The picture is a screenshot from the IDEA editor on my OSX system. This may be just a problem with the python I am using. So sad.
Python 2.7.10 (default, Oct  6 2017, 22:29:07)
[GCC 4.2.1 Compatible Apple LLVM 9.0.0 (clang-900.0.31)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import errno
>>> errno.EDEADLK
11
>>> errno.EAGAIN
35
>>> import os
>>> os.strerror(11)
'Resource deadlock avoided'
>>> os.strerror(35)
'Resource temporarily unavailable'
>>>

Any more, follow your shell commands, I found this:

➜  ~ grep -E 'EDEADLK|EAGAIN' /usr/include/sys/errno.h
#define	EDEADLK		11		/* Resource deadlock avoided */
					/* 11 was EAGAIN */
#define	EAGAIN		35		/* Resource temporarily unavailable */
#define	EWOULDBLOCK	EAGAIN		/* Operation would block */
 
And my OS info:
➜  ~ uname -a
Darwin lktokendeMacBook-Air.local 17.6.0 Darwin Kernel Version 17.6.0: Tue May  8 15:22:16 PDT 2018; root:xnu-4570.61.1~1/RELEASE_X86_64 x86_64

Thank you very much.