Python3.7.2使用web.py报错解决办法

首先请确保使用

pip install web.py==0.40-dev1

安装web.py。
运行官网实例：

import web
        
urls = (
    '/(.*)', 'hello'
)
app = web.application(urls, globals())

class hello:        
    def GET(self, name):
        if not name: 
            name = 'World'
        return 'Hello, ' + name + '!'

if __name__ == "__main__":
    app.run()

却出现报错，如下：

Traceback (most recent call last):
  File "D:\Program Files\Python\Python37\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 "D:\Python\hello.py", line 6, in 
    app = web.application(urls, globals(),True)
  File "D:\Program Files\Python\Python37\lib\site-packages\web\application.py", line 62, in __init__
    self.init_mapping(mapping)
  File "D:\Program Files\Python\Python37\lib\site-packages\web\application.py", line 130, in init_mapping
    self.mapping = list(utils.group(mapping, 2))
  File "D:\Program Files\Python\Python37\lib\site-packages\web\utils.py", line 531, in group
    x = list(take(seq, size))
RuntimeError: generator raised StopIteration

修改Lib\site-packages\web 下的utils.py文件。
将第526行的

yield next(seq)

修改为

try:
    yield next(seq)
except StopIteration:
    return

重新运行实例代码将正常运行，输出如下：

http://0.0.0.0:8080/

在浏览器中访问

http://127.0.0.1:8080/

显示

Hello, World!