多实例mysql的安装和管理【验证通过】
mysql的多实例有两种方式可以实现，两种方式各有利弊。
第一种是使用多个配置文件启动不同的进程来实现多实例，这种方式的优势逻辑简单，配置简单，缺点是管理起来不太方便。
第二种是通过官方自带的mysqld_multi使用单独的配置文件来实现多实例，这种方式定制每个实例的配置不太方面，优点是管理起来很方便，集中管理。
下面就分别来实战这两种多实例的安装和管理
环境介绍：
mysql 版本：5.1.50
操作系统：SUSE 11
mysql实例数：3个
实例占用端口分别为：3306、3307、3308
创建mysql用户
/usr/sbin/groupadd mysql
/usr/sbin/useradd -g mysql mysql
编译安装mysql
tar xzvf mysql-5.1..tar.gz
cd mysql-5.1.
./configure '--prefix=/usr/local/mysql' '--with-charset=utf8' '--with-extra-charsets=complex' '--with-pthread' '--enable-thread-safe-client' '--with-ssl' '--with-client-ldflags=-all-static' '--with-mysqld-ldflags=-all-static' '--with-plugins=partition,innobase,blackhole,myisam,innodb_plugin,heap,archive' '--enable-shared' '--enable-assembler'
make
make install
初始化数据库
/usr/local/mysql/bin/mysql_install_db --basedir=/usr/local/mysql --datadir=/data/dbdata_3306 --user=mysql
/usr/local/mysql/bin/mysql_install_db --basedir=/usr/local/mysql --datadir=/data/dbdata_3307 --user=mysql
/usr/local/mysql/bin/mysql_install_db --basedir=/usr/local/mysql --datadir=/data/dbdata_3308 --user=mysql
创建配置文件
vim /data/dbdata_3306/my.cnf
3306的配置文件如下：
[client]
port =
socket = /data/dbdata_3306/mysql.sock
[mysqld]
datadir=/data/dbdata_3306/
skip-name-resolve
lower_case_table_names=
innodb_file_per_table=
port =
socket = /data/dbdata_3306/mysql.sock
back_log =
max_connections =
max_connect_errors =
table_open_cache =
max_allowed_packet = 16M
binlog_cache_size = 2M
max_heap_table_size = 64M
sort_buffer_size = 2M
join_buffer_size = 2M
thread_cache_size =
thread_concurrency =
query_cache_size = 64M
query_cache_limit = 2M
ft_min_word_len =
default-storage-engine = innodb
thread_stack = 192K
transaction_isolation = REPEATABLE-READ
tmp_table_size = 64M
log-bin=mysql-bin
binlog_format=mixed
slow_query_log
long_query_time =
server-id =
key_buffer_size = 8M
read_buffer_size = 2M
read_rnd_buffer_size = 2M
bulk_insert_buffer_size = 64M
myisam_sort_buffer_size = 128M
myisam_max_sort_file_size = 10G
myisam_repair_threads =
myisam_recover
innodb_additional_mem_pool_size = 16M
innodb_buffer_pool_size = 200M
innodb_data_file_path = ibdata1:10M:autoextend
innodb_file_io_threads =
innodb_thread_concurrency =
innodb_flush_log_at_trx_commit =
innodb_log_buffer_size = 16M
innodb_log_file_size = 512M
innodb_log_files_in_group =
innodb_max_dirty_pages_pct =
innodb_lock_wait_timeout =
[mysqldump]
quick
max_allowed_packet = 256M
[mysql]
no-auto-rehash
prompt=\\u@\\d \\R:\\m>
[myisamchk]
key_buffer_size = 512M
sort_buffer_size = 512M
read_buffer = 8M
write_buffer = 8M
[mysqlhotcopy]
interactive-timeout
[mysqld_safe]
open-files-limit =
vim /data/dbdata_3307/my.cnf
3307的配置文件如下：
[client]
port =
socket = /data/dbdata_3307/mysql.sock
[mysqld]
datadir=/data/dbdata_3307/
skip-name-resolve
lower_case_table_names=
innodb_file_per_table=
port =
socket = /data/dbdata_3307/mysql.sock
back_log =
max_connections =
max_connect_errors =
table_open_cache =
max_allowed_packet = 16M
binlog_cache_size = 2M
max_heap_table_size = 64M
sort_buffer_size = 2M
join_buffer_size = 2M
thread_cache_size =
thread_concurrency =
query_cache_size = 64M
query_cache_limit = 2M
