从电子邮件中提取数据仅显示打印后仅发生"subject name"的最后一天的数据

Question

import imaplib
import email
import getpass
import pandas as pd
#The usual process of email reading:
username = 'xxxxxxxxxxxxx' 
password = 'xxxxxxxxxx' 
mail = imaplib.IMAP4_SSL("imap.gmail.com")
mail.login(username, password)
mail.select("inbox")
#determining the needed subject:
result, numbers = mail.search(None, '(Subject "*warning")')
uids = numbers[0].split()
uids = [id.decode("utf-8") for id in uids ]
result, messages = mail.fetch(','.join(uids) ,'(RFC822)')
#creating the lists to fetch the following:
body_list =[]
to_list = []
date_list = []
from_list = [] 
subject_list = []
for _, message in messages[::2]:
email_message = email.message_from_bytes(message)
email_subject = email.header.decode_header(email_message['Subject'])[0]
for part in email_message.walk():
if part.get_content_type() == "text/plain" :
body = part.get_payload(decode=True)
body = body.decode("utf-8")
body_list.append(body)
else:
continue
if isinstance(email_subject[0],bytes):
decoded = email_subject.decode(errors="ignore")
subject_list.append(decoded)

else:
subject_list.append(email_subject[0])
date_list.append(email_message.get('date'))
fromlist = email_message.get('from')
from_list.append(fromlist)
tolist =  email_message.get('to')             
to_list.append(tolist)  
date_list = pd.to_datetime(date_list)
date_list = [item.isoformat(' ')[:-6]for item in date_list]
a = {'Date':date_list,'Sender':from_list,'Receiver':to_list,'Subject':subject_list, 
'Body':body_list}
data = pd.DataFrame.from_dict(a, orient='index')
data.to_csv('emails.csv',index=False)
data = pd.read_csv(r"C:emails.csv").transpose()
print(data)

提取的数据框是最后一天的主题名称只出现，其他日子没有记录，这使得它有用，我怀疑有什么问题，当涉及到列表，请帮助我解决这个问题"谢谢提前"

Answer 1

在循环开头打印部分解决了这个问题。

感谢Keramat的评论