Python安装setuptools遇到的MARKER_EXPR错误

# python setup.py install Traceback (most recent call last):   File "setup.py", line 11, in     import setuptools   File "/home/zhangsan/setuptools-34.4.1/setuptools/__init__.py", line 12, in     import setuptools.version   File "/home/zhangsan/setuptools-34.4.1/setuptools/version.py", line 1, in     import pkg_resources   File "/home/zhangsan/setuptools-34.4.1/pkg_resources/__init__.py", line 72, in     import packaging.requirements   File "/usr/local/lib/python2.7/site-packages/packaging/requirements.py", line 59, in     MARKER_EXPR = originalTextFor(MARKER_EXPR())("marker") TypeError: __call__() takes exactly 2 arguments (1 given) 对于这个错误，只需要提示找到requirements.py的59行，将 MARKER_EXPR = originalTextFor(MARKER_EXPR())("marker") 改成： MARKER_EXPR = originalTextFor(MARKER_EXPR)("marker") 即可。 如果在安装psycopg2遇到错误： Error: pg_config executable not found. 则表示需要安装包postgresql-devel： yum install postgresql-devel