python如何清除每个旧的打印输出并替换新内容（多行）

Question

正常情况下，如果终端只能打印一行内容，

flush=True

可以完美完成，但如果长度太长，可能需要两行，

flush

无法清除第一行，而是清除第二行.

控制台输出

我是否可以清除这两行并打印新内容？

代码：

content = [i for i in range(11)]
print(content, flush=True, end="\r")
content.append(11)
print(content, flush=True, end="\r")

输出：

# before second print
(first line)                [0, 1, 2, 3, 4,
(second line)               5, 6, 7, 8, 9, 
(thrid line)                10]

# after second print
(first line)                [0, 1, 2, 3, 4,
(second line)               5, 6, 7, 8, 9, 
(second print replaced)     [0, 1, 2, 3, 4,
(second print replaced)     5, 6, 7, 8, 9, 
(second print replaced)     10, 11]

# what i want
# clear all the three lines in the first print and replace them
(second print replaced)     [0, 1, 2, 3, 4,
(second print replaced)     5, 6, 7, 8, 9, 
(second print replaced)     10, 11]

Answer 1

有趣的谜题。

这是我解决这个问题的方法，您可以进一步开发它以达到您想要的效果。

我从这里

获取了6行长文本

我让它放弃了长行文本，并使用

.

而不是空格作为空白，这样就清楚发生了什么。我将剪辑设置为 4，以便您可以看到每次都被

.

覆盖的结尾。

#!/usr/bin/python3

import os, time

# make a lot of lines
longlines = """
Python is an easy to learn, powerful programming language. It has efficient high-level data structures and a simple but effective approach to object-oriented programming. Python’s elegant syntax and dynamic typing, together with its interpreted nature, make it an ideal language for scripting and rapid application development in many areas on most platforms.
The Python interpreter and the extensive standard library are freely available in source or binary form for all major platforms from the Python web site, https://www.python.org/, and may be freely distributed. The same site also contains distributions of and pointers to many free third party Python modules, programs and tools, and additional documentation.
The Python interpreter is easily extended with new functions and data types implemented in C or C++ (or other languages callable from C). Python is also suitable as an extension language for customizable applications.
This tutorial introduces the reader informally to the basic concepts and features of the Python language and system. It helps to have a Python interpreter handy for hands-on experience, but all examples are self-contained, so the tutorial can be read off-line as well.
For a description of standard objects and modules, see The Python Standard Library. The Python Language Reference gives a more formal definition of the language. To write extensions in C or C++, read Extending and Embedding the Python Interpreter and Python/C API Reference Manual. There are also several books covering Python in depth.
This tutorial does not attempt to be comprehensive and cover every single feature, or even every commonly used feature. Instead, it introduces many of Python’s most noteworthy features, and will give you a good idea of the language’s flavor and style. After reading it, you will be able to read and write Python modules and programs, and you will be ready to learn more about the various Python library modules described in The Python Standard Library.
""".splitlines()

maxsize = os.get_terminal_size().columns
for content in longlines:
    while content:
        clip = 4
        chunk, content = content[:maxsize - clip], content[maxsize:]
        print(f"\r{chunk}", end=f"{'.' * int(maxsize - len(chunk))}", flush=True )
        time.sleep(1)

或者有curses（我讨厌使用它），但它们会干净地做你想做的事。还有另一个较新的诅咒库，但遗憾的是我无法为您找到它。