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Python安装setuptools遇到的MARKER_EXPR错误
# python setup.py installTraceback (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