在 Python 2.7 中,我使用以下命令连接到外部数据源:
import pypyodbc
import pandas as pd
import datetime
import csv
import boto3
import os
# Connect to the DataSource
conn = pypyodbc.connect("DSN = FAKE DATA SOURCE; UID=FAKEID; PWD=FAKEPASSWORD")
# Specify the query we're going to run on it
script = ("SELECT * FROM table")
# Create a dataframe from the above query
df = pd.read_sql_query(script, conn)
我收到以下错误:
C:\Python27\python.exe "C:/Thing.py"
Traceback (most recent call last):
File "C:/Thing.py", line 30, in <module>
df = pd.read_sql_query(script,conn)
File "C:\Python27\lib\site-packages\pandas-0.18.1-py2.7-win32.egg\pandas\io\sql.py", line 431, in read_sql_query
parse_dates=parse_dates, chunksize=chunksize)
File "C:\Python27\lib\site-packages\pandas-0.18.1-py2.7-win32.egg\pandas\io\sql.py", line 1608, in read_query
data = self._fetchall_as_list(cursor)
File "C:\Python27\lib\site-packages\pandas-0.18.1-py2.7-win32.egg\pandas\io\sql.py", line 1617, in _fetchall_as_list
result = cur.fetchall()
File "build\bdist.win32\egg\pypyodbc.py", line 1819, in fetchall
File "build\bdist.win32\egg\pypyodbc.py", line 1871, in fetchone
ValueError: could not convert string to float: ?
在我看来,在其中一个浮动列中,有一个“?” 出于某种原因的符号。我已联系数据源的所有者,但他们无法更改基础表。
有没有办法使用熊猫替换这样的不正确数据?我试过在read_sql_query
声明后使用replace,但我得到了同样的错误。