ft_min_word_len =
default-storage-engine = innodb
thread_stack = 192K
transaction_isolation = REPEATABLE-READ
tmp_table_size = 64M
log-bin=mysql-bin
binlog_format=mixed
slow_query_log
long_query_time =
server-id =
key_buffer_size = 8M
read_buffer_size = 2M
read_rnd_buffer_size = 2M
bulk_insert_buffer_size = 64M
myisam_sort_buffer_size = 128M
myisam_max_sort_file_size = 10G
myisam_repair_threads =
myisam_recover
innodb_additional_mem_pool_size = 16M
innodb_buffer_pool_size = 200M
innodb_data_file_path = ibdata1:10M:autoextend
innodb_file_io_threads =
innodb_thread_concurrency =
innodb_flush_log_at_trx_commit =
innodb_log_buffer_size = 16M
innodb_log_file_size = 512M
innodb_log_files_in_group =
innodb_max_dirty_pages_pct =
innodb_lock_wait_timeout =
[mysqldump]
quick
max_allowed_packet = 256M
[mysql]
no-auto-rehash
prompt=\\u@\\d \\R:\\m>
[myisamchk]
key_buffer_size = 512M
sort_buffer_size = 512M
read_buffer = 8M
write_buffer = 8M
[mysqlhotcopy]
interactive-timeout
[mysqld_safe]
open-files-limit =
vim /data/dbdata_3308/my.cnf
3308的配置文件如下：
[client]
port =
socket = /data/dbdata_3308/mysql.sock
[mysqld]
datadir=/data/dbdata_3308/
skip-name-resolve
lower_case_table_names=
innodb_file_per_table=
port =
socket = /data/dbdata_3308/mysql.sock
back_log =
max_connections =
max_connect_errors =
table_open_cache =
max_allowed_packet = 16M
binlog_cache_size = 2M
max_heap_table_size = 64M
sort_buffer_size = 2M
join_buffer_size = 2M
thread_cache_size =
thread_concurrency =
query_cache_size = 64M
query_cache_limit = 2M
ft_min_word_len =
default-storage-engine = innodb
thread_stack = 192K
transaction_isolation = REPEATABLE-READ
tmp_table_size = 64M
log-bin=mysql-bin
binlog_format=mixed
slow_query_log
long_query_time =
server-id =
key_buffer_size = 8M
read_buffer_size = 2M
read_rnd_buffer_size = 2M
bulk_insert_buffer_size = 64M
myisam_sort_buffer_size = 128M
myisam_max_sort_file_size = 10G
myisam_repair_threads =
myisam_recover
innodb_additional_mem_pool_size = 16M
innodb_buffer_pool_size = 200M
innodb_data_file_path = ibdata1:10M:autoextend
innodb_file_io_threads =
innodb_thread_concurrency =
innodb_flush_log_at_trx_commit =
innodb_log_buffer_size = 16M
innodb_log_file_size = 512M
innodb_log_files_in_group =
innodb_max_dirty_pages_pct =
innodb_lock_wait_timeout =
[mysqldump]
quick
max_allowed_packet = 256M
[mysql]
no-auto-rehash
prompt=\\u@\\d \\R:\\m>
[myisamchk]
key_buffer_size = 512M
sort_buffer_size = 512M
read_buffer = 8M
write_buffer = 8M
[mysqlhotcopy]
interactive-timeout
[mysqld_safe]
open-files-limit =
创建自动启动文件
vim /data/dbdata_3306/mysqld
3306的启动文件如下：
#!/bin/bash
mysql_port=
mysql_username="admin"
mysql_password="password"
function_start_mysql()
{
printf "Starting MySQL...\n"
/bin/sh /usr/local/mysql/bin/mysqld_safe --defaults-file=/data/dbdata_${mysql_port}/my.cnf >& > /dev/null &
}
function_stop_mysql()
{
printf "Stoping MySQL...\n"
/usr/local/mysql/bin/mysqladmin -u ${mysql_username} -p${mysql_password} -S /data/dbdata_${mysql_port}/mysql.sock shutdown
}
function_restart_mysql()
{
printf "Restarting MySQL...\n"
function_stop_mysql
function_start_mysql
}
function_kill_mysql()
