Test integer literals

Author: sanxiyn

tests/snippets/literals.py

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+# Integer literals
+assert 0b101010 == 42
+assert 0B101010 == 42
+assert 0o777 == 511
+assert 0O777 == 511
+assert 0xcafebabe == 3405691582
+assert 0Xcafebabe == 3405691582
+assert 0xCAFEBABE == 3405691582