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5
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if test1: if test2: print(x)
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6
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Also note that the semicolon binds tighter than the colon in this context, so that in the following example, either all or none of the :func:`print` calls are executed::
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7
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if x < y < z: print(x); print(y); print(z)
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8
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9
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Note that statements always end in a ``NEWLINE`` possibly followed by a ``DEDENT``. Also note that optional continuation clauses always begin with a keyword that cannot start a statement, thus there are no ambiguities (the 'dangling :keyword:`else`' problem is solved in Python by requiring nested :keyword:`if` statements to be indented).
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10
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11
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The :keyword:`if` statement
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12
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The :keyword:`if` statement is used for conditional execution:
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13
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It selects exactly one of the suites by evaluating the expressions one by one until one is found to be true (see section :ref:`booleans` for the definition of true and false); then that suite is executed (and no other part of the :keyword:`if` statement is executed or evaluated). If all expressions are false, the suite of the :keyword:`else` clause, if present, is executed.
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14
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The :keyword:`while` statement
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