Python 无法在我的mac上安装scrapy

我曾尝试在mac（10.12.3）上安装scrapy，但失败了。事实上，我可以在pycharm中导入scrapy，并且没有错误，但是，当我尝试在我的终端中使用时，发生了错误

loohazeMacBook-Pro:~ loohaze$ scrapy
Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/2.7/bin/scrapy", line 11, in <module>
    load_entry_point('Scrapy==1.3.2', 'console_scripts', 'scrapy')()
  File "/Users/loohaze/Library/Python/2.7/lib/python/site-packages/scrapy/cmdline.py", line 121, in execute
    cmds = _get_commands_dict(settings, inproject)
  File "/Users/loohaze/Library/Python/2.7/lib/python/site-packages/scrapy/cmdline.py", line 45, in _get_commands_dict
    cmds = _get_commands_from_module('scrapy.commands', inproject)
  File "/Users/loohaze/Library/Python/2.7/lib/python/site-packages/scrapy/cmdline.py", line 28, in _get_commands_from_module
    for cmd in _iter_command_classes(module):
  File "/Users/loohaze/Library/Python/2.7/lib/python/site-packages/scrapy/cmdline.py", line 19, in _iter_command_classes
    for module in walk_modules(module_name):
  File "/Users/loohaze/Library/Python/2.7/lib/python/site-packages/scrapy/utils/misc.py", line 71, in walk_modules
    submod = import_module(fullpath)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/importlib/__init__.py", line 37, in import_module
    __import__(name)
  File "/Users/loohaze/Library/Python/2.7/lib/python/site-packages/scrapy/commands/version.py", line 6, in <module>
    import OpenSSL
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/OpenSSL/__init__.py", line 8, in <module>
    from OpenSSL import rand, crypto, SSL
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/OpenSSL/rand.py", line 12, in <module>
    from OpenSSL._util import (
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/OpenSSL/_util.py", line 6, in <module>
    from cryptography.hazmat.bindings.openssl.binding import Binding
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/cryptography/hazmat/bindings/openssl/binding.py", line 14, in <module>
    from cryptography.hazmat.bindings._openssl import ffi, lib

ImportError: dynamic module does not define init function (init_openssl)

loohazeMacBook-Pro:~loohaze$scrapy
回溯（最近一次呼叫最后一次）：
文件“/Library/Frameworks/Python.framework/Versions/2.7/bin/scrapy”，第11行，在
加载入口点（'Scrapy==1.3.2'，'console\u scripts'，'Scrapy'）（）
文件“/Users/loohaze/Library/Python/2.7/lib/Python/site packages/scrapy/cmdline.py”，执行中的第121行
cmds=\u获取\u命令\u命令（设置，项目中）
文件“/Users/loohaze/Library/Python/2.7/lib/Python/site-packages/scrapy/cmdline.py”，第45行，在命令中
cmds=\u从\u模块获取\u命令\u（'scrapy.commands'，inproject）
文件“/Users/loohaze/Library/Python/2.7/lib/Python/site packages/scrapy/cmdline.py”，第28行，在\u获取\u命令\u模块中
对于命令类（模块）中的cmd：
文件“/Users/loohaze/Library/Python/2.7/lib/Python/site packages/scrapy/cmdline.py”，第19行，在命令类中
对于walk_模块中的模块（模块名称）：
文件“/Users/loohaze/Library/Python/2.7/lib/Python/site packages/scrapy/utils/misc.py”，第71行，在walk_模块中
子模块=导入模块（完整路径）
文件“/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/importlib/_init__.py”，第37行，在导入模块中
__导入（名称）
文件“/Users/loohaze/Library/Python/2.7/lib/Python/site-packages/scrapy/commands/version.py”，第6行，在
导入OpenSSL
文件“/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site packages/OpenSSL/_init__.py”，第8行，在
从OpenSSL导入rand、加密、SSL
文件“/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site packages/OpenSSL/rand.py”，第12行，在
从OpenSSL.\u util导入(
文件“/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site packages/OpenSSL/_util.py”，第6行，在
从cryptography.hazmat.bindings.openssl.binding导入绑定
文件“/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site packages/cryptography/hazmat/bindings/openssl/binding.py”，第14行，在
来自cryptography.hazmat.bindings.\u openssl导入ffi，lib
ImportError:动态模块未定义初始化函数（init_openssl）

我是python新手，请帮帮我！谢谢

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