Захват отладочного вывода из Python smtplib

Question

Как получить вывод отладки из библиотеки smtplib Python?

Вот моя тестовая программа:

import smtplib 
s = smtplib.SMTP("mx10.comcast.com") 
s.set_debuglevel(1) 
s.sendmail("no-such-sender@comcast.com",["no-such-receiver@comcast.com"],""" 
from: no-such-sender@comcast.com 
to: no-such-receiver@comcast.com 
subject: no such message 

This message won't be delivered to anybody. 
""") 

Вот результат:

send: 'ehlo dance.local\r\n' 
reply: '250-mx10.comcast.com says EHLO to 129.6.220.67:57015\r\n' 
reply: '250-SIZE 40000000\r\n' 
reply: '250-PIPELINING\r\n' 
reply: '250-ENHANCEDSTATUSCODES\r\n' 
reply: '250-8BITMIME\r\n' 
reply: '250 XXXXXXXA\r\n' 
reply: retcode (250); Msg: mx10.comcast.com says EHLO to 129.6.220.67:57015 
SIZE 40000000 
PIPELINING 
ENHANCEDSTATUSCODES 
8BITMIME 
XXXXXXXA 
send: 'mail FROM:<no-such-sender@comcast.com> size=137\r\n' 
reply: '250 2.0.0 MAIL FROM accepted\r\n' 
reply: retcode (250); Msg: 2.0.0 MAIL FROM accepted 
send: 'rcpt TO:<no-such-receiver@comcast.com>\r\n' 
reply: '550 5.1.1 Recipient address rejected: {Gateway}\r\n' 
reply: retcode (550); Msg: 5.1.1 Recipient address rejected: {Gateway} 
send: 'rset\r\n' 
reply: '250 2.0.0 RSET OK\r\n' 
reply: retcode (250); Msg: 2.0.0 RSET OK 
Traceback (most recent call last): 
    File "/Users/simsong/x.py", line 11, in <module> 
    """) 
    File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/smtplib.py", line 742, in sendmail 
    raise SMTPRecipientsRefused(senderrs) 
smtplib.SMTPRecipientsRefused: {'no-such-receiver@comcast.com': (550, '5.1.1 Recipient address rejected: {Gateway}')} 

Я хочу вывод в переменную, output. В частности, я хочу, чтобы все линии начинались с и reply:.

Answer 1

Это может быть сделано путем перенаправления STDERR в файл:

import tempfile, smtplib, os, sys 

# Find an available file descriptor                        
t = tempfile.TemporaryFile() 
available_fd = t.fileno() 
t.close() 

# now make a copy of stderr                          
os.dup2(2,available_fd) 

# Now create a new tempfile and make Python's stderr go to that file                
t = tempfile.TemporaryFile() 
os.dup2(t.fileno(),2) 

# Now run the task that logs to stderr                       
s = smtplib.SMTP("mx10.comcast.com") 
s.set_debuglevel(1) 
s.sendmail("no-such-sender@comcast.com",["no-such-receiver@comcast.com"],"""              
from: no-such-sender@comcast.com                         
to: no-such-receiver@comcast.com                         
subject: no such message                           

This message won't be delivered to anybody.                      
""") 

# Grab the stderr from the temp file                        
sys.stderr.flush() 
t.flush() 
t.seek(0) 
stderr_output = t.read() 
t.close() 

# Put back stderr                             
os.dup2(available_fd,2) 
os.close(available_fd) 


# Finally, demonstrate that we have the output:                     
print("STDERR:") 
count = 0 
for line in stderr_output.decode('utf-8').split("\n"): 
    count += 1 
    print("{:3} {}".format(count,line)) 

Answer 2

Исследование ошибка:

a = None 
try: 
    s.sendmail("no-such-sender@comcast.com" ["no-suchreceiver@comcast.com"],""" 
    from: no-such-sender@comcast.com 
    to: no-such-receiver@comcast.com 
    subject: no such message 

    This message won't be delivered to anybody. 
    """) 
except smtplib.SMTPRecipientsRefused as e: 
    a = e 

Теперь вы можете посмотреть, как извлечь его:

a.args 

({'no-such-receiver@comcast.com': (550, b'5.1.1 Recipient address rejected: {Gateway}')},)

a.args[0]['no-such-receiver@comcast.com'][1] 

b'5.1.1 Recipient address rejected: {Gateway}'

А вот ваше сообщение!

Так, чтобы извлечь его:

message = None 
try: 
    s.sendmail("...") 

except smtplib.SMTPException as e: 
    message = e.args[0]['no-such-receiver@comcast.com'][1]