Markdown
Downloading packages:
Delta RPMs disabled because /usr/bin/applydeltarpm not installed.
File "/usr/libexec/urlgrabber-ext-down", line 28
except OSError, e:
^
SyntaxError: invalid syntax
原因：
此问题安装Deltarpm包（增量 RPM 套件）即可解决，当然您也可以先使用一下命令，查看是哪个包提供applydeltarpm解决方法：
yum provides '*/applydeltarpm'
yum install deltarpm -y
Downloading packages:
File "/usr/libexec/urlgrabber-ext-down", line 28
except OSError, e:
^
SyntaxError: invalid syntax
原因：
默认 python3
解决：
vi /usr/libexec/urlgrabber-ext-down
首行 python 改为 python3
2、yum install python-devel
正常执行问题二： yum install zbar-devel
Loading mirror speeds from cached hostfile * base: mirrors.bupt.edu.cn * extras: mirrors.bupt.edu.cn * updates: mirrors.tuna.tsinghua.edu.cn 没有可用软件包 zbar-devel。解决方法：
wget http://download-ib01.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm rpm -Uvh epel-release-latest-7.noarch.rpm yum install zbar-devel 正常执行3、安装 pyzbar
pip3 install pyzbar==0.1.8
搞定！！！
