[Package Management in Python] smart way to import modules #Python

package_management.md

Import module from different file

import file_name as fn

or

from file_name import *

The file_name above is the name of your specific .py file under the same folder of your script.

Import module from different folder

from file_path.file_name import *

We link the file_path with file_name using . rather than /.

Import module from environment path

import sys
module_path = '/absolute/path/in/system'
sys.path.append(module_path)
from file_name import *

We can import sys at first, then add file path to system path environment in python.

However, we can simplify this process by adding your module path to environment permamentally

$ export PYTHONPATH=$PYTHONPATH:/absolute/path/in/system
$ python -c "import sys; print(sys.path)

The first line add your path to environment, and the second line check the path in your environment. After this, you may just import your package with only one line at beginning.

from file_path.file_name import *