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Update lambda description to reflect nested scopes. This was noted by 

Andrew Koenig.
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Fred Drake 2001-12-03 21:47:37 +00:00
parent 1a76386194
commit fcf94681ed
1 changed files with 2 additions and 4 deletions
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Doc/tut/tut.tex
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@ -1535,19 +1535,17 @@ Here's a function that returns the sum of its two arguments:
objects are required. They are syntactically restricted to a single objects are required. They are syntactically restricted to a single
expression. Semantically, they are just syntactic sugar for a normal expression. Semantically, they are just syntactic sugar for a normal
function definition. Like nested function definitions, lambda forms function definition. Like nested function definitions, lambda forms
cannot reference variables from the containing scope, but this can be can reference variables from the containing scope:
overcome through the judicious use of default argument values:
\begin{verbatim} \begin{verbatim}
>>> def make_incrementor(n): >>> def make_incrementor(n):
... return lambda x, incr=n: x+incr ... return lambda x: x + n
... ...
>>> f = make_incrementor(42) >>> f = make_incrementor(42)
>>> f(0) >>> f(0)
42 42
>>> f(1) >>> f(1)
43 43
>>>
\end{verbatim} \end{verbatim}