I am digging Python. I am writing small pieces of code that does one thing and does it well, kind of like building a solid, reliable Lego piece. When I have a collection of them, I can snap ’em together to make something useful. In fact, I’ve used Python to generate some content behind the wiki I built, http://www.haidongji.com/wiki
One useful thing that I wrote recently is to solve this problem: suppose you have two files, 1.txt and 2.txt, your objective is to remove lines that exist in both files from 1.txt. I came up with 4 lines of Python code (including the import statement) to solve it. I am a bit amused by this, although I don’t necessarily like this style of programming. It is clever, but can be hard to understand and maintain later on. Here is the code. Just for demo purposes, no error handling!
for line in fileinput.input(“1.txt”, inplace=1):
if line not in open(“2.txt”, “r”):
Note the comma at the end of the print statement. It is necessary, otherwise you will have extra newline characters in your file.
To create a simple test, create 1.txt with the English alphabet, with each letter occupying a line. Then create 2.txt, say with the letters in the word “haidong”, again with each letter taking a line. Run the code and see what happens.