Installing package dependencies for Scrapy
Question: So among the many packages users need to install for Scrapy, I think I'm
having trouble with pyOpenSSL.

When I try to get a tutorial Scrapy project created, I get this following
output:

    
    
    Traceback (most recent call last):
      File "C:\Python27\lib\runpy.py", line 162, in _run_module_as_main
        "__main__", fname, loader, pkg_name)
      File "C:\Python27\lib\runpy.py", line 72, in _run_code
        exec code in run_globals
      File "C:\Python27\lib\site-packages\scrapy\cmdline.py", line 168, in <module>
        execute()
      File "C:\Python27\lib\site-packages\scrapy\cmdline.py", line 122, in execute
        cmds = _get_commands_dict(settings, inproject)
      File "C:\Python27\lib\site-packages\scrapy\cmdline.py", line 46, in _get_comma
    nds_dict
        cmds = _get_commands_from_module('scrapy.commands', inproject)
      File "C:\Python27\lib\site-packages\scrapy\cmdline.py", line 29, in _get_comma
    nds_from_module
        for cmd in _iter_command_classes(module):
      File "C:\Python27\lib\site-packages\scrapy\cmdline.py", line 20, in _iter_comm
    and_classes
        for module in walk_modules(module_name):
      File "C:\Python27\lib\site-packages\scrapy\utils\misc.py", line 68, in walk_mo
    dules
        submod = import_module(fullpath)
      File "C:\Python27\lib\importlib\__init__.py", line 37, in import_module
        __import__(name)
      File "C:\Python27\lib\site-packages\scrapy\commands\bench.py", line 3, in <mod
    ule>
        from scrapy.tests.mockserver import MockServer
      File "C:\Python27\lib\site-packages\scrapy\tests\mockserver.py", line 6, in <m
    odule>
        from twisted.internet import reactor, defer, ssl
      File "C:\Python27\lib\site-packages\twisted\internet\ssl.py", line 59, in <mod
    ule>
        from OpenSSL import SSL
      File "build\bdist.win32\egg\OpenSSL\__init__.py", line 8, in <module>
      File "build\bdist.win32\egg\OpenSSL\rand.py", line 11, in <module>
      File "build\bdist.win32\egg\OpenSSL\_util.py", line 3, in <module>
    ImportError: No module named cryptography.hazmat.bindings.openssl.binding
    

And when I googled that last error (no module named cryptography.hazmat), I
see a couple of mentions of pyOpenSSL. So I went ahead and tried running
`easy_install pyOpenSSL==0.14` to make sure it's the latest version, but when
I do that, I get this output:

    
    
    c:\python27\include\pymath.h(22) : warning C4273: 'round' : inconsistent dll lin
    kage
            C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\INCLUDE\math.h(51
    6) : see previous definition of 'round'
    c:\users\bk\appdata\local\temp\easy_install-tztawu\cryptography-0.4\temp\easy_in
    stall-svxsjy\cffi-0.8.2\c\misc_win32.h(225) : error C2632: 'char' followed by 'b
    ool' is illegal
    c:\users\bk\appdata\local\temp\easy_install-tztawu\cryptography-0.4\temp\easy_in
    stall-svxsjy\cffi-0.8.2\c\misc_win32.h(225) : warning C4091: 'typedef ' : ignore
    d on left of 'unsigned char' when no variable is declared
    c/_cffi_backend.c(5295) : warning C4146: unary minus operator applied to unsigne
    d type, result still unsigned
    c/_cffi_backend.c(5296) : warning C4146: unary minus operator applied to unsigne
    d type, result still unsigned
    c/_cffi_backend.c(5297) : warning C4146: unary minus operator applied to unsigne
    d type, result still unsigned
    c/_cffi_backend.c(5298) : warning C4146: unary minus operator applied to unsigne
    d type, result still unsigned
    error: Setup script exited with error: command '"C:\Program Files (x86)\Microsof
    t Visual Studio 12.0\VC\BIN\cl.exe"' failed with exit status 2
    

So I'm a bit lost as to what I need to do to get Scrapy up and running
properly


Answer: I got the same error on Mac OS.

I solved it by using openssl 0.13 instead of the latest version.

    
    
    easy_install pyOpenSSL==0.13
    

or

    
    
    pip install pyOpenSSL==0.13
    

