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Bump the version number, and make a few small edits

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Andrew M. Kuchling 2007-12-14 22:52:36 +00:00
parent df2d745f38
commit 90921cc4b5
1 changed files with 15 additions and 13 deletions
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Doc/howto/functional.rst
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@ -3,7 +3,7 @@
********************************
:Author: \A. M. Kuchling
:Release: 0.30
:Release: 0.31
(This is a first draft. Please send comments/error reports/suggestions to
amk@amk.ca.)
@ -47,17 +47,19 @@ Programming languages support decomposing problems in several different ways:
functional languages include the ML family (Standard ML, OCaml, and other
variants) and Haskell.
The designers of some computer languages have chosen one approach to programming
that's emphasized. This often makes it difficult to write programs that use a
different approach. Other languages are multi-paradigm languages that support
several different approaches. Lisp, C++, and Python are multi-paradigm; you can
write programs or libraries that are largely procedural, object-oriented, or
functional in all of these languages. In a large program, different sections
might be written using different approaches; the GUI might be object-oriented
while the processing logic is procedural or functional, for example.
The designers of some computer languages choose to emphasize one
particular approach to programming. This often makes it difficult to
write programs that use a different approach. Other languages are
multi-paradigm languages that support several different approaches.
Lisp, C++, and Python are multi-paradigm; you can write programs or
libraries that are largely procedural, object-oriented, or functional
in all of these languages. In a large program, different sections
might be written using different approaches; the GUI might be
object-oriented while the processing logic is procedural or
functional, for example.
In a functional program, input flows through a set of functions. Each function
operates on its input and produces some output. Functional style frowns upon
operates on its input and produces some output. Functional style discourages
functions with side effects that modify internal state or make other changes
that aren't visible in the function's return value. Functions that have no side
effects at all are called **purely functional**. Avoiding side effects means
@ -614,7 +616,7 @@ Built-in functions
Let's look in more detail at built-in functions often used with iterators.
Two Python's built-in functions, :func:`map` and :func:`filter`, are somewhat
Two of Python's built-in functions, :func:`map` and :func:`filter`, are somewhat
obsolete; they duplicate the features of list comprehensions but return actual
lists instead of iterators.
@ -840,8 +842,8 @@ Fredrik Lundh once suggested the following set of rules for refactoring uses of
4) Convert the lambda to a def statement, using that name.
5) Remove the comment.
I really like these rules, but you're free to disagree that this lambda-free
style is better.
I really like these rules, but you're free to disagree
about whether this lambda-free style is better.
The itertools module