Miscellaneous

Part I: Module

1. Import a source file created by ourselves but it’s not in the current working directory

   • append the target working directory into system path

   • # Example
     import sys 
     sys.path.append('/Users/lei/Desktop')
     import mymax   # mymax is self-defined function stored in Desktop
     mymax.mymax(1,5)

2. List all local packages

   • import pip # needed to use the pip functions 
     for i in pip.get_installed_distributions(local_only=True):
         print(i)

3. more

Part II: Data structure

1. When copy a sequence, such as list, tuple, string, integer, etc, use the slicing operation to make a copy. Since copy a sequence is only pointing to a directory where the original sequence is stored. If the original sequence is changed, the copied sequence will also be updated.

   • new_list = list[:]

2. more