如何在控制台上的同一位置写入输出？

Question

我是python新手，正在编写一些脚本来自动从FTP服务器下载文件等。我想显示下载的进度，但我希望它保持在相同的位置，例如：

输出：

Downloading File FooFile.txt [47%]

我尽量避免这样的事情：

     Downloading File FooFile.txt [47%]
     Downloading File FooFile.txt [48%]
     Downloading File FooFile.txt [49%]

我该怎么做呢？

---

重复：How can I print over the current line in a command line application?

Answer 1

使用终端处理库，如curses module：

The curses module provides an interface to the curses library, the de-facto standard for portable advanced terminal handling.

Answer 2

Python2

我喜欢以下几点：

print 'Downloading File FooFile.txt [%d%%]\r'%i,

演示：

import time

for i in range(100):
    time.sleep(0.1)
    print 'Downloading File FooFile.txt [%d%%]\r'%i,

Python3

print('Downloading File FooFile.txt [%d%%]\r'%i, end="")

演示：

import time

for i in range(100):
    time.sleep(0.1)
    print('Downloading File FooFile.txt [%d%%]\r'%i, end="")

Answer 3

您还可以使用回车：

sys.stdout.write("Download progress: %d%%   \r" % (progress) )
sys.stdout.flush()