TypeError: unsupported operand type(s) for *: 'int' and 'NoneType'

Question

如何修复此错误：### attempt 4 from sqlalchemy import create_engine user = '*****' password = '*****' host = 'TD'

# connect
td_engine = create_engine('teradata://' + user + ':' + pasw + '@' + host + ':22/')

from sqlalchemy import create_engine

engine = create_engine('sqlite:///:memory:', echo=True) user = '****' pasw = '****' host = 'TD'

connect td_engine = create_engine('teradata://' + user + ':' + pasw + '@' + host + ':22/') Traceback (most recent call last):

File "", line 8, in td_engine = create_engine('teradata://' + user + ':' + pasw + '@' + host + ':22/')

File "C:\Users****\AppData\Local\Continuum\Anaconda3\lib\site-packages\sqlalchemy\engine__init__.py", line 387, in create_engine return strategy.create(*args, **kwargs)

File "C:\Users****\AppData\Local\Continuum\Anaconda3\lib\site-packages\sqlalchemy\engine\strategies.py", line 56, in create entrypoint = u._get_entrypoint()

File "C:\Users****\AppData\Local\Continuum\Anaconda3\lib\site-packages\sqlalchemy\engine\url.py", line 139, in _get_entrypoint cls = registry.load(name)

File "C:\Users****\AppData\Local\Continuum\Anaconda3\lib\site-packages\sqlalchemy\util\langhelpers.py", line 218, in load (self.group, name))

NoSuchModuleError: Can't load plugin: sqlalchemy.dialects:teradata

Answer 1

在您的系列数据中添加频率。 y = y.asfreq(freq='7d')

参考：https://pandas.pydata.org/pandas-docs/stable/generated/pandas.Series.asfreq.html#pandas.Series.asfreq