{
kill - $(ps -ef | grep 'bin/mysqld_safe' | grep ${mysql_port} | awk '{printf $2}')
kill - $(ps -ef | grep 'libexec/mysqld' | grep ${mysql_port} | awk '{printf $2}')
}
case $ in
start)
function_start_mysql;;
stop)
function_stop_mysql;;
kill)
function_kill_mysql;;
restart)
function_stop_mysql
function_start_mysql;;
*)
echo "Usage: /data/dbdata_${mysql_port}/mysqld {start|stop|restart|kill}";;
esac
vim /data/dbdata_3307/mysqld
3307的启动文件如下：
#!/bin/bash
mysql_port=
mysql_username="admin"
mysql_password="password"
function_start_mysql()
{
printf "Starting MySQL...\n"
/bin/sh /usr/local/mysql/bin/mysqld_safe --defaults-file=/data/dbdata_${mysql_port}/my.cnf >& > /dev/null &
}
function_stop_mysql()
{
printf "Stoping MySQL...\n"
/usr/local/mysql/bin/mysqladmin -u ${mysql_username} -p${mysql_password} -S /data/dbdata_${mysql_port}/mysql.sock shutdown
}
function_restart_mysql()
{
printf "Restarting MySQL...\n"
function_stop_mysql
function_start_mysql
}
function_kill_mysql()
{
kill - $(ps -ef | grep 'bin/mysqld_safe' | grep ${mysql_port} | awk '{printf $2}')
kill - $(ps -ef | grep 'libexec/mysqld' | grep ${mysql_port} | awk '{printf $2}')
}
case $ in
start)
function_start_mysql;;
stop)
function_stop_mysql;;
kill)
function_kill_mysql;;
restart)
function_stop_mysql
function_start_mysql;;
*)
echo "Usage: /data/dbdata_${mysql_port}/mysqld {start|stop|restart|kill}";;
esac
vim /data/dbdata_3308/mysqld
3308的启动文件如下：
#!/bin/bash
mysql_port=
mysql_username="admin"
mysql_password="password"
function_start_mysql()
{
printf "Starting MySQL...\n"
/bin/sh /usr/local/mysql/bin/mysqld_safe --defaults-file=/data/dbdata_${mysql_port}/my.cnf >& > /dev/null &
}
function_stop_mysql()
{
printf "Stoping MySQL...\n"
/usr/local/mysql/bin/mysqladmin -u ${mysql_username} -p${mysql_password} -S /data/dbdata_${mysql_port}/mysql.sock shutdown
}
function_restart_mysql()
{
printf "Restarting MySQL...\n"
function_stop_mysql
function_start_mysql
}
function_kill_mysql()
{
kill - $(ps -ef | grep 'bin/mysqld_safe' | grep ${mysql_port} | awk '{printf $2}')
kill - $(ps -ef | grep 'libexec/mysqld' | grep ${mysql_port} | awk '{printf $2}')
}
case $ in
start)
function_start_mysql;;
stop)
function_stop_mysql;;
kill)
function_kill_mysql;;
restart)
function_stop_mysql
function_start_mysql;;
*)
echo "Usage: /data/dbdata_${mysql_port}/mysqld {start|stop|restart|kill}";;
esac
启动3306、3307、3308的mysql
/data/dbdata_3306/mysqld start
/data/dbdata_3307/mysqld start
/data/dbdata_3308/mysqld start
更改原来密码（处于安全考虑，还需要删除系统中没有密码的帐号，这里省略了）：
/usr/local/mysql/bin/mysqladmin -uroot password 'password' -S /data/dbdata_3306/mysql.sock
/usr/local/mysql/bin/mysqladmin -uroot password 'password' -S /data/dbdata_3307/mysql.sock
/usr/local/mysql/bin/mysqladmin -uroot password 'password' -S /data/dbdata_3308/mysql.sock
登录测试并创建关闭mysql的帐号权限，mysqld脚本要用到！
/usr/local/mysql/bin/mysql -uroot -ppassword -S /data/dbdata_3308/mysql.sock
GRANT SHUTDOWN ON *.* TO 'admin'@'localhost' IDENTIFIED BY 'password';
flush privileges;
/usr/local/mysql/bin/mysql -uroot -ppassword -S /data/dbdata_3308/mysql.sock
GRANT SHUTDOWN ON *.* TO 'admin'@'localhost' IDENTIFIED BY 'password';
