Python-初识模块

#系统自带的模块
import sys
print(sys.path)#打印环境变量
print(sys.argv)#打印绝对路径

import os
#cmd_res = os.system("dir")#打印系统目录
cmd_res = os.popen("dir").read()
print(cmd_res)

import Day2#可直接调用其他模块,默认找当前目录下，之后就是环境变量，如果在其他目录下，把之前要导入的放在site_package下

#bytes类型编码互转
name = "我爱我家"
print(name.encode("utf-8"))
print(name.encode(encoding='utf-8').decode(encoding='utf-8'))

home = "shanghai,shenzhen,hangzhou"
print(home.encode("utf-8")

输出结果

F:pypyProjectvenvScriptspython.exe F:/py/pyProject/venv/sys_os.py
['F:\py\pyProject\venv', 'F:\py\pyProject', 'F:\py\pyProject\venv\Scripts\python37.zip', 'F:\pytools\DLLs', 'F:\pytools\lib', 'F:\pytools', 'F:\py\pyProject\venv', 'F:\py\pyProject\venv\lib\site-packages', 'F:\py\pyProject\venv\lib\site-packages\setuptools-39.1.0-py3.7.egg', 'F:\py\pyProject\venv\lib\site-packages\pip-10.0.1-py3.7.egg', 'F:\pycharm install\PyCharm 2018.2.3\helpers\pycharm_matplotlib_backend']
['F:/py/pyProject/venv/sys_os.py']
 驱动器 F 中的卷没有标签。
 卷的序列号是 014C-014D

 F:pypyProjectvenv 的目录

2018/09/15  17:21    <DIR>          .
2018/09/15  17:21    <DIR>          ..
2018/09/15  17:21    <DIR>          Include
2018/09/15  17:21    <DIR>          Lib
2018/09/15  17:21    <DIR>          Scripts
2018/09/15  17:21                74 pyvenv.cfg
2018/09/17  18:24    <DIR>          new_page
2018/09/19  16:51               572 sys_os.py
2018/09/16  20:01               553 while.py
               3 个文件          1,199 字节
               6 个目录 61,125,836,800 可用字节

b'xe6x88x91xe7x88xb1xe6x88x91xe5xaexb6'
我爱我家
b'shanghai,shenzhen,hangzhou'