详解python自定义模块

echo 'export PYTHONPATH='/root/pythondiy/' >> /root/.bashrc # 此目录为你模块的路径
# 然后使用sys模块查看环境变量
import sys
sys.path # 返回一个列表
['',
 '/usr/local/bin',
 /root/pythondiy',
 '/usr/local/lib/python27.zip',
 '/usr/local/lib/python2.7',
 '/usr/local/lib/python2.7/plat-linux2',
 '/usr/local/lib/python2.7/lib-tk',
 '/usr/local/lib/python2.7/lib-old',
 '/usr/local/lib/python2.7/lib-dynload',
 '/usr/local/lib/python2.7/site-packages',
 '/usr/local/lib/python2.7/site-packages/setuptools-28.8.0-py2.7.egg',
 '/usr/local/lib/python2.7/site-packages/pip-9.0.1-py2.7.egg',
 '/usr/local/lib/python2.7/site-packages/IPython/extensions',
 '/root/.ipython']

open('/etc/passwd').read() # 返回全文的是str
open('/etc/passwd').readlines() # 返回全文的是一个list
open('/etc/passwd').readline() # 每一次读取一行，返回str

vim wc.py
#!/usr/bin/python
 
from sys import argv
 
def wc(s):
 chars = len(s)
 words = len(s.split())
 lines = s.count('
')
 return lines,words,chars
 
if __name__== '__main__': # 只有在执行此脚本时才调用函数。
 with open(argv[1]) as file1:
 print wc(file1.read())
 
vim copy_wc.py
import

[root@peng pyth]# python wc.py /etc/passwd # 返回的是passwd文件统计
(23, 31, 1066)
[root@peng pyth]# python copy_wc.py # 返回的是hosts文件统计
(2, 10, 158)

# 需要在包里创建一个__init__.py空文件，也可以是包的描述
touch __init__.py
ipython
from pyth import wc # 这样就导入一个模块包