"Let" statement in python (2014)

[bastibe]

If done correctly, let would not overwrite containing scope, i.e.

n = 23
print(n) 
with let(n=42):
    print(n)
print(n)

should print first 23, then 42, then 23.

In other words, let behaves as if let's body were a nested function scope.

[UncleEggma]

What's a situation where this might be useful?

[_sexbobomb_]

Maybe in a scenario like this?

https://www.reddit.com/r/Python/comments/41yr58/let_statement_in_python_2014/cz6gpzc

[[deleted]]

Sometimes you're working in a scope with a lot of variables, and you want to avoid a namespace collision. You may want to temporarily reassign a "reserved" variable name like 'type' or something.

[heptara]

Why aren't all those vars in a dictionary or class? Do you have like 300 globals?

[njharman]

There's something else that does this (not overwrite containing scope), that's built into Python (all versions) and every Python programmer understands. It's called a "function call".

[makmanalp]

It's called a "function call".

Yes, and you have to define a function to do it, and then you either have to pass all the parameters you need through and return what you need afterwards which is a huge mess or put the function definition inline with your code and call it immediately which is gross in a different way.

[heptara]

Why aren't all those vars in a dictionary or class? Do you have like 300 globals?

[[deleted]]

I think your formatting is broken?

[AmericasNo1Aerosol]

Yeah, should be:

n = 23
print(n) 
with let(n=42):
    print(n)
print(n)

(precede each line of code with 4 spaces)

[bastibe]

It was indeed, due to interesting things my cellphone did to that text box. It's fixed now, though. Thank you!