Python SYS Modules

Topics:

1. SYS Modules
2. Using Sys argv
3. Sys argv - Guessing Game

1. SYS Modules

The sys module provides functions and variables used to manipulate different parts of the Python runtime environment.
sys.argv
sys.argv returns a list of command line arguments passed to a Python script. The item at index 0 in this list is always the name of the script. The rest of the arguments are stored at the subsequent indices.

import sys

print("You entered: ",sys.argv[1], sys.argv[2], sys.argv[3])

C:\python36> python test.py Python C# Java
>>>You entered: Python C# Java

sys.exit
This causes the script to exit back to either the Python console or the command prompt. This is generally used to safely exit from the program in case of generation of an exception.

import sys

sys.exit

sys.maxsize
Returns the largest integer a variable can take.

import sys

sys.maxsize
>>>9223372036854775807

sys.path
This is an environment variable that is a search path for all Python modules.

import sys

sys.path
>>>['', 'C:\\python36\\Lib\\idlelib', 'C:\\python36\\python36.zip', 
'C:\\python36\\DLLs', 'C:\\python36\\lib', 'C:\\python36',
'C:\\Users\\acer\\AppData\\Roaming\\Python\\Python36\\site-packages', 
'C:\\python36\\lib\\site-packages']

sys.version
This attribute displays a string containing the version number of the current Python interpreter.

import sys

sys.version
>>>'3.7.0 (v3.7.0:f59c0932b4, Mar 28 2018, 17:00:18) [MSC v.1900 64 bit (AMD64)]'

sys.executable
Prints the absolute path of the python interpreter binary.

import sys

sys.executable
>>>'/usr/bin/python3'

sys.platform
Prints the os platform type. This function will be very useful when you run your program as a platform dependent.

import sys

sys.platform
>>>'linux'

2. Using Sys argv

>>Return to Menu

import sys

first = sys.argv[1]
second = sys.argv[2]
print(f"Welcome, {first} {second}")

3. Sys argv - Guessing Game

>>Return to Menu

from random import randint
import sys

answer = randint(int(sys.argv[1]), int(sys.argv[2]))
while True:
    try:
        guess = int(input(f'guess a number {sys.argv[1]}~{sys.argv[2]}:  '))
        if  0 < guess < 11:
            if guess == answer:
                print('you are a genius!')
                break
        else:
            print('hey bozo, I said 1~10')
    except ValueError:
        print('please enter a number')
        continue

#End

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#29 - Python SYS Modules

By Ifeanyi Omeata