1.pip3安装mysqlclient报错python setup.py egg_info Check the logs for full command output.
在CentOS上部署Django项目时，经常需要安装MySQL数据库引擎，如mysqlclient，在执行pip3 install mysqlclient命令时，可能会报错如下：
ERROR: Command errored out with exit status 1: command: /usr/bin/python3 -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-zmnd8v74/mysqlclient/setup.py'"'"'; __file__='"'"'/tmp/pip-install-zmnd8v74/mysqlclient/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base /tmp/pip-pip-egg-info-jpy0d_w0 cwd: /tmp/pip-install-zmnd8v74/mysqlclient/ Complete output (12 lines): /bin/sh: mysql_config: command not found /bin/sh: mariadb_config: command not found /bin/sh: mysql_config: command not found Traceback (most recent call last): File "<string>", line 1, in <module> File "/tmp/pip-install-zmnd8v74/mysqlclient/setup.py", line 15, in <module> metadata, options = get_config() File "/tmp/pip-install-zmnd8v74/mysqlclient/setup_posix.py", line 65, in get_config libs = mysql_config("libs") File "/tmp/pip-install-zmnd8v74/mysqlclient/setup_posix.py", line 31, in mysql_config raise OSError("{} not found".format(_mysql_config_path)) OSError: mysql_config not found ---------------------------------------- ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.
这是因为缺少mysql-devel包，需要现进行安装，同时为了解决包版本冲突和依赖冲突，需要先下载并安装mysql的yum源，命令如下：
# 下载对应版本mysql的yum源的rpm包 wget http://repo.mysql.com/mysql57-community-release-el7-8.noarch.rpm # 安装rpm包 rpm -ivh mysql57-community-release-el7-8.noarch.rpm
然后再执行yum install mysql-devel命令安装mysql-devel包，打印如下：
Loaded plugins: fastestmirror mysql-connectors-community | 2.6 kB 00:00:00 mysql-tools-community | 2.6 kB 00:00:00 mysql57-community | 2.6 kB 00:00:00 Loading mirror speeds from cached hostfile Resolving Dependencies --> Running transaction check ---> Package mysql-community-devel.x86_64 0:5.7.32-1.el7 will be installed --> Finished Dependency Resolution
就将mysql-devel包安装成功了。
最后再执行pip3 install mysqlclient命令就可以成功安装mysqlclient引擎。
2.vim编辑文件时每一行末尾都有^M
用Linux打开Windows或Mac本地编辑过的文本文件时，末尾都会带^M，如下：
这是CTRL+M，是换行符\r，最简单的方式是在命令模式下进行替换即可，如下：
命令为:%s#\r##或%s/\r//。
