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Дата изменения: Mon Apr 4 13:47:52 2016 Дата индексирования: Sun Apr 10 06:23:49 2016 Кодировка: ISO8859-5 Поисковые слова: south pole |
If you try to run most of my scripts by typing something like:
python <name of some script>
you will more likely than not find that absolutely nothing happens. The reason is that essentially all of the are designed to only provide functions and commands that do something useful, but they do not actually start these commands.
This applies even to top-level scripts which analyse whole data set –
quite often they provide an analyse()
or some such command, but
they do not actually invoke it.
The reason for such design is that the scripts are designed for
interactive use within Python. What you are supposed to do is to
start python interpreter, load up the script using the execfile
command, e.g.,
execfile("<name of script.py>")
and then continue in Python to use the commands defined by the script,
maybe for example calling a analyse()
function.
The standard Python command for getting help is help
(no surprise
there!). It will give the list of parameters that a function takes and
any documentation that it has. Use this command first to find out
about something that you do not know about.
Besides help, the other useful command is dir
which lists all of
the member variables and functions that an object has. This is a
potentially powerful way of discovering everything that you can do
with an object.
import
and execfile
ТЖGenerally I do not recommend my top-level scripts are imported
-ed,
but rather they should be execfile
-d. These commands are not the
same!
import
is designed for loading modules and if you import
the
same file twice it will only by read in once. This is an
intentional design feature (to improve performance of large Python
application) and means import
is only appropriate for loading
slowly changing modules. If you really need to update a module loaded
with import
then you should use the reload()
function.