TypeError：'datetime.datetime'对象不可下标

Question

#!/usr/bin/env python
# coding: utf-8
import MySQLdb
import os,sys
import time
import datetime
from pyExcelerator import *

def main():
    '''get datas from mysql to excel'''
    w=Workbook()
    ws=w.add_sheet('user')

    mysql_conn=MySQLdb.connect(................,charset="utf8")
    cursor=mysql_conn.cursor()

    cursor.execute("select * from students")
    results=cursor.fetchall() 
    results_count=len(results)
    cursor.close()
    mysql_conn.close()  
    a=results_count-1
    print a
    #print results

    row=0     
    for r in results:        
        r3=[(x[0:2],x[2],x[3:]) for x in r]
        w3=datetime.strptime("%Y-%m-%d %H:%M:%S") 
        [ws.write(x[0:2],i) for i in r3]

        [ws.write(w3,i) for i in r3]
        [ws.write(x[3:],i or '') for i in r3]:       
        row+=1  
    w.save('data.xls')

if __name__ == "__main__":
    main()

I want get data from mysql to excel ,but r3=[(x[0:2],x[2],x[3:]) for x in r] gives me TypeError:'datetime.datetime' object is not subscriptable .

I do not know how to about it, and I just study only 3 week, please help me?

Answer 1

x is a datetime.datetime object which cannot be use with the [] notation as in x[0:2] .

It means that one of your columns holds a date object which must be parsed differently.

Answer 2

Firstly, you don't want to be using pyExcelerator - it's old and hasn't been updated in 3 odd years (and has been superseded).

What you should be using is the utilities at http://www.python-excel.org/ and this provides functions for working with datetimes. Excel stores these as floats since a certain epoch. For info https://secure.simplistix.co.uk/svn/xlrd/trunk/xlrd/doc/xlrd.html - under the section "Dates in Excel spreadsheets". Also see https://secure.simplistix.co.uk/svn/xlrd/trunk/xlrd/doc/xlrd.html#xldate.xldate_as_tuple-function for how to convert an excel representation of a date to a standard python datetime.

If you easy_install/pip xlutils, you'll get both the xlrd (reading) and xlwt (writing) libraries. Up to version 2003 files are supported, but 2007+ (.xlsx file) support is close to coming out of beta.

edit

Forgot to mention that https://secure.simplistix.co.uk/svn/xlwt/trunk/xlwt/doc/xlwt.html describes how the xlwt library can take a datetime.dateime and convert that to an Excel cell.

Answer 3

One of the fields in your table seems to contain datetime objects, MySQLdb also returns them as datetime . You probably want to convert datetime to str first. That line seems to take some part of the datetime by using slices. You could achieve the same with datetime.strftime .