pip3安装PyYAML失败。（python3.7，macOS High Sierra）

今天我使用brew upgrade命令升级了python3.7。\n然后我尝试使用pip3安装PyYAML包。\n但我遇到了以下错误，不知道怎么解决..\n

\n% pip3 install PyYAML\n    检查libyaml是否链接\n    clang build/temp.macosx-10.13-x86_64-3.7/check_libyaml.o -L/usr/local/lib -L/usr/local/opt/openssl/lib -L/usr/local/opt/sqlite/lib -lyaml -o build/temp.macosx-10.13-x86_64-3.7/check_libyaml\n    构建\'_yaml\'扩展\n    创建build/temp.macosx-10.13-x86_64-3.7/ext\n    clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -I/usr/local/include -I/usr/local/opt/openssl/include -I/usr/local/opt/sqlite/include -I/usr/local/Cellar/python/3.7.0/Frameworks/Python.framework/Versions/3.7/include/python3.7m -c ext/_yaml.c -o build/temp.macosx-10.13-x86_64-3.7/ext/_yaml.o\n    在文件ext/_yaml.c的271行包含：\n    ext/_yaml.h:10:9: 警告：宏“PyString_CheckExact”被重新定义[-Wmacro-redefined]\n    #define PyString_CheckExact PyBytes_CheckExact\n            ^\n    ext/_yaml.c:139:11: 注意：前一次定义在这里\n      #define PyString_CheckExact          PyUnicode_CheckExact\n              ^\n    ext/_yaml.c:1410:17: 警告：从\'const char *\'赋值给\'char *\'会丢失限定符[-Wincompatible-pointer-types-discards-qualifiers]\n      __pyx_v_value = yaml_get_version_string();\n                    ^ ~~~~~~~~~~~~~~~~~~~~~~~~~\n    ext/_yaml.c:2577:52: 警告：传递\'int (void *, char *, size_t, size_t *)\'(类型为\'int (void *, char *, unsigned long, unsigned long *)\')给参数类型为\'yaml_read_handler_t *\'(类型为\'int (*)(void *, unsigned char *, unsigned long, unsigned long *)\')的指针类型不兼容[-Wincompatible-pointer-types]\n        yaml_parser_set_input((&__pyx_v_self->parser), __pyx_f_5_yaml_input_handler, ((void *)__pyx_v_self));\n                                                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~\n    /usr/local/include/yaml.h:1370:30: 注意：在此传递参数给\'handler\'\n.......\n

\n最终出现以下错误\n

    /usr/local/Cellar/python/3.7.0/Frameworks/Python.framework/Versions/3.7/include/python3.7m/pystate.h:238:15: 注意：在此声明\'curexc_traceback\'\n        PyObject *curexc_traceback;\n                  ^\n    生成了51个警告和15个错误。\n    错误：命令\'clang\'以退出状态1失败。\n    ----------------------------------------\n命令\"/usr/local/opt/python/bin/python3.7 -u -c \"import setuptools, tokenize;__file__=\'/private/tmp/pip-install-exbgmayz/PyYAML/setup.py\';f=getattr(tokenize, \'open\', open)(__file__);code=f.read().replace(\'\\r\\n\', \'\\n\');f.close();exec(compile(code, __file__, \'exec\'))\" install --record /private/tmp/pip-record-n11vy5s0/install-record.txt --single-version-externally-managed --compile\"失败，错误代码为1，在/private/tmp/pip-install-exbgmayz/PyYAML/中\n

\n我尝试解决这个问题，但还是没有头绪。\n

\n
• https://github.com/yaml/pyyaml/issues/126

\n

• How do I install the yaml package for Python?

\n

\n我应该如何解决这个问题..?