'Waiting' animation in command prompt (Python)

问题

I have a Python script which takes a long time to run. I'd quite like to have the command line output to have a little 'waiting' animation, much like the swirly circle we get in browsers for AJAX requests. Something like an output of a '\', then this is replaced by a '|', then '/', then '-', '|', etc, like the text is going round in circles. I am not sure how to replace the previous printed text in Python.

回答1:

Use \r and print-without-newline (that is, suffix with a comma):

animation = "|/-\\"
idx = 0
while thing_not_complete():
    print animation[idx % len(animation)] + "\r",
    idx += 1
    time.sleep(0.1)

For Python 3, use this print syntax:

print(animation[idx % len(animation)], end="\r")

回答2:

Just another pretty variant

import time

bar = [
    " [=     ]",
    " [ =    ]",
    " [  =   ]",
    " [   =  ]",
    " [    = ]",
    " [     =]",
    " [    = ]",
    " [   =  ]",
    " [  =   ]",
    " [ =    ]",
]
i = 0

while True:
    print(bar[i % len(bar)], end="\r")
    time.sleep(.2)
    i += 1

回答3:

Python's built-in curses package contains utilities for controlling what is printed to a terminal screen.

来源：https://stackoverflow.com/questions/7039114/waiting-animation-in-command-prompt-python