flush privileges;
/usr/local/mysql/bin/mysql -uroot -ppassword -S /data/dbdata_3308/mysql.sock
GRANT SHUTDOWN ON *.* TO 'admin'@'localhost' IDENTIFIED BY 'password';
flush privileges;
创建了admin帐号以后脚本的stop功能和restart功能就正常了！
更改环境变量
vim /etc/profile 添加下面一行内容
PATH=${PATH}:/usr/local/mysql/bin/
source /etc/profile
添加到自动启动
vim /etc/init.d/boot.local
/data/dbdata_3306/mysqld start
/data/dbdata_3307/mysqld start
/data/dbdata_3308/mysqld start
如果是rhel或者centos系统的话自启动文件/etc/rc.local
管理的话，在本地都是采用 -S /data/dbdata_3308/mysql.sock，如果在远程可以通过不同的端口连接上去坐管理操作。其他的和单实例的管理没什么区别！
再来看第二种通过官方自带的mysqld_multi来实现多实例实战：
这里的mysql安装以及数据库的初始化和前面的步骤一样，就不再赘述。
mysqld_multi的配置
vim /etc/my.cnf
[mysqld_multi]
mysqld = /usr/local/mysql/bin/mysqld_safe
mysqladmin = /usr/local/mysql/bin/mysqladmin
user = admin
password = password
[mysqld1]
socket = /data/dbdata_3306/mysql.sock
port =
pid-file = /data/dbdata_3306/.pid
datadir = /data/dbdata_3306
user = mysql
skip-name-resolve
lower_case_table_names=
innodb_file_per_table=
back_log =
max_connections =
max_connect_errors =
table_open_cache =
max_allowed_packet = 16M
binlog_cache_size = 2M
max_heap_table_size = 64M
sort_buffer_size = 2M
join_buffer_size = 2M
thread_cache_size =
thread_concurrency =
query_cache_size = 64M
query_cache_limit = 2M
ft_min_word_len =
default-storage-engine = innodb
thread_stack = 192K
transaction_isolation = REPEATABLE-READ
tmp_table_size = 64M
log-bin=mysql-bin
binlog_format=mixed
slow_query_log
long_query_time =
server-id =
key_buffer_size = 8M
read_buffer_size = 2M
read_rnd_buffer_size = 2M
bulk_insert_buffer_size = 64M
myisam_sort_buffer_size = 128M
myisam_max_sort_file_size = 10G
myisam_repair_threads =
myisam_recover
innodb_additional_mem_pool_size = 16M
innodb_buffer_pool_size = 200M
innodb_data_file_path = ibdata1:10M:autoextend
innodb_file_io_threads =
innodb_thread_concurrency =
innodb_flush_log_at_trx_commit =
innodb_log_buffer_size = 16M
innodb_log_file_size = 512M
innodb_log_files_in_group =
innodb_max_dirty_pages_pct =
innodb_lock_wait_timeout =
[mysqld2]
socket = /data/dbdata_3307/mysql.sock
port =
pid-file = /data/dbdata_3307/.pid
datadir = /data/dbdata_3307
user = mysql
skip-name-resolve
lower_case_table_names=
innodb_file_per_table=
back_log =
max_connections =
max_connect_errors =
table_open_cache =
max_allowed_packet = 16M
binlog_cache_size = 2M
max_heap_table_size = 64M
sort_buffer_size = 2M
join_buffer_size = 2M
thread_cache_size =
thread_concurrency =
query_cache_size = 64M
query_cache_limit = 2M
ft_min_word_len =
default-storage-engine = innodb
thread_stack = 192K
transaction_isolation = REPEATABLE-READ
tmp_table_size = 64M
log-bin=mysql-bin
binlog_format=mixed
slow_query_log
long_query_time =
server-id =
key_buffer_size = 8M
read_buffer_size = 2M
read_rnd_buffer_size = 2M
bulk_insert_buffer_size = 64M
myisam_sort_buffer_size = 128M
myisam_max_sort_file_size = 10G
myisam_repair_threads =
myisam_recover
innodb_additional_mem_pool_size = 16M
innodb_buffer_pool_size = 200M
innodb_data_file_path = ibdata1:10M:autoextend
innodb_file_io_threads =
innodb_thread_concurrency =
innodb_flush_log_at_trx_commit =
