time.sleep() 函数不起作用

Question

I'm using time.sleep() in a program but the lines seem to be running out of order. Here is the code:

print("Line 1")
time.sleep(1)
print("Line 2")
time.sleep(1)
print("Line 3")
time.sleep(1)

And it runs like this:

(waits) Line 1 Line 2 (waits) Line 3

Instead of:

Line 1 (waits) Line 2 (waits) Line 3 (waits)

I've had this problem with a lot of programs that I use this function for, never really found a fix. Any suggestions?

Answer 1

Try running without output buffering, ie python -u foo.py . You can also try to call sys.stdout.flush() after every print , just to test it.

Answer 2

Instead of time.sleep() , use sleep() :

from time import sleep
print("Line 1")
sleep(1)
print("Line 2")
sleep(1)
print("Line 3")
sleep(1)