如果程序在Python3中失败，则跳到脚本末尾

我有一个脚本，用于在实验过程中控制一些仪器，如下所示：

camera = Camera()
stage = Stage()
results = []
# loads of other initialization

for n in steps:
    stage.move(n)
    img = camera.capture()
    # loads of other function/method calls
    results.append(img)

results = np.array(results)
np.savetxt('data.txt',results)

camera.close()
stage.close()

如果回路内部发生异常，例如摄像机或舞台出现硬件问题，则我希望保存结果并关闭仪器。如果在循环之前发生异常，那么我只想关闭仪器。如何做到这一点？我可以使用许多try/except语句，但是还有其他更好的方法吗？

您可以使用try-finally语句

camera = Camera()
stage = Stage()
try:
  # do stuff
finally:
  camera.close()
  stage.close()

您可以使用try finally语句

camera = Camera()
stage = Stage()
try:
  # do stuff
finally:
  camera.close()
  stage.close()

---

你有几个选择。您可以根据需要首先注册处理程序，一个用于关闭仪器的处理程序，然后在循环之前注册一个用于保存结果的处理程序。不过，嗯

使用两个try/except：

try:
    camera = Camera()
    stage = Stage()
    results = []
    # loads of other initialization

    try:
        for n in steps:
            stage.move(n)
            img = camera.capture()
            # loads of other function/method calls
            results.append(img)
    finally:
         results = np.array(results)
         np.savetxt('data.txt',results)
finally:
    camera.close()
    stage.close()

也许：

try:
    do_save = False
    camera = Camera()
    stage = Stage()
    results = []
    # loads of other initialization

    do_save = True
    for n in steps:
        stage.move(n)
        img = camera.capture()
        # loads of other function/method calls
        results.append(img)
finally:
    if do_save:
        results = np.array(results)
        np.savetxt('data.txt',results)
    camera.close()
    stage.close()

---

你有几个选择。您可以根据需要首先注册处理程序，一个用于关闭仪器的处理程序，然后在循环之前注册一个用于保存结果的处理程序。不过，嗯

使用两个try/except：

try:
    camera = Camera()
    stage = Stage()
    results = []
    # loads of other initialization

    try:
        for n in steps:
            stage.move(n)
            img = camera.capture()
            # loads of other function/method calls
            results.append(img)
    finally:
         results = np.array(results)
         np.savetxt('data.txt',results)
finally:
    camera.close()
    stage.close()

也许：

try:
    do_save = False
    camera = Camera()
    stage = Stage()
    results = []
    # loads of other initialization

    do_save = True
    for n in steps:
        stage.move(n)
        img = camera.capture()
        # loads of other function/method calls
        results.append(img)
finally:
    if do_save:
        results = np.array(results)
        np.savetxt('data.txt',results)
    camera.close()
    stage.close()

可能的重复可能的重复