标准类库学习笔记

1. operating system
        os, shutil
        dir(), help()

2. command and input output
        sys
        sys.argv, sys.stderr, sys.stdout

3. String Pattern Matching
        re

4. Mathematics
        math, random

5. Internet
        urllib2, smtplib

6. date and time
        datetime

7. Data Compression
        zlib

8. Performance Measurement
        timeit
        Timer

9. Quality Control
        doctest, unittest