Application of python3.7 sys Module

The sys module of Python provides access to variables used or maintained by the interpreter and functions to interact with the interpreter. Generally speaking, the sys module is responsible for the interaction between the program and the python interpreter, and provides a series of functions and variables for controlling the environment of python runtime.

#!/usr/bin/env python 
__author__ = "lrtao2010" 

#python3.7 sys Module 

#sys Module is responsible for program and python The interaction of the interpreter, which provides the 1 Series of functions and variables, 
# Used for manipulation python The environment of the runtime. 

# sys.argv  Receives command line arguments, generates 1 A List , No. 1 Elements are the path of the program itself 
# sys.modules.keys()  Returns a list of all modules that have been imported 
# sys.exc_info()  Gets the exception class currently being handled ,exc_type , exc_value , exc_traceback Exception details currently handled 
# sys.exit(n)  Exit the program, when exiting normally exit(0)
# sys.hexversion  Get Python Interpret the version value of the program, 16 The binary format is as follows: 0x020403F0
# sys.version  Get Python Interpret the version information of the program 
# sys.maxint  Maximum Int Value 
# sys.maxunicode  Maximum Unicode Value 
# sys.modules  Returns the module field imported by the system, key Is the module name, value Is a module 
# sys.path  Returns the search path of the module, which is used when initializing PYTHONPATH Values of environment variables 
# sys.platform  Returns the operating system platform name 
# sys.stdout  Standard output 
# sys.stdin  Standard input 
# sys.stderr  Error output 
# sys.exc_clear()  Used to clear the current or recent error message of the current thread 
# sys.exec_prefix  Returns platform-independent python Location where files are installed 
# sys.byteorder  Indicator of the local byte rule, big-endian The value of the platform is 'big',little-endian The value of the platform is 'little'
# sys.copyright  Record python Copyright-related things 
# sys.api_version  Interpreter's C Adj. API Version 

# import sys
# my_sys = sys.argv
# for i in my_sys:
#   print(i)
# >>>python sys_module.py test test1 test2
# sys_module.py
# test
# test1
# test2
# print(sys.path)

# print(__name__)
# print(__file__)
#
# __main__
# sys_module.py


#import sys,os
# print(os.path.abspath(__file__))
# E:\python\learning\app\Module_and_Functions\sys_module.py
#print(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))

# from method import test
# test.test()
# ModuleNotFoundError: No module named 'method'

# Dynamic modification sys.path Variable 
# BASE_DIR=os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
# sys.path.append(BASE_DIR)
# from method import test
# test.test()
#
# This is test

# Real-time printout 
# import time,sys
# for i in range(20):
#   sys.stdout.write("=")
#   time.sleep(0.5)
#   sys.stdout.flush() # Screen refreshed from cache