如何在Python的控制台中创建进度栏

答案：使用Python可创建控制台进度条，1. 通过内置函数用ASCII字符实现简单文本进度条，利用\r更新同一行；2. 推荐tqdm库自动显示百分比、耗时等；3. 可自定义手动进度条添加时间、ETA等信息。

To create a progress bar in the console using Python, you don't need external libraries for basic implementations. You can build a simple and effective progress bar with just a few lines of code using built-in functions. Below are practical approaches to achieve this.

1. Simple Text-Based Progress Bar

A basic progress bar can be created using ASCII characters like █ (filled block) and spaces. The idea is to update the bar dynamically as a task progresses.

Here's how to do it:

import time
<p>def print_progress_bar(iteration, total, prefix='', suffix='', length=30):
percent = f"{100 <em> (iteration / float(total)):.1f}"
filled_length = int(length </em> iteration // total)
bar = '█' <em> filled_length   '-' </em> (length - filled_length)
print(f'\r{prefix} |{bar}| {percent}% {suffix}', end='\r')
if iteration == total:
print()</p><h1>Example usage</h1><p>total_steps = 50
for i in range(total_steps   1):
print_progress_bar(i, total_steps, prefix='Progress:', suffix='Complete', length=40)
time.sleep(0.1)  # Simulate work</p>

This function prints a progress bar that updates on the same line using \r. When the loop finishes, it prints a newline to lock the output.

2. Using tqdm (Recommended for Real Projects)

If you're okay with using a third-party library, tqdm is the most popular and efficient way to create progress bars in Python.

Install it via pip:

pip install tqdm

Then use it like this:

from tqdm import tqdm
import time
<p>for i in tqdm(range(100), desc="Processing"):
time.sleep(0.05)</p>

tqdm automatically handles percentage, elapsed time, estimated remaining time, and speed — all with minimal code.

3. Customizing Output Format

You can enhance your manual progress bar by adding dynamic elements like time elapsed or estimated time left.

Example with elapsed time:

import time
<p>start_time = time.time()
total = 100</p><p>for i in range(total   1):
time_elapsed = time.time() - start_time
percent = f"{100 <em> i / total:.1f}"
bar = '█' </em> (i // 2)   '░' <em> (50 - i // 2)
eta = time_elapsed </em> (total / max(i, 1)) - time_elapsed if i > 0 else 0
print(f'\r[{bar}] {percent}% | Time: {time_elapsed:.1f}s | ETA: {eta:.1f}s', end='')
time.sleep(0.05)
print()</p>

Creating a progress bar manually gives you full control, while tqdm saves time and adds advanced features out of the box. For scripts and tools, either approach works well depending on your needs.

Basically, just update the same line using \r and format your visual indicators clearly.

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