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Merged
terryjreedy merged 1 commit into from
Oct 13, 2021
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bpo-20692: Add Programming FAQ entry on 1.__class__ error. #28918

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21 changes: 21 additions & 0 deletions Doc/faq/programming.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -836,6 +836,27 @@ ago? ``-190 % 12 == 2`` is useful; ``-190 % 12 == -10`` is a bug waiting to
bite.


How do I get int literal attribute instead of SyntaxError?
----------------------------------------------------------

Trying to lookup an ``int`` literal attribute in the normal manner gives
a syntax error because the period is seen as a decimal point::

>>> 1.__class__
File "<stdin>", line 1
1.__class__
^
SyntaxError: invalid decimal literal

The solution is to separate the literal from the period
with either a space or parentheses.

>>> 1 .__class__
<class 'int'>
>>> (1).__class__
<class 'int'>


How do I convert a string to a number?
--------------------------------------

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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Documentation/2021-10-13-00-42-54.bpo-20692.K5rGtP.rst
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@@ -0,0 +1,2 @@
Add Programming FAQ entry explaining that int literal attribute access
requires either a space after or parentheses around the literal.