sys.stdout.write和sys.stdout.flush将字符留在后面

Question

I'm trying to make a counter that ticks down from 1,000,000 to 0 in increments of 100,000 per second and displays this on one line, updating each second.

However, the below code prints an extra zero at the end:

counter = 1000000

while counter > 0:
    sys.stdout.write("%s\r" % counter)
    sys.stdout.flush()
    counter -= 100000
    time.sleep(1)

I get the output (each writing over the previous line):

1000000
9000000
8000000
7000000
6000000
...

The script stops correctly at the end. When I replace \\r with \\n it prints the numbers correctly, but obviously I want it to refresh rather than create a new line each time.

Answer 1

Last character is left from the first line, as a workaround you could overwrite it manually:

while counter > 0:
    sys.stdout.write(str(counter).ljust(7) + "\r")
    counter -= 100000
    time.sleep(1)