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Diffstat (limited to 'Doc/faq')
| -rw-r--r-- | Doc/faq/programming.rst | 18 |
1 files changed, 10 insertions, 8 deletions
diff --git a/Doc/faq/programming.rst b/Doc/faq/programming.rst index 8fc7666..3c9e5f4 100644 --- a/Doc/faq/programming.rst +++ b/Doc/faq/programming.rst @@ -182,7 +182,7 @@ Note that the functionally-oriented builtins such as :func:`map`, :func:`zip`, and friends can be a convenient accelerator for loops that perform a single task. For example to pair the elements of two lists together:: - >>> list(zip([1,2,3], [4,5,6])) + >>> list(zip([1, 2, 3], [4, 5, 6])) [(1, 4), (2, 5), (3, 6)] or to compute a number of sines:: @@ -192,14 +192,16 @@ or to compute a number of sines:: The operation completes very quickly in such cases. -Other examples include the ``join()`` and ``split()`` methods of string objects. +Other examples include the ``join()`` and ``split()`` :ref:`methods +of string objects <string-methods>`. + For example if s1..s7 are large (10K+) strings then ``"".join([s1,s2,s3,s4,s5,s6,s7])`` may be far faster than the more obvious ``s1+s2+s3+s4+s5+s6+s7``, since the "summation" will compute many subexpressions, whereas ``join()`` does all the copying in one pass. For -manipulating strings, use the ``replace()`` and the ``format()`` methods on -string objects. Use regular expressions only when you're not dealing with -constant string patterns. +manipulating strings, use the ``replace()`` and the ``format()`` :ref:`methods +on string objects <string-methods>`. Use regular expressions only when you're +not dealing with constant string patterns. Be sure to use the :meth:`list.sort` builtin method to do sorting, and see the `sorting mini-HOWTO <http://wiki.python.org/moin/HowTo/Sorting>`_ for examples @@ -414,8 +416,8 @@ It's good practice if you import modules in the following order: Never use relative package imports. If you're writing code that's in the ``package.sub.m1`` module and want to import ``package.sub.m2``, do not just -write ``from . import m2``, even though it's legal. Write ``from package.sub import -m2`` instead. See :pep:`328` for details. +write ``from . import m2``, even though it's legal. Write ``from package.sub +import m2`` instead. See :pep:`328` for details. It is sometimes necessary to move imports to a function or class to avoid problems with circular imports. Gordon McMillan says: @@ -860,7 +862,7 @@ To convert, e.g., the number 144 to the string '144', use the built-in type constructor :func:`str`. If you want a hexadecimal or octal representation, use the built-in functions :func:`hex` or :func:`oct`. For fancy formatting, see the :ref:`string-formatting` section, e.g. ``"{:04d}".format(144)`` yields -``'0144'`` and ``"{:.3f}" % (1/3)`` yields ``'0.333'``. +``'0144'`` and ``"{:.3f}".format(1/3)`` yields ``'0.333'``. How do I modify a string in place? |