当您使用python 3时，可以使用flush = True
方法1
for i in range(50):
sleep(0.1)
print(“#”, end = ”, flush=True)

输出到文件
import time
import sys
f = open(“out.txt”, “a+”)
# print(‘GO’, file = f)
while True:
print(‘GO’, file = f,flush=True)
time.sleep(1)

方法2
您可以-u在运行程序时使用该选项。
python3 -u file.py

原文 https://stackoverflow.com/questions/56896710/does-time-sleep-not-work-inside-a-for-loop-with-a-print-function-using-the