AttributeError: exit while buffering downloaded image on python 2.7

Question

我正在尝试使用 python 脚本自动识别验证码文件。然而，经过几天的努力，我的功能似乎与预期的结果相去甚远。

此外，我得到的回溯信息不足以帮助我进一步调查。

这是我的函数：

def getmsg():
    solved = ''
    probe_request = []
    try:
        probe_request = api.messages.get(offset = 0, count = 2)
    except apierror, e:
        if e.code is 14:
            key = e.captcha_sid
            imagefile = cStringIO.StringIO(urllib.urlopen(e.captcha_img).read())
            img = Image.open(imagefile)
            imagebuf = img.load()
            with imagebuf as captcha_file:
                captcha = cptapi.solve(captcha_file)
    finally:
        while solved is None:
            solved = captcha.try_get_result()
            tm.sleep(1.500)
        print probe_request

这是回溯：

Traceback (most recent call last):
  File "myscript.py", line 158, in <module>
    getmsg()
  File "myscript.py", line 147, in getmsg
    with imagebuf as captcha_file:
AttributeError: __exit__

有人可以澄清我到底做错了什么吗？

此外，我在没有缓冲的情况下进行图像处理也没有成功：

key = e.captcha_sid
response = requests.get(e.captcha_img)
img = Image.open(StringIO.StringIO(response.content))
with img as captcha_file:
    captcha = cptapi.solve(captcha_file)

这导致：

    captcha = cptapi.solve(captcha_file)
  File "/usr/local/lib/python2.7/dist-packages/twocaptchaapi/__init__.py", line 62, in proxy
    return func(*args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/twocaptchaapi/__init__.py", line 75, in proxy
    return func(*args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/twocaptchaapi/__init__.py", line 147, in solve
    raw_data = file.read()
  File "/usr/lib/python2.7/dist-packages/PIL/Image.py", line 632, in __getattr__
    raise AttributeError(name)
AttributeError: read

Answer 1

imagebuf 不是 context manager. You can't use it in a with statement, which tests for a context manager by first storing the contextmanager.__exit__ method。也不需要关闭。

cptapi.solve 需要类文件对象；来自 solve() docstring:

Queues a captcha for solving. file may either be a path or a file object.

在这里传递 Image 对象没有意义，只需传递 StringIO 实例即可：

imagefile = cStringIO.StringIO(urllib.urlopen(e.captcha_img).read())
captcha = cptapi.solve(imagefile)

再说一次，这里不需要使用close that object，你不需要使用with.

AttributeError: exit while buffering downloaded image on python 2.7

AttributeError: exit while buffering downloaded image on python 2.7

python

image

buffering

python-imaging-library

python-2.7

AttributeError: __exit__ while buffering downloaded image on python 2.7

AttributeError: __exit__ while buffering downloaded image on python 2.7

python

image

buffering

python-imaging-library

python-2.7

AttributeError: exit while buffering downloaded image on python 2.7

AttributeError: exit while buffering downloaded image on python 2.7