Have a good habit on programming

There are some tips on writing program:

1. Try to give the objects some meaningful names, like when I create a list containing a list of fruit. Then we cab type: fruit=['kiwi','orange','pear'], instead b=['kiwi','orange','pear'].

2. Give the files some handles before reading them in, like:

file1="aaa.txt"

file2="bbb.txt"

So when you change the file names to be read in, just change the handles.

3. When a piece of code is repeatedly used, we can code them into functions, or classes etc.