[Python] How to refresh the multi-line output dynamically

I want to refresh some info dynamically(just like progress bar), I can do it with following code

#! /usr/bin/env python
import sys
import time

print "start the output"
def loop():
i = 0

while 1:
i += 1
output = "\rFirst_line%s..." % str(i)
sys.stdout.write(output)
sys.stdout.flush()
time.sleep(1)
loop()


It could only output single_line info dynamically, When add '\n' into output, It couldn't work as expect.

output = "\rFirst_line%s...\n" % str(i)


Any way could help it to refresh multi_line content?

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