SQL запросов в панд питона

Question

Я пишу запрос SQL в питона панд:

import pandas as pd 
from pandas import DataFrame, read_csv 
import numpy as np 
from pandasql import sqldf 
pysqldf=lambda q:sqldf(q,globals()) 
rolup = pysqldf(u"select MasterUserId,DeviceUsed,hcluster, count(MasterUserId) as Tot_Rec, sum(Visits),sum(PV),sum(TimeSpent) from clstrd_data group by MasterUserId,DeviceUsed,hcluster;") 

Ошибка:

sqlite3.ProgrammingError: You must not use 8-bit bytestrings unless you use a text_factory that can interpret 8-bit bytestrings (like text_factory = str). It is highly recommended that you instead just switch your application to Unicode strings. 

Как переключиться на строки Unicode? Я использую python2.7.

Answer 1

Согласно python unicode howto:

In Python source code, Unicode literals are written as strings prefixed with the ‘u’ or ‘U’ character: u'abcdefghijk' 

Другими словами, ваш сценарий должен прочитать:

import pandas as pd 
from pandas import DataFrame, read_csv 
import numpy as np 
from pandasql import sqldf 
pysqldf=lambda q:sqldf(q,globals()) 
rolup = pysqldf(u"select MasterUserId,DeviceUsed,hcluster, count(MasterUserId) as Tot_Rec, sum(Visits),sum(PV),sum(TimeSpent) from clstrd_data group by MasterUserId,DeviceUsed,hcluster;") 

Надежда, что помогает.