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Riobard Zhan wrote:
It is pretty clear that colon-supporters do not pay attention to the inconsistency of semicolons being optional and colons being mandatory
No, it is pretty clear that you do not understand the fundamental difference in semantics between colons and semi-colons. It is not an inconsistency.
Colons are used as an indicator of association: the block following the colon is strongly associated with the line containing the colon, just like in English. This reinforces the association due to indentation, and makes it more obvious in complicated cases:
if (some very complicated statement) or (another big statement which goes over many lines) or clause: do something here else: do something else
Semi-colons are used as a separator, and they are designed for one-liners. They are permitted in multi-line programs only because there is no need to bother forbidding them, but they are completely redundant if followed by a line break instead of another statement.
x = 1; y = 2 # the semi-colon is useful
x = 1; y = 2 # the semi-colon is useless line noise
Because colons are used for a very different thing than semi-colons, any inconsistency between the rules for one and the rules for the other is imaginary. Different purposes, different rules.