我想更好地理解这段代码

Question

import sys
import time
command=""
started=False
while True:
    name=input("Enter your name! ")
    if name!="":
        break
if len(name)<3:
    print("name's too short ")
    time.sleep(1)
    exit()
answer=input(f"Hello {name} do you want to play my game! ").lower()
if answer== "yes":
    while command!=("quit"):
        command=input("press 's' to start, p to pause or q to quit ").lower()
        if command==("s"):
            if started:
                print('car already started')
            else:
                started=True
                print("car started")
        elif command==("p"):
            if not started:
                print('car already stopped')
            else:
                started=False
                print("car stopped")
                
        elif command==("q"):
                        print("game ended")
                        time.sleep(2)
                        exit()
        else:
            print(" i dont understand")

When I run this code and I press 's' to start I get 'car started' and when I tried pressing 's' again I get car already started but I got confused at "started=True Print("car started")". I was wondering since started is set to True shouldn't the print statement be ("car already started") although the program is working good but when looking at the code I am just a bit confused and please I would need a bit clarification on the code.

Answer 1

As you are confused about the started = True part, I will try and focus on that mainly.

What the if started condition does is checks if you have already typed s beforehand. If you have, ie if started , then print('car already started') runs.

You may be confused about the if statement not having a condition, ie if started . This is just a shorthand for writing if started == True , as an if statement evaluates the condition based on True or False .

Once the user has typed s and hasn't typed s before, the boolean started is set to True (previously False) and print("car started") runs. This ensures that the next time you type s , the if statement runs again, and since if started is true, print('car already started') runs.

The if not statement checks the opposite, ie if not started means the same thing as if started == False .