正則表達式提取錯誤

Question

我需要從我的網站表單中提取客戶電子郵件。 為了自動化，我寫道

# filename variables
import re
import os
import urllib2
newfilename = 'result.txt'

id = 1
while (id < 25):
    html = urllib2.urlopen("https://mywebsite.com/printform.php?userid={id}".format(id=id)).read()
    bulkemail = re.findall(r'(\b[\w.]+@+[\w.]+.+[\w.]\b)',html)
    id = id+1
emails = ""
for x in bulkemail:
    emails += str(x)+"\n"

# function to write file
def writefile():
        f = open(newfilename, 'w')
        f.write(emails)
        f.close()
        print ("File written.")
writefile()

這只是打印出我文件輸出中的最后一封電子郵件。 我知道這很愚蠢，但是誰能指出我想念的地方

Answer 1

將emails聲明放在while循環和for循環之前：

id = 1
emails = ""
while (id < 25):
    html = urllib2.urlopen("https://mywebsite.com/printform.php?userid={id}".format(id=id)).read()
    bulkemail = re.findall(r'(\b[\w.]+@+[\w.]+.+[\w.]\b)',html)
    id = id+1

    for x in bulkemail:
        emails += str(x)+"\n"

或者， 將電子郵件收集在一個列表中 ，然后輸入：

id = 1
emails = []
while (id < 25):
    html = urllib2.urlopen("https://mywebsite.com/printform.php?userid={id}".format(id=id)).read()
    emails += re.findall(r'(\b[\w.]+@+[\w.]+.+[\w.]\b)',html)
    id += 1

with open(newfilename, 'w') as f:
    for email in emails:
        f.write(email)
print("File written.")