执行yum的各种命令时报以下错误，如yum list：
Fatal Python error: pycurl: libcurl link-time version is older than compile-time version
Aborted
解决：
1、安装setuptools
wget --no-check-certificate https://pypi.python.org/packages/source/s/setuptools/setuptools-19.6.tar.gz#md5=c607dd118eae682c44ed146367a17e26
tar -zxvf setuptools-19.6.tar.gz
cd setuptools-19.6
python setup.py build
python setup.py install
报错： RuntimeError: Compression requires the (missing) zlib module
解决：yum install zlib-devel
2、安装pip
wget --no-check-certificate https://pypi.python.org/packages/source/p/pip/pip-8.0.2.tar.gz#md5=3a73c4188f8dbad6a1e6f6d44d117eeb
tar -zxvf pip-8.0.2.tar.gz
cd pip-8.0.2
python setup.py build
python setup.py install
报错：pip is configured with locations that require TLS/SSL, however the ssl module in Python is not available.
解决：
yum install openssl
yum install openssl-devel
升级pip（可选）：
pip install --upgrade pip
3、下载python-devel包并安装
下载地址：http://rpmfind.net/linux/rpm2html/search.php?query=python-devel
由于系统是centos7的，所以下载以下包：
wget http://rpmfind.net/linux/centos/7.6.1810/os/x86_64/Packages/python-devel-2.7.5-76.el7.x86_64.rpm
rpm -ivh python-devel-2.7.5-76.el7.x86_64.rpm
4、卸载pycurl：
pip uninstall pycurl
export PYCURL_SSL_LIBRARY=openssl
5、再次安装pycurl：
pip install pycurl
再次运行 yum正常了。
注：如果yum list命令还是会报错：
FatalPythonerror:pycurl: libcurl link-time version is older than compile-time version
Aborted
问题可能是环境造成的。在 /etc/profile末尾加上：
export LD_LIBRARY_PATH=/usr/lib64:/usr/lib:/usr/local/VMProg/lib:/usr/local/VMProg/lib/vmware-vix-disklib/lib64:/lib64:${LD_LIBARY_PATH}
保存退出。
source /etc/profile
执行yum list正常了。
搞定。