每次我尝试运行app时,"RuntimeError:generator raise StopIteration"

Question

我正在尝试运行此代码:

import web

urls = (
    '/', 'index'
)

if __name__ == "__main__":
    app = web.application(urls, globals())
    app.run()

但它每次都给我这个错误

C:\Users\aidke\Desktop>python app.py
Traceback (most recent call last):
  File "C:\Users\aidke\AppData\Local\Programs\Python\Python37-32\lib\site-packages\web\utils.py", line 526, in take
    yield next(seq)
StopIteration

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "app.py", line 14, in <module>
    app = web.application(urls, globals())
  File "C:\Users\aidke\AppData\Local\Programs\Python\Python37-32\lib\site-packages\web\application.py", line 62, in __init__
    self.init_mapping(mapping)
  File "C:\Users\aidke\AppData\Local\Programs\Python\Python37-32\lib\site-packages\web\application.py", line 130, in init_mapping
    self.mapping = list(utils.group(mapping, 2))
  File "C:\Users\aidke\AppData\Local\Programs\Python\Python37-32\lib\site-packages\web\utils.py", line 531, in group
    x = list(take(seq, size))
RuntimeError: generator raised StopIteration

我尝试了别人的代码,发生了同样的事情.此外,我尝试重新安装web.py(实验),但它仍然无法正常工作.

Answer 1

从文件路径判断,看起来你正在运行Python 3.7.如果是这样,你会被这里描述的3.7新行为所困扰:

PEP 479针对Python 3.7中的所有代码启用,这意味着在协同程序和生成器中直接或间接引发的StopIteration异常将转换为RuntimeError异常.(由Yury Selivanov供稿于bpo-32670.)

在此更改之前,StopIteration通过生成器引发或通过生成器只会结束生成器的使用寿命(异常被静默吞噬).您正在使用的模块必须按照3.7的预期重新编码.

他们有可能需要改变:

yield next(seq)

至:

try:
    yield next(seq)
except StopIteration:
    return