<input>", line 1, in <module>
    func()
TypeError: outer_func.<locals>.<lambda>() missing 1 required positional argument: 'func'

[lpozo]

The correct syntax is:

>>> def outer_func():
...     name = "Pythonista"
...     return lambda: print(f"Hello, {name}!")
...     
... 
>>> func = outer_func()
>>> func()
Hello, Pythonista!

[bzaczynski]

@lpozo There's one small detail to fix in the lambda expression example (same in the tutorial text.)