在while True循环内更​​改输出

Question

I am very new in Python and I decided to make a game. I want a value to be output like this:

Heat: x #x would always be changing

For that I have the following block of code:

while True:
   print("Heat: {}".format(Heat))

but all it does is spam "Heat: xHeat: xHeat: x" When it should be only one Heat bar What should I do?

Answer 1

You can use carriage return to send the cursor to the start of the line.

import sys

while True:
    sys.stdout.write("\rHeat: {}".format(Heat))
    sys.stdout.flush()

But this approach doesn't sound like you will be able to extend it into any sort of game.

You should look up the python curses library for complete control over the console output.

Also if the number of digits in your output changes then you might want to right-align the output so that you don't get any left-overs. This code demonstrates what happens if you go from a 2 digit number to a 1 digit number:

import sys
import time

for heat in reversed(range(5, 12)):
    time.sleep(0.5)

    sys.stdout.write("\rHeat: {:>5}".format(heat))
    sys.stdout.flush()

Answer 2

In that code 'Heat' in the loop and it will be printed all the time:

Heat = 0
while True:
    Heat +=1
    print ('Heat: {heat}'.format(heat=Heat))

In that code 'Heat' out of the loop and it will be printed once:

Heat = 0
print ('Heat:')
while True:
    Heat +=1
    print ('{heat}'.format(heat=Heat))

if you want more newlines use '\\n' char (strictly depends on OS).