把資料儲存到CSV

CSV（Comma-Separated Values, 逗號分隔值）是儲存表哥資料的常用檔案格式
從零開始建立一個CSV檔案:

import csv

csvFile = open("../test.csv","w+")
try:
    writer =  csv.writer(csvFile)
    writer.writerow(('number','number plus 2','number times 2'))
    for i in range(10):
        writer.writerow((i,i+2,i*2))
finally:
    csvFile.close
 
()

Python新建檔案的機制考慮得非常周到，如果檔案不存在，Python會自動建立檔案(不會自動建立資料夾)。如果檔案已經存在，Python會用新的資料覆蓋之前的檔案

獲取HTML表格並寫入CSV檔案

import csv
from urllib.request import urlopen
from bs4 import BeautifulSoup

html = urlopen("http://xinsichen.com")
bsObj = BeautifulSoup(html,"lxml")
table = bsObj.findAll("table",{"class":"table table-striped table-bordered"
 
})[0]
rows = table.findAll("tr")

csvFile = open("../editors.csv","wt",newline='',encoding='utf-8')
writer = csv.writer(csvFile)
try:
    for row in rows:
        csvRow = []
        for cell in row.findAll(['td','th']):
            csvRow.append(cell.get_text())
        writer.writerow(csvRow)
finally
 
:
    csvFile.close()

讀取CSV

import csv
from io import StringIO
data = open("../editors.csv").read()

dataFile = StringIO(data)
csvReader = csv.reader(dataFile)
for row in csvReader:
    print(row)