Description of the issue

See Loop variable capture:
https://lgtm.com/rules/7890089/

Recommendation

The simplest way to fix this problem is to add a local variable of the same name as the outer variable and initialize that using the outer variable as a default. for var in seq: ... def inner_func(arg): ... use(var) becomes for var in seq: ... def inner_func(arg, var=var): ... use(var)`

I think the code at the end of the paragraph is not supposed to be a one-liner. It should span multiple lines, with crucial but missing indentation.