如何修复Python电子邮件包中的BadHeaderError？

Question

 import sys
 import os
 import shutil
 import emails # sudo pip install emails 
 from emails.template import JinjaTemplate as T


 file = open('email.txt', 'r') # reading email string from the user`s .txt 
 # file

 # userm = str(file.read()) # allocating variable and casting the read 
 # result, if required

 userm = file.read() # read the file content, no variable casting in this 
 # case

 print (userm) # checking the content

 message = emails.html(subject=T('Data processing request{{ billno }}'),
          html=T('<p>Dear {{ name }}! Your genomics data have been processed, 
download the attached files and look at your genome annotations, please'),
          mail_from=('Genomics data processor', 'XXXXXXXXXXX'))

message.send(to=('Scientist', userm), # second argument is a email of the 
user coming from the .txt file
render={'name': 'Scientist', 'billno': '777'})
 message.attach(data=open('processedfiles.zip', 'rb'), 
filename='YourGenomeProcessedAnnotations.zip', content_disposition='inline')
m = message.as_message()
s = message.as_string()
r = message.send(to=('Scientist', userm), # second argument is a email of 
the user coming from the .txt file
     render={'name': 'Scientist'},
     smtp={'host':'smtp.yandex.com', 'port': 465, 'ssl': True, 'user': 
'XXXXXXXXXX', 'password': 'XXXXXXX'}) # Write your own credentials here
  assert r.status_code == 250

这些代码在Windows上工作，但是在linuxmint上崩溃了，产生了一个坏的错误，如何修复这个问题，请

一个月前它在Linux上运行得很好，现在不行了，不知道原因。在其他Linux上尝试过，错误又是一样的

日志如下：

Traceback (most recent call last):
  File "BACK_END_PYTHON.py", line 29, in <module>
    render={'name': 'Scientist', 'billno': '777'})
  File "/usr/local/lib/python2.7/dist-packages/emails/message.py", line 404, in send
    return smtp.sendmail(**params)
  File "/usr/local/lib/python2.7/dist-packages/emails/backend/smtp/backend.py", line 117, in sendmail
    msg=msg.as_string(),
  File "/usr/local/lib/python2.7/dist-packages/emails/message.py", line 337, in as_string
    r = to_native(self.build_message(message_cls=message_cls).as_string())
  File "/usr/local/lib/python2.7/dist-packages/emails/message.py", line 284, in build_message
    msg = self._build_root_message(message_cls)
  File "/usr/local/lib/python2.7/dist-packages/emails/message.py", line 258, in _build_root_message
    self.set_header(msg, 'To', ", ".join([self.encode_address_header(addr) for addr in mail_to]), encode=False)
  File "/usr/local/lib/python2.7/dist-packages/emails/message.py", line 227, in set_header
    raise BadHeaderError("Header values can't contain newlines (got %r for header %r)" % (value, key))
emails.exc.BadHeaderError: Header values can't contain newlines (got u'Scientist <XXXXXXXXXX\n>' for header u'To')

---

（程序退出，代码：1） 按return继续

Answer 1

异常文本解释了问题-文本末尾有一个换行符，用于创建“to”标头

emails.exc.BadHeaderError: Header values can't contain newlines (got u'Scientist <XXXXXXXXXX\n>' for header u'To')

在读取文件后，需要去掉换行符（'\n'）：

userm = file.read().strip()