Centos 安装 Anaconda

 # 首先从 Anaconda 官网下载 anaconda Linux 64Bit 版本命令行安装包
 $ wget https://repo.continuum.io/archive/Anaconda3-5.2.0-Linux-x86_64.sh

 # 修改权限让脚本可以运行
 $ chmod +x Anaconda3-5.2.-Linux-x86_64.sh

 # 运行该安装脚本
 $ ./Anaconda3-5.2.-Linux-x86_64.sh



 # 剩下就是一路Yes或者Enter好了...

 Welcome to Anaconda3 5.2. (by Continuum Analytics, Inc.)

 In order to continue the installation process, please review the license

 agreement.

 Please, press ENTER to continue
 >>>

 # 重新加载一下 bash 就可以使用 `conda` 命令了
 $ source ~/.bashrc

 #然后尝试一下运行 `conda -V` 命令行看是否已经安装成功，如果返回对应的版本信息，则说明安装成功。

 $ conda -V
 conda 4.2.13

 一、更新 conda 命令：conda update -n base conda
 二、安装 Scrapy 命令：conda install scrapy

2、遇到问题：tar (child): bzip2: Cannot exec: No such file or directory

tar (child): bzip2: Cannot exec: No such file or directory
tar (child): Error is not recoverable: exiting now
tar: Child returned status 2
tar: Error is not recoverable: exiting now

—————————————

解决方法很简单，只要安装bzip2就行了，yum安装的命令如下：
yum -y install bzip2

参考网址：https://blog.csdn.net/mysteryflower/article/details/93064195

如果：centos7安装scrapy error: command 'gcc' failed with exit status 1   执行以下命令：

 yum install gcc libffi-devel python-devel openssl-devel

如果重装  Anaconda3 需要执行以下命令：

 出现问题：ERROR: File or directory already exists: /root/anaconda3

 解决方案：删除即可 rm -rf   /root/anaconda3

参考网址：

1、https://rqalpha.readthedocs.io/zh_CN/latest/intro/detail_install.html

2、https://blog.csdn.net/ithongchou/article/details/83857346

3、https://blog.csdn.net/mysteryflower/article/details/93064195