python MODULES

Jan 27, 2013 04:25 PM

>>> import sys    # imports al the system modules

>>> sys.path   #  shows the paths to the system modules as a list of paths.

note:  all on the default path:  C:\Python27

['', 'C:\Python27\Lib\idlelib', 'C:\Python27\python27.zip', 'C:\Python27\DLLs', 'C:\Python27\lib', 'C:\Python27\lib\plat-win', 'C:\Python27\lib\lib-tk', 'C:\Python27', 'C:\Python27\lib\site-packages']

>>> import math  # import is a reserved word  (a command)e the math fx are.

0.5403023058681397

>>> from math import cos

>>> cos(1)

0.5403023058681397

>>> from math import cos

>>> from math import sin

>>> sin(1)2 + cos(1)2

0.9999999999999999

Keep directory Python27 open and on monitor 4;  when you run a module, you may see

a file like  Hello.pyc   (a compiled version of the file)... you can safely delete it.

Note: do not name modules with the same name as functions...

it will cause ENDLESS CONFUSION;

here's a script in the module Hello.py  

a='Sean'

def Hellospec():

   print 'Hello', a, ":now go away blablablabbity"

to open the module you can do  

import Hello... then, to invoke a function, you must do

>>> from Hello import Hellospec  OR

you could invoke Hellospec  by 

>>> Hello.Hellospec()  OR just do

>>> from Hello import *   # there * is a wildcard, meaning  import all the functions from Hello.

>>> # the way Sean works is to create a module for each project... module1.py

and to test it, then hit f5 from within module 1  (ie from the script window)

>>> # the other way is to work within the interpreter, and to import...

>>>  import Module1   ...# no parens  or

>>>  reload (Module1)  ... # reload does take parens...

python MODULES

and to test it, then hit f5 from within module 1 &#160;(ie from the script window)

and to test it, then hit f5 from within module 1 (ie from the script window)