Python sys module ### in the acquisition parameters ###

sys module: Full System, refers to the interpreter (os refers to the operating system)
common operations, the system for receiving an operating system call parameters passed interpreter

1.sys.argv # script to get all the parameters passed, returns a list; the parameters of all elements in the list are the script passed
sys.argv [0] # Get the first argument passed footsteps; fixed script name
sys. argv [1] # Get the second parameter passed pace
may be obtained by passing the script parameters indexed manner
2.sys.version interpreter version information, it returns a string
effect: the preparation of python conforming to different versions of the program version make the program compatible

import sys
import  os
print(sys.version)
运行：
3.6.4 (default, Aug 10 2018, 11:14:49) 
[GCC 4.8.5 20150623 (Red Hat 4.8.5-11)]

It may also be explained by the characteristics of the version number string slice

import sys
import  os
print(sys.version)
print(sys.version[:5])
运行：
3.6.4 (default, Aug 10 2018, 11:14:49) 
[GCC 4.8.5 20150623 (Red Hat 4.8.5-11)]
3.6.4

3, sys.path # return the module search path, use the PYTHONPATH environment variable initialization

import os
import sys
print(sys.path)
运行：
['/home/kiosk/PycharmProjects/20190523/20190524', '/home/kiosk/PycharmProjects/20190523', '/usr/local/python3/lib/python36.zip', '/usr/local/python3/lib/python3.6', '/usr/local/python3/lib/python3.6/lib-dynload', '/usr/local/python3/lib/python3.6/site-packages', '/usr/local/python3/lib/python3.6/site-packages/Twisted-17.1.0-py3.6-linux-x86_64.egg', '/usr/local/python3/lib/python3.6/site-packages/Automat-0.7.0-py3.6.egg', '/usr/local/python3/lib/python3.6/site-packages/constantly-15.1.0-py3.6.egg', '/usr/local/python3/lib/python3.6/site-packages/zope.interface-4.5.0-py3.6-linux-x86_64.egg', '/usr/local/python3/lib/python3.6/site-packages/attrs-18.2.0-py3.6.egg']

4.sys.platform # can achieve cross-platform

import sys
import  os
# print(sys.version)
# print(sys.version[:5])
# print(sys.path)
print(sys.platform)
if sys.platform == 'linux':
    os.system('linux系统的命令')
else:
    os.system('其他系统的命令')

Application Exercise:
Requirements:
Scripting: compare.py run python in the command file 1 file 2 output shows the difference of the two documents at

import difflib
import sys
方法一：
parameter = sys.argv

with open(parameter[1]) as f1,open (parameter[2]) as f2:
    file1 = f1.read().splitlines(keepends=True)
    file2 = f2.read().splitlines(keepends=True)
diff = difflib.Differ()
diff_result = diff.compare(file1,file2)
print(''.join(list(diff_result)))
方法二：
if len(sys.argv) !=3:
    print(
        """
        Usage: %s 比较的文件1 比较的文件2
        """%(sys.argv[0])
    )

else:
    filename1 = sys.argv[1]
    filename2 = sys.argv[2]
    try:
        with open(filename1) as f1,open(filename2) as f2:
            content1 = f1.read().splitlines(keepends=True)
            content2 = f2.read().splitlines(keepends=True)
    except Exception as e:
        print('比较错误，错误的原因',e)
    d = difflib.HtmlDiff()
    htmlContent = d.make_file(content1,content2)
    with open('different.html','w') as f:
        f.write(htmlContent)



运行结果：
[kiosk@foundation40 20190524]$ /usr/local/python3/bin/python3 compare.py /home/kiosk/file  /home/kiosk/file1
  hello
+ 
+ mewfw4t
+ 4t5tr
+ fcdfbv
+ efr4

Python sys module ### in the acquisition parameters ###

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