如何在 Python 中更新單行進度？

Overwriting Previous Output to Display Progress Updates

In many scenarios, it is desirable to update progress on a single line periodically. In this particular case, the FTP downloader displays information about the ongoing download. However, each update creates a new line, which can be visually distracting.

One way to address this is to utilize the end keyword argument in the print statement. By default, print adds a newline character at the end of each output. However, setting end to a different string, such as a carriage return ("\r"), allows you to replace the previous line instead of creating a new one.

Here is the modified code that overwrites the previous output with the updated progress:

print(os.path.getsize(file_name)/1024+'KB / '+size+' KB downloaded!', end='\r')

By ending the line with a carriage return, the cursor returns to the beginning of the current line, enabling you to update the information in place. This technique eliminates the need for additional line management code and ensures that the progress is displayed clearly and continuously on a single line.

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