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I agree with most of your comment, however I don’t see how indentation would help highlight the scope of the variables when they’re used as shown in his example

• OJFord 7y ago
  GP said indentation markers - typically vertical lines rendered on the background on every line at every indentation level before the first character of code. Like this, (but the | is not in the source): def fun() | return 'blah' class Foo: | def __init__(self): | | return None Often it'll be a more subtle colour than the code so it's less visually heavy than presented here. In vim I have it only shown in normal mode, to avoid confusion while editing.