面临通过 Python 从 gmail 下载特定附件的问题答案

【问题标题】：Facing issues in downloading a particular attachment from gmail through Python面临通过 Python 从 gmail 下载特定附件的问题
【发布时间】：2021-04-07 13:55:59
【问题描述】：

我有以下代码，可以很好地下载 CSV 文件。但是我正在尝试下载一个没有任何扩展名的文件，但这是失败的。 part.get_filename() 没有获取任何内容，因此代码失败并出现错误 NameError: name 'fileName' is not defined。搜索工作正常并识别特定电子邮件。

import gspread
from oauth2client.service_account import ServiceAccountCredentials
import pandas as pd
import os
import imaplib
import email
#from email.header import decode_header
#import webbrowser
import os
import datetime
import time
import glob
import shutil

today = datetime.date.today()
yday = today - datetime.timedelta(days=5)

# account credentials
username = "xyz@gmail.com"
with open(r'C:\Users\xyz\Downloads\Google sheet key\gmail_app_pwd.txt','r') as pwd:
   password=pwd.read()


# create an IMAP4 class with SSL 
mailBox = imaplib.IMAP4_SSL("imap.gmail.com")
# authenticate
mailBox.login(username, password)


svdir = r'C:\Users\xyz\Downloads\Work'


boxList = mailBox.list()
# print(boxList)

mailBox.select()

searchQuery = '(SUBJECT "Mailer as on ' + str(yday) +'")'


result, data = mailBox.uid('search', None, searchQuery)
ids = data[0]
# list of uids
id_list = ids.split()

i = len(id_list)
#x=0
for x in range(i):
    latest_email_uid = id_list[x]

    # fetch the email body (RFC822) for the given ID
    result, email_data = mailBox.uid('fetch', latest_email_uid, '(RFC822)')
    
    raw_email = email_data[0][1]

    # converts byte literal to string removing b''
    raw_email_string = raw_email.decode('utf-8')
    email_message = email.message_from_string(raw_email_string)

    # downloading attachments
    for part in email_message.walk():
        if part.get_content_maintype() == 'multipart':
            continue
        if part.get('Content-Disposition') is None:
            continue
        fileName = part.get_filename()

        if bool(fileName):
            filePath = os.path.join(svdir, fileName)
            if not os.path.isfile(filePath) :
                fp = open(filePath, 'wb')
                fp.write(part.get_payload(decode=True))
                fp.close()

    subject = str(email_message).split("Subject: ", 1)[1].split("\nTo:", 1)[0]
    print('Downloaded "{file}" from email titled "{subject}" with UID {uid}.'.format(file=fileName, subject=subject, uid=latest_email_uid.decode('utf-8')))

mailBox.close()
mailBox.logout()

【问题讨论】：

如果没有文件名，你想让这段代码做什么？
有一个文件名，但没有任何扩展名。该文件仅称为“datapoints”，下载完成后我可以将其重命名为“datapoints.csv”并使用。我无法让发件人进行更改（如果缺少扩展名导致此问题）
如果没有文件名扩展名，你想让这段代码做什么？
下载文件，将其重命名为适当的扩展名，然后将其用于任何目的
您在这方面有什么问题？你试过什么？（为什么不首先将其保存到适当的文件名和扩展名，并避免需要重命名它？）

标签： python download gmail attachment

【解决方案1】：

在我删除支票后它起作用了。更新代码：

for x in range(i):
    latest_email_uid = id_list[x]

    # fetch the email body (RFC822) for the given ID
    result, email_data = mailBox.uid('fetch', latest_email_uid, '(RFC822)')
    
    raw_email = email_data[0][1]

    # converts byte literal to string removing b''
    raw_email_string = raw_email.decode('utf-8')
    email_message = email.message_from_string(raw_email_string)

    # downloading attachments
    for part in email_message.walk():
        **fileName = "file.csv"**
        if bool(fileName):
            filePath = os.path.join(svdir, fileName)
            if not os.path.isfile(filePath) :
                fp = open(filePath, 'wb')
                fp.write(part.get_payload(decode=True))
                fp.close()

【讨论】：