Python - AttributeError:'NoneType'对象没有属性'cursor'

Question

我有以下代码:

import pyodbc

conn = pyodbc.connect('DSN=QueryBuilder')
cursor = conn.cursor()
stringA = "SELECT GrantInformation.Call FROM GrantInformation"
cursor.execute(stringA)
rows = cursor.fetchall()

它运作良好多年,但突然间它已经停止了今天的工作与以下追溯:

Traceback (most recent call last):
  File "C:/Users/nicholas/Desktop/test.py", line 6, in <module>
    cursor = conn.cursor()
AttributeError: 'NoneType' object has no attribute 'cursor'

该代码仍可在Jupyter Notebook中使用,但不再适用于Pycharm/IDLE

如果我在Pycharm中运行:

print(pyodbc.dataSources())
print(pyodbc.drivers())

我明白了:

none
none

如果我在Jupyter Notebook中这样做,我得到:

{'Visio Database Samples': 'Microsoft Access Driver (*.mdb, *.accdb)', 'dBASE Files': 'Microsoft Access dBASE Driver (*.dbf, *.ndx, *.mdx)', 'Excel Files': 'Microsoft Excel Driver (*.xls, *.xlsx, *.xlsm, *.xlsb)', 'MS Access Database': 'Microsoft Access Driver (*.mdb, *.accdb)', 'QueryBuilder': 'SQL Server', 'QueryBuilder_Beta': 'SQL Server', 'MIDAS': 'SQL Server', 'Querybuilder_YearEnd': 'SQL Server', 'ResearchFish': 'SQL Server', 'ESRCContacts': 'SQL Server', 'ESRCContactsDEV': 'SQL Server', 'Sample Amazon Redshift DSN': 'Amazon Redshift (x64)'}

['SQL Server', 'SQL Server Native Client 10.0', 'Amazon Redshift (x64)', 'SQL Server Native Client 11.0', 'PostgreSQL ANSI(x64)', 'PostgreSQL Unicode(x64)', 'ODBC Driver 11 for SQL Server', 'ODBC Driver 13 for SQL Server']

我正在失去这个情节,因为我完全依赖这段代码完成我的所有工作,但我正在做的就是修复问题,即重新安装Python,pyodbc等

Answer 1

令人惊讶的是没有人注意到这一点，但似乎 Python 3.6 和 pyodbc 存在问题......我已经回到 3.5 并且它工作正常。