如何使用pythons xlrd模块从Excel工作表中读取

Question

I have the following code. What am I trying to do is screenscrape a website and then write the data to an excel worksheet. I can't read the existing data from excel file.

import xlwt
import xlrd
from xlutils.copy import copy
from datetime import datetime
import urllib.request
from bs4 import BeautifulSoup
import re
import time
import os  
links= open('links.txt', encoding='utf-8')
#excel workbook
if os.path.isfile('./TestSheet.xls'):
    rbook=xlrd.open_workbook('TestSheet.xls',formatting_info=True)
    book=copy(rbook)
else:
    book = xlwt.Workbook()

try:
    book.add_sheet("wayanad")
except:
    print("sheet exists")
    sheet=book.get_sheet(1)

for line in links:
    print("Currently Scanning\n","\n=================\n",line.rstrip())
    url=str(line.rstrip())    
    req = urllib.request.Request(url, headers={'User-Agent': 'Mozilla/5.0'})
    html = urllib.request.urlopen(req)
    soup = BeautifulSoup(html,"html.parser")
    #print(soup.prettify())
    title=soup.find('h1').get_text()    
    data=[]
    for i in soup.find_all('p'):
       data.append(i.get_text())
    quick_descr=data[1].strip()
    category=data[2].strip()
    tags=data[3].strip()
    owner=data[4].strip()
    website=data[6].strip()
    full_description=data[7]
    address=re.sub('\s+', ' ', soup.find('h3').get_text()).strip()
    city=soup.find(attrs={"itemprop": "addressRegion"}).get_text().strip()
    postcode=soup.find(attrs={"itemprop": "postalCode"}).get_text().strip()
    phone=[]
    result=soup.findAll('h4')
    for h in result:
        if h.has_attr('itemprop'):
            phone.append(re.sub("\D", "", h.get_text()))

    #writing data to excel
    row=sheet.last_used_row
    column_count=sheet.ncols()    
    book.save("Testsheet.xls")
    time.sleep(2)           

The code explained

• I have a links file there are many links line by line. So pick a line(URL) and go that URL and scrape the data.
• Open an excel workbook and switch to a sheet for writing data.
• append the data to excel sheet.->>

Screenshot of execl sheet structure

Currently the list is empty. But i want to continue from the last row. I coudn't read data from the cell. The documentation says there is sheet.ncols is avilable to count the columns. But it throws an error

>>>column_count=sheet.ncols()
>>>AttributeError: 'Worksheet' object has no attribute 'ncols'

What i wanted is a way to count rows and columns, and read the data from cell. Many turials are old. Now i am using python 3.4. I've already gone through this links and many other. But no luck

Stack overflow

Stackoverdlow

Answer 1

Is that what you are looking for ? Going through all col.?

xl_workbook = xlrd.open_workbook

num_cols = xl_sheet.ncols
for row_idx in range(0, xl_sheet.nrows):