Python在输出中包含If/else的内容，而不仅仅是prin

Question

我对python不是很有经验，但是我会为一些小工作编写python代码。目前，我有一个作业，打开一个日志文件，并提取任何被认为是错误的记录。然后将此错误列表添加为电子邮件通知的一部分。我想做的是要么包括列表，要么通知列表为空。我已经能够在控制台中这样做，但不知道如何将其作为参数添加到电子邮件中。你知道吗

if errorlist:
    print "\n".join(errorlist)
else:
    print "No Errors Found"

# Send Email 
SMTP_SERVER = {SMTP SERVER}
SMTP_PORT = {SMTP PORT}

sender = {Sender}
password = {Password}
recipient = {Recipient}
subject = "This is the subject line"
errorlist = "<br>" "\n".join(errorlist)

body = "" + errorlist + ""

headers = ["From: " + sender,
       "Subject: " + subject,
       "To: " + ", " .join(recipient),
       "MIME-Version: 1.0",
       "Content-Type: text/html"]
headers = "\r\n".join(headers)

session = smtplib.SMTP(SMTP_SERVER, SMTP_PORT)

session.ehlo()
session.starttls()
session.ehlo
session.login(sender, password)

session.sendmail(sender, recipient, headers + "\r\n\r\n" + body)
session.quit()

Answer 1

if errorlist:
    error_string =  "\n".join(errorlist) # assign it to variable
    print (error_string) # still print it
else:
    error_string = "" # assign blank to error_string
    print ("No Errors Found") # still print "no errors found"
    .
    .
    .
    body = ""+error_string+"" # 'body = error_string' is the same though
    .
    .
    .
    session.sendmail(sender, recipient, headers + "\r\n\r\n" + body) # this line you could replace "body" with "error_string" because they are pretty much goign to be equivilant because of the previous comment

您希望将错误字符串赋给一个变量，然后在以后构造主体时使用该变量。还有更大的简化空间

Answer 2

电子邮件通过以下行发送：

session.sendmail(sender, recipient, headers + "\r\n\r\n" + body)

body变量包含电子邮件的正文。为了在邮件正文中添加内容，应该将其添加到body变量所包含的字符串中。调整已添加的代码（成功打印所需结果），可以替换此行：

body = "" + errorlist + ""

有了这个：

if errorlist:
    body = "\n".join(errorlist)
else:
    body = "No Errors Found"