如何使用Python打印显示进度条

我想通过在同一行上打印来显示循环的进度。下面的代码段工作正常

for x in range(10):
    print("Step " + str(x), '\r', end='', flush=True)

但当我在主代码中使用它时，它似乎不起作用

epochs = 200
for epoch in range(epochs):
    # start of epoch
    start_time = time.time()
    print("Epoch: {}/{}".format(epoch+1, epochs))
    for step, train_batch in enumerate(train_gen):
        curr_loss = train_step(train_batch)
        percent_completed = step // (len(train_gen)//20)
        time_elapsed = time.time() - start_time
        print(f"{step}/{len(train_gen)}: [{'=' * percent_completed + '>' + '.'*(20-percent_completed)}] - ETA: {time_elapsed}s - Loss: {curr_loss}", '\r', end='', flush=True)
       

上述代码的输出如下所示

为什么不在嵌套的for循环中显示print语句？

尝试以下操作：

for epoch in range(epochs):
    # start of epoch
    start_time = time.time()
    print("Epoch: {}/{}".format(epoch + 1, epochs))
    for step, train_batch in enumerate(train_gen, 1):
        curr_loss = train_step(train_batch)
        percent_completed = int(step / (len(train_gen) / 20))
        time_elapsed = time.time() - start_time
        print(
            f"{step}/{len(train_gen)}: [{'=' * percent_completed + '>' + '.' * (20 - percent_completed)}] - ETA: {time_elapsed}s - Loss: {curr_loss}",
            '\r', end='', flush=True)

你有错误：

ZeroDivisionError：整数除法或模零除法

在这一行

percent_completed = step // (len(train_gen)//20)

---

看起来，屏幕截图来自print（“Epoch:{}/{}.format（Epoch+1，epochs））语句，并且“end=''”不在那里。您是否检查了“train\u gen”是否为None？“train\u gen”是否为NoneBTW:而不是

'\r'，end=''

您可以直接使用

end='\r'

首先检查

train\u get

是否为空。对于的空列表-将永远不会执行循环，也永远不会打印任何内容。