Python 3: An interactive deep dive/

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The import Search Path

The import Search Path

We'll cover the following...

Before this goes any further, I want to briefly mention the library search path. Python looks in several places when you try to import a module. Specifically, it looks in all the directories defined in sys.path. This is just a list, and you can easily view it or modify it with standard list methods. (You’ll learn more about lists in Native Datatypes.)

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import sys                                                         #①
print (sys.path)                                                   #②
#['/usercode', 
# '/usr/lib/python3.4', 
# '/usr/lib/python3.4/plat-x86_64-linux-gnu', 
# '/usr/lib/python3.4/lib-dynload', 
# '/usr/local/lib/python3.4/dist-packages', 
# '/usr/lib/python3/dist-packages']
print (sys)                                                        #③
#<module 'sys' (built-in)>
print (sys.path.insert(0, '/home/mark/diveintopython3/examples'))  #④
#None
print (sys.path)                                                   #⑤
#['/home/mark/diveintopython3/examples', 
#'/usercode', 
#'/usr/lib/python3.4', 
#'/usr/lib/python3.4/plat-x86_64-linux-gnu', 
#'/usr/lib/python3.4/lib-dynload', 
#'/usr/local/lib/python3.4/dist-packages', 
#'/usr/lib/python3/dist-packages']

① Importing the ...