Python basics-import usage
1. Import module name
#sys模块负责程序与python解释器的交互，提供了一系列的函数和变量，用于操控python的运行时环境。
import sys
print("----------------------------python Modules-------------------------")
print("命令行参数：")
#argv:实现从程序外部向程序传递参数，这里是传递文件名
for x in sys.argv:
print(x)
#获取指定模块搜索路径的字符串集合，可以将写好的模块放在得到的某个路径下，就可以在程序中import时正确找到
print("Python的路径是：",sys.path)
2. from module name import function name
Pass in the argv and path functions in the sys module. Similarly, you can use from sys import * to pass all functions in sys.
from sys import argv,path
print("----------------------------python Modules-------------------------")
print("命令行参数：")
for x in argv:
print(x)
print("Python的路径是：",path)
3. Impor module name as module alias
The module sys is aliased to s, and the following program can use s instead of sys.
import sys as s
print("----------------------------python Modules-------------------------")
print("命令行参数：")
for x in s.argv[0]:
print(x)
print("Python的路径是：",s.path)
