在函数下没有换行符的打印在 Python 中不起作用 [英] Print without newline under function doesn't work as it should in Python

问题描述

我正在为我的上传脚本制作一个进度条，因此我想打印一行多个#"，但我无法让它工作.当我告诉 Python 不要添加换行符时，它确实删除了它，但它在函数下无法按预期工作.在 Python 3 中使用 "print ('#', end='')" 或在 Python 2 中使用 "print '#'," 将其删除，但在函数下执行时，在整个函数完成之前它不会打印任何内容，它不应该像正常打印一样等待.

I'm doing a progressbar for my uploading script and therefor i want to print a row of multiple '#' but i can't get it to work. When i tell Python to not add newline it does remove it but it doesn't work as expected under functions. Using "print ('#', end='')" in Python 3 or "print '#'," in Python 2 removes it but when executed under a functions it doesn't print anything out until the whole function is finished, it should not wait just like normal print.

import time

i = 0

def status():
    print('#', end='')

while i < 60:
    status()
    time.sleep(1)
    i += 1

这应该每秒打印 '#' 但它没有.它会在 60 秒后将它们全部打印出来.仅使用 print('#') 按预期每秒打印一次.我真的需要解决这个问题.请帮忙！

This should print '#' every second but it doesn't. It prints them all after 60 seconds. Using just print('#') prints it out every second as expected. I really need a fix for this. Please help!

解决办法:每次打印后sys.stdout.flush()":)

Solution: "sys.stdout.flush()" after each print :)

推荐答案

您可能需要在每次 print 调用后刷新输出缓冲区.请参阅如何刷新 Python 打印的输出?

You probably need to flush the output buffer after each print invocation. See How to flush output of Python print?

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