Detailed explanation of python custom modules

Python can add custom modules

Method one:

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']

Method two:

sys.path.append('/root/pythondiy') # This method Temporarily valid

2. Open file difference

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

3. Custom module call

vim wc.py
#!/usr/bin/python

from sys import argv

def wc(s):
    chars = len(s)
    words = len(s.split())
    lines = s.count('\n')
    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

4. Execution result

[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)

5. Import module package

# 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

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