Python smtplib 主题在函数内部不工作

Question

我在为 Python 使用 smtplib 时遇到了一个奇怪的现象。我正在写一条简单的消息，使用 f-strings 和两个 \n 来分隔主题 header。这在函数外部时工作正常，但在函数内部时表现不同。

从函数外部发送的电子邮件发送主题：“函数外部” 从函数内部发送的电子邮件主题为：“无主题”

这是为什么？

我当然想解决这个问题，但最终我更感兴趣的是导致这个问题的原因！

下面的代码...如果您想测试，只需输入您的 Gmail 地址和密码即可。

import smtplib

login = "youremail@gmail.com"
password = "yourpassword"

name = "name"

server = smtplib.SMTP('smtp.gmail.com', 587)
server.starttls()
server.login(login, password)


def sendMail():
    message = f"""\
    Subject: Sent from inside a function
    To: {login}
    From: {login}

    Hello {name},
    This is sent from inside a function"""

    server.sendmail(login, receiver, message)

sendMail()


message = f"""\
Subject: Outside a function
To: {login}
From: {login}

Hello {name},
This is sent from outside a function"""

server.sendmail(login, receiver, message)

Answer 1

import smtplib

login = "test@gmail.com"
password = "test"
receiver=login

name = "name"

server = smtplib.SMTP('smtp.gmail.com', 587)
server.starttls()
server.login(login, password)


def sendMail():
    message = f"""\
Subject: Sent from inside a function
To: {login}
From: {login}

Hello {name},
This is sent from inside a function"""

    server.sendmail(login, receiver, message)


sendMail()

python 缩进仅适用于命令而不适用于多行字符串。当你给 space 它有不同的语法不一样。以上将产生相同的结果

如果您不想要不必要的缩进，请从第一行本身开始

import smtplib

login = "test@gmail.com"
password = "test"
receiver=login

name = "name"

server = smtplib.SMTP('smtp.gmail.com', 587)
server.starttls()
server.login(login, password)


def sendMail():
    message = f"""Subject: Sent from inside a function
    To: {login}
    From: {login}

    Hello {name},
    This is sent from inside a function"""

    server.sendmail(login, receiver, message)


sendMail()

Python smtplib 主题在函数内部不工作

Python smtplib subject not working inside function

python

smtplib