innodb_log_buffer_size = 16M
innodb_log_file_size = 512M
innodb_log_files_in_group =
innodb_max_dirty_pages_pct =
innodb_lock_wait_timeout =
[mysqld3]
socket = /data/dbdata_3308/mysql.sock
port =
pid-file = /data/dbdata_3308/.pid
datadir = /data/dbdata_3308
user = mysql
skip-name-resolve
lower_case_table_names=
innodb_file_per_table=
back_log =
max_connections =
max_connect_errors =
table_open_cache =
max_allowed_packet = 16M
binlog_cache_size = 2M
max_heap_table_size = 64M
sort_buffer_size = 2M
join_buffer_size = 2M
thread_cache_size =
thread_concurrency =
query_cache_size = 64M
query_cache_limit = 2M
ft_min_word_len =
default-storage-engine = innodb
thread_stack = 192K
transaction_isolation = REPEATABLE-READ
tmp_table_size = 64M
log-bin=mysql-bin
binlog_format=mixed
slow_query_log
long_query_time =
server-id =
key_buffer_size = 8M
read_buffer_size = 2M
read_rnd_buffer_size = 2M
bulk_insert_buffer_size = 64M
myisam_sort_buffer_size = 128M
myisam_max_sort_file_size = 10G
myisam_repair_threads =
myisam_recover
innodb_additional_mem_pool_size = 16M
innodb_buffer_pool_size = 200M
innodb_data_file_path = ibdata1:10M:autoextend
innodb_file_io_threads =
innodb_thread_concurrency =
innodb_flush_log_at_trx_commit =
innodb_log_buffer_size = 16M
innodb_log_file_size = 512M
innodb_log_files_in_group =
innodb_max_dirty_pages_pct =
innodb_lock_wait_timeout =
[mysqldump]
quick
max_allowed_packet = 256M
[mysql]
no-auto-rehash
prompt=\\u@\\d \\R:\\m>
[myisamchk]
key_buffer_size = 512M
sort_buffer_size = 512M
read_buffer = 8M
write_buffer = 8M
[mysqlhotcopy]
interactive-timeout
[mysqld_safe]
open-files-limit =
mysqld_multi启动
/usr/local/mysql/bin/mysqld_multi start
/usr/local/mysql/bin/mysqld_multi start
/usr/local/mysql/bin/mysqld_multi start
或者采用一条命令的形式：
/usr/local/mysql/bin/mysqld_multi start -
更改原来密码（处于安全考虑，还需要删除系统中没有密码的帐号，这里省略了）：
/usr/local/mysql/bin/mysqladmin -uroot password 'password' -S /data/dbdata_3306/mysql.sock
/usr/local/mysql/bin/mysqladmin -uroot password 'password' -S /data/dbdata_3307/mysql.sock
/usr/local/mysql/bin/mysqladmin -uroot password 'password' -S /data/dbdata_3308/mysql.sock
登录测试并创建admin密码(停止mysql的时候需要使用到)
/usr/local/mysql/bin/mysql -uroot -ppassword -S /data/dbdata_3308/mysql.sock
GRANT SHUTDOWN ON *.* TO 'admin'@'localhost' IDENTIFIED BY 'password';
flush privileges;
/usr/local/mysql/bin/mysql -uroot -ppassword -S /data/dbdata_3308/mysql.sock
GRANT SHUTDOWN ON *.* TO 'admin'@'localhost' IDENTIFIED BY 'password';
flush privileges;
/usr/local/mysql/bin/mysql -uroot -ppassword -S /data/dbdata_3308/mysql.sock
GRANT SHUTDOWN ON *.* TO 'admin'@'localhost' IDENTIFIED BY 'password';
flush privileges;
更改环境变量
vim /etc/profile
PATH=${PATH}:/usr/local/mysql/bin/
source /etc/profile
添加到自动启动
vim /etc/init.d/boot.local
/usr/local/mysql/bin/mysqld_multi start -
如果是rhel或者centos系统的话自启动文件/etc/rc.local
管理的话，在本地都是采用 -S /data/dbdata_3308/mysql.sock，如果在远程可以通过不同的端口连接上去坐管理操作。其他的和单实例的管理没什么区别！
大家在管理多实例的话可以使用mysqlmanager实例管理器，管理器来会比较方面，限于篇幅，这里就不在多做介绍！
多实例mysql的安装和管理【验证通过】的更多相关文章
- 多实例mysql的安装和管理
多实例mysql的安装和管理 http://blog.chinaunix.net/uid-20639775-id-3438560.html mysql的多实例有两种方式可以实现,两种方式各有利弊.第一 ...
