python - 转换字符串参数以发送电子邮件可以帮助我(python)

Question

import smtplib
import sys
if(len(sys.argv) > 1):
 smtp = smtplib.SMTP_SSL('smtp.gmail.com', 465)
 smtp.login('gmail.com', 'password')
 de = '@gmail.com'
 para = ['@gmail.com']
 msg2=str(sys.argv[1])
 msg = """From: %s
To: %s
Subject: SMATIJ
server"""+msg2+"""""" % (de, ', '.join(para))

我遇到此错误:TypeError:在 msg2 中进行字符串格式化期间，并非所有参数都已转换

 smtp.sendmail(de, para, msg)
 smtp.close()
 print "sending message"

Answer 1

这是真正破坏的部分

msg = """From: %s
To: %s
Subject: SMATIJ
server"""+msg2+"""""" % (de, ', '.join(para))

如果我们把它分解，你告诉 python 要做的是:

"""first string %s %s """ +\    # a string of text with 2 placeholders
 msg2 +\                        # a string
 """""" % (de, ', '.join(para)) # empty string of text with no placeholders
                                # (formatted with 2 variables)

你真正想要的可能是这样的:

msg = """From: %s
To: %s
Subject: SMATIJ
server""" % (de, ', '.join(para)) + msg2