#16862: merge with 3.3.

This commit is contained in:
Ezio Melotti 2013-01-05 07:38:52 +02:00
commit a2f959169a
1 changed files with 3 additions and 6 deletions

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@ -214,7 +214,7 @@ The major reason is history. Functions were used for those operations that were
generic for a group of types and which were intended to work even for objects
that didn't have methods at all (e.g. tuples). It is also convenient to have a
function that can readily be applied to an amorphous collection of objects when
you use the functional features of Python (``map()``, ``apply()`` et al).
you use the functional features of Python (``map()``, ``zip()`` et al).
In fact, implementing ``len()``, ``max()``, ``min()`` as a built-in function is
actually less code than implementing them as methods for each type. One can
@ -345,9 +345,6 @@ support for C.
Answer 2: Fortunately, there is `Stackless Python <http://www.stackless.com>`_,
which has a completely redesigned interpreter loop that avoids the C stack.
It's still experimental but looks very promising. Although it is binary
compatible with standard Python, it's still unclear whether Stackless will make
it into the core -- maybe it's just too revolutionary.
Why can't lambda forms contain statements?
@ -709,7 +706,7 @@ of each call to the function, and return the cached value if the same value is
requested again. This is called "memoizing", and can be implemented like this::
# Callers will never provide a third parameter for this function.
def expensive (arg1, arg2, _cache={}):
def expensive(arg1, arg2, _cache={}):
if (arg1, arg2) in _cache:
return _cache[(arg1, arg2)]
@ -734,7 +731,7 @@ languages. For example::
try:
...
if (condition): raise label() # goto label
if condition: raise label() # goto label
...
except label: # where to goto
pass