[issue21014] `1` => `True`; for tutorial docs

[Roundup Robot]

Roundup Robot added the comment:

New changeset deb71529aad1 by Raymond Hettinger in branch '3.4':
Issue 21014:  Use booleans instead of 0 and 1 in examples.
http://hg.python.org/cpython/rev/deb71529aad1

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nosy: +python-dev

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21014>
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