My e-Notes about DataScience, Machine Learning, Python, Data Analytics, DataStage, DWH and ETL Concepts


Wednesday, 20 January 2016

Import your own python library

How to use your own written functions or routines when code in python??

Follow below steps for auto import - 
1. Create a folder where you can put all reusable code/function/routines files
2. Let's say it is "routines"
3. Now suppose, you have written all your functions and save it in a file and saved it in routines folder
4. Add routines folder path to your windows path or linux path
for linux:
Edit your .bash_profile (typically towards the end)to the following line
export PYTHON_PATH=$PYTHON_PATH:'/path/to/folder/'   #if you have this variable
export PATH=$PATH:'/path/to/folder/'   #else use  this line

 where you put the correct path in the appropriate location

Follow below steps for manual import -
Use below python code to manually import the module file

How to use your function in your code:-
1.  import that module into your python script session with a command like
import myfunc

2.  for using a function "my_sqrt" from your library myfunc
x = myfunc.my_sqrt(val)

3.  you can create alias for your library also
import myfunc as mf
x = mf.my_sqrt(val)

If want to import a particular peice from library, use as
from myfunc import my_sqrt
x = my_sqrt(val)

this is tedious if you have to import multiple so use as
from myfunc import *
x = my_sqrt(val)

But, remember if you are import multiple library and they having same function name.
While using, you need to call them as step 2

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