[issue10488] Improve documentation for 'float' built-in.

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

Updated patch:

 - add some examples
 - mention __float__
 - mention that large numeric arguments can result in an OverflowError

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Added file: http://bugs.python.org/file19744/float_builtin_doc_v2.patch

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<http://bugs.python.org/issue10488>
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