- mysql 手动安装和管理
版本:5.7.10 my.ini简单配置 [client] default-character-set=utf8 [mysqld] port = 3306 basedir =D:/programs/M ...
- MySQL第01课- CentOS + 单实例MySql编译安装总结
2016年2月,从oracle转向MySql ,碰上几个坑,特此记录 总结 1.注意环境变量.配置文件,操作过程不能出错 2.相比rpm方式安装,编译安装方式可以指定安装路径,再说安装是简单活,将来安 ...
- MySQL基础篇——安装、管理
MySQL 安装 所有平台的 MySQL 下载地址为https://dev.mysql.com/downloads/mysql/ .挑选你需要的 MySQL Community Server 版本及对 ...
- Vue+node.js+express+mysql实例---对图书信息进行管理
一个简单的 CURD 实例 ---对图书信息进行管理 目录 1 开发环境 1.1 前端开发环境 1.2 后端开发环境 2 数据库设计和创建 2.1 数据库和表设计 2.2 book 表设计 2.3 s ...
- [MySQL数据库之数据库相关概念、MySQL下载安装、MySQL软件基本管理、SQL语句]
[MySQL数据库之数据库相关概念.MySQL下载安装.MySQL软件基本管理.SQL语句] 数据库相关概念 数据库管理软件的由来 数据库管理软件:本质就是个C/S架构的套接字程序. 我们在编写任何程 ...
- linux学习笔记4：linux的任务调度，进程管理，mysql的安装和使用，ssh工具的使用，linux网络编程
1.设置任务调度命令crontab 任务调度是指系统在某个时间执行的特定的命令或程序.任务调度分为:1)系统工作:有些重要的工作必须周而复始的执行,如病毒扫描.2)个别用户工作:个别用户可能希望执行某 ...
- Mysql单实例脚本自动化安装
安装包:mysql-5.6.31.tar.gz 已有配置文件:my.cnf *注意:本次Mysql的配置文件是在my.cnf的基础上更改得到的,my.cnf存放路径为/opt/rh/my.cnf 脚本 ...
- 一台Ubuntu server上安装多实例MySQL
受环境所迫,在一台Ubuntu server上安装多个实例MySQL. 手动安装MySQL 环境:Ubuntu server 11.10 64bit + mysql-5.5.17-linux2.6-x ...
随机推荐
- CSS 第1练 搜索
1.搜索 效果: <!DOCTYPE HTML> <html> <head> <meta charset="gbk" /> < ...
- pandas dataframe.apply() 实现对某一行/列进行处理获得一个新行/新列
重点:dataframe.apply(function,axis)对一行或一列做出一些操作(axis=1则为对某一列进行操作,此时,apply函数每次将dataframe的一行传给function,然 ...
- 迷你MVVM框架 avalonjs 0.98发布
在本版本中,avalon侧重于对组件开发的支持,可用控件达到12个,末来将大力投入对GRID,TREE等重型UI的开发中. 添加ms-widget绑定,废弃ms-ui绑定 为ms-include添加跨 ...
- abd启动不了
解决办法: 杀死 db.exe或者tadb.exe
- mysql查询大于X分钟数
select * from table where date_add(STR_TO_DATE(createtime,'%Y-%m-%d %T:%i:%s'), interval '00:60:00 ...
- oracle删除表空间下所有的表
SELECT 'DROP TABLE ' || TABLE_NAME || ' CASCADE CONSTRAINTS' V_NAME FROM DBA_TABLES WHERE TABLESPACE ...
- AlexNet 2012
AlexNet Alexnet是一年一度的ImageNet大型视觉识别挑战赛(ILSVRC)2012年冠军,ILSVRC使用ImageNet的一个子集,分为1000种类别,每种 ...
- python virtualenv环境安装(ubuntu)
测试系统ubantu16.04 该系统已经默认安装了python3.5, 当然了python2.7也同时存在着. 可以用如下命令安装pip(如下命令会默认安装pip到python2.7库中) $ su ...
- Java设计模式(7)——装饰者模式
转载:http://blog.csdn.net/yanbober/article/details/45395747 一.装饰者模式的定义 装饰者( Decorator )模式又叫做包装模式.通过一种对 ...
- kaggle-泰坦尼克号Titanic-2
下面我们再来看看各种舱级别情况下各性别的获救情况 fig = plt.figure() fig.set(alpha=0.5) plt.title(u"根据舱等级和性别的获救情况", ...