How to get a continuously changing user input dependent output in the same place at command line-CodePudding

I am designing a string based game where the real time positions of characters are represented as a string as follows: -----A-----o----- I am changing the position of the character "A" based upon user keyboard inputs eg: updated position: --------A--o-----

I don't want to print the string line by line as It gets updated instead I want to modify it every time in the same place when being output in command line, as the constraint I am working with is :

The entire game map should run on a single line on the command line - changing the state of the game should not spawn a new line every time.

CodePudding user response：

You could use '\r' in some way. Carriage return is a control character or mechanism used to reset a device's position to the beginning of a line of text. e.g.

import time

for i in range(100):
    time.sleep(1)
    print(i, end="\r");

Example including controls

import time
import keyboard

# params
size = 20
position = 0

# game loop
while True:
    # draw
    print("", end="\r")
    for i in range(size):
        print("-" if (position != i) else "o", end="")
    # move
    if keyboard.is_pressed("left"):  
        position = position - 1
        if position < 0:
            position = 0
    elif keyboard.is_pressed("right"):  
        position = position   1
        if position >= size:
            position = size
    # delay    
    time.sleep(0.1)

CodePudding user response：

when printing the output use the end attribute for print statements and set it as "\r" to get back the output position to starting of the line.