Programming Python

2 System Programming

• System scripting overview
• Intruducing sys Module
• Introducing os Module

System Scripting Overview

• dir, dir(sys), dir(os), dir(os.path)
• import, import sys, import os
• sys.__doc__, print(sys.__doc__)
• help(sys)
• >>> line = 'aaa\nbbb\nccc\n' >>> line.split('\n') ['aaa', 'bbb', 'ccc', ''] >>> line.splitlines() ['aaa', 'bbb', 'ccc']
• String Method Basics
• mystr.find('XXX'), >>> mystr.find('SPAM') # return first offset 3
• mystr.replace('AA', 'XXX'), >>> mystr.replace('aa', 'SPAM') # global replacement 'xxSPAMxxSPAM'
• 'XXX' in mystr, >>> 'SPAM' in mystr # substring search/test True