在发送到电子邮件的字符串中使用零与一个换行符时，无换行符与双换行符

Question

我正在向电子邮件发送一个字符串，并且我想要每行一个句子，如下所示：

"Loaded LLARY_AR with 0 features
Loaded LLARY_LN with 44 features
Loaded LLARY_PT with 23 features"

但是，当我向字符串连接中添加一个换行符时，我会得到两个换行符而不是一个，如下所示：

"Loaded LLARY_AR with 0 features

Loaded LLARY_LN with 44 features

Loaded LLARY_PT with 23 features"

如果我不包含换行符我得到这个：

"Loaded LLARY_AR with 0 features Loaded LLARY_LN with 44 features Loaded LLARY_PT with 23 features"

这是代码：

msgemail = ""
for fcl in trnlist:
    try:
        tofc = param["tsde"]+"\\"+param["trema"]+fcl
        fromfc = param["msde"]+"\\"+param["mchema"]+fcl
        arcpy.DeleteFeatures_management(tofc)
        arcpy.Append_management(fromfc, tofc)
        msgemail +="\nLoaded "+fcl+" with "+str(arcpy.GetCount_management(fromfc))+" features"
        del fcl, tofc, fromfc
    except:
        msgemail +="\nUnsuccessful!! "+fcl

emailto = ["email@to","email@to"]
server = smtplib.SMTP('server.here')
header = "Results:\n"
subject = "Data"
mailmessage = header+msgemail+"\n\nCheck log for details"
message = 'Subject: %s\n\n%s' %(subject, mailmessage)
for e in emailto:
    try:
        server.sendmail("email@from",e, message)
    except:
        arcpy.AddMessage(e+" was not sent an email.")
server.quit()

我不明白为什么换行符以这种方式运行..并且是新手..显然这里缺少一些东西。

我发现这可以生成一封格式良好的电子邮件（但不包含 ..GetCount..process 中的必要信息）：

msgemail +="\nLoaded"+fcl

虽然这些不会生成格式良好的电子邮件：

msgemail +="\nLoaded "+fcl+" with "+str(arcpy.GetCount_management(fromfc))+" features"
msgemail +="\nLoaded "+fromcnt
msgemail +="\nLoaded "+fromcnt+" testing for string at end"

Answer 1

代码似乎没有问题，每一行“已加载...”之间应该只有一个换行符。

您用来查看电子邮件的电子邮件客户端可能会将换行符解释为新段落并自动插入该空格。尝试将 \n 替换为
并查看是否会产生您期望的单间距。

Answer 2

我单独使用 smtplib 遇到了同样的问题。我发现更好的方法是这样的：

from email.MIMEBase import MIMEBase
from email.MIMEText import MIMEText
from email.Utils import COMMASPACE, formatdate
from email import Encoders
import os
import smtplib

def send_mail(send_from, send_to, subject, text, files=[], server='mail.server.com'):
    assert type(send_to)==list
    assert type(files)==list
    msg = MIMEMultipart()
    msg['From'] = send_from
    msg['To'] = COMMASPACE.join(send_to)
    msg['Date'] = formatdate(localtime=True)
    msg['Subject'] = subject
    msg.attach( MIMEText(text) )
    for f in files:
        part = MIMEBase('application', "octet-stream")
        part.set_payload( open(f,"rb").read() )
        Encoders.encode_base64(part)
        part.add_header('Content-Disposition', 'attachment; filename="%s"' % os.path.basename(f))
        msg.attach(part)
    smtp = smtplib.SMTP(server)
    mydict = smtp.sendmail(send_from, send_to, msg.as_string())
    smtp.close()
    return mydict

注意字典的返回！如果某些电子邮件发送失败，smtp.sendmail 将返回失败元组列表。如果所有电子邮件发送失败，则抛出异常，如果全部成功，则字典为空。

如果你检查一下，你就会避免悲伤。

Answer 3

'\n' 可能应该出现在行尾。

这听起来很愚蠢，可能行不通，但可能值得一试。

msgemail = "\n"
for fcl in trnlist:
    try:
        tofc = param["tsde"]+"\\"+param["trema"]+fcl
        fromfc = param["msde"]+"\\"+param["mchema"]+fcl
        arcpy.DeleteFeatures_management(tofc)
        arcpy.Append_management(fromfc, tofc)
        msgemail +="Loaded "+fcl+" with "+str(arcpy.GetCount_management(fromfc))+" features\n"
        del fcl, tofc, fromfc
    except:
        msgemail +="\nUnsuccessful!! "+fcl

emailto = ["email@to","email@to"]
server = smtplib.SMTP('server.here')
header = "Results:\n"
subject = "Data"
mailmessage = header+msgemail+"\n\nCheck log for details"
message = 'Subject: %s\n\n%s' %(subject, mailmessage)
for e in emailto:
    try:
        server.sendmail("email@from",e, message)
    except:
        arcpy.AddMessage(e+" was not sent an email.")
server.quit()