安装anaconda及修改conda config 的channels/default_channels

先说一下安装anaconda的方法，很简单，就是去官网下载然后在本地安装

bash Anaconda3-4.4.0-Linux-x86_64.sh

这个过程中要耐心，会有提问，需要输入yes来回应，并且需要按很多的回车，总之，看见让输入yes的就输入yes，不要用回车代替，其中有个关键的地方，就是是否允许anaconda将环境变量写到bashrc中:

# added by Anaconda3 4.4.0 installer
export PATH="/home/zz/anaconda3/bin:$PATH"

一定要同意，否则启动系统后它找不到anaconda的路径就没办法用了啊。

解下来就是修改conda的安装源问题。
使用如下命令可以查看conda的配置

zz@T630:~$ conda config --show
add_anaconda_token: True
add_pip_as_python_dependency: True
allow_non_channel_urls: True
allow_softlinks: True
always_copy: False
always_softlink: False
always_yes: False
anaconda_upload: None
auto_update_conda: True
changeps1: True
channel_alias: https://conda.anaconda.org
channel_priority: True
channels:
  - defaults
client_ssl_cert: None
client_ssl_cert_key: None
clobber: False
create_default_packages: []
custom_channels:
  pkgs/free: https://repo.continuum.io/
  pkgs/r: https://repo.continuum.io/
  pkgs/pro: https://repo.continuum.io/
custom_multichannels:
  defaults: ["https://repo.continuum.io/pkgs/free", "https://repo.continuum.io/pkgs/r", "https://repo.continuum.io/pkgs/pro"]
  local: []
default_channels:
  - https://repo.continuum.io/pkgs/free
  - https://repo.continuum.io/pkgs/r
  - https://repo.continuum.io/pkgs/pro
disallow: []
envs_dirs:
  - /home/zz/anaconda3/envs
  - /home/zz/.conda/envs
force: False
json: False
local_repodata_ttl: 1
migrated_channel_aliases: []
offline: False
path_conflict: clobber
  nned_packages: []
▽kgs_dirs:
  - /home/zz/anaconda3/pkgs
  - /home/zz/.conda/pkgs
proxy_servers: {}
quiet: False
remote_connect_timeout_secs: 9.15
remote_max_retries: 3
remote_read_timeout_secs: 60.0
rollback_enabled: True
shortcuts: True
show_channel_urls: None
ssl_verify: True
track_features: []
use_pip: True
verbosity: 0

上面是默认的配置，这个有什么问题呢，就是在安装有些包儿的时候它会提示超时，无法连接。我在网上查看说要修改一下源地址，也就是对应的channels和default_channels中的地址。但是呢，不知道它的配置文件在哪里，上面那一坨信息是直接用conda config –show这个命令显示出来的，找不到它的配置文件，网上说有个默认的配置文件在～/.condarc，但是找了半天没有。怎么办呢？我仔细看了一下
conda config的帮助，发现可以用命令行的方式修改配置信息，如conda config –append channels https://xxxxxx ,然后试了一下，用conda config –show查看可以添加进去，此时再看就有了~/.condarc这个文件了。突然明白了，原来这个文件是这样使用的，即conda先检查是否存在~/.condarc，有的话就加载里面的配置，没有的话就用默认的配置，但是不知道它的默认配置是保存在哪里的，不管了。
于是赶紧修改了~/.condarc如下：

channels:
  - https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
  - https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/free
  - defaults
default_channels:
  - https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/free
  - https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
  - https://repo.continuum.io/pkgs/free
  - https://repo.continuum.io/pkgs/r
  - https://repo.continuum.io/pkgs/pro

之后再查看一下：

zz@T630:~$ conda config --show
add_anaconda_token: True
add_pip_as_python_dependency: True
allow_non_channel_urls: True
allow_softlinks: True
always_copy: False
always_softlink: False
always_yes: False
anaconda_upload: None
auto_update_conda: True
changeps1: True
channel_alias: https://conda.anaconda.org
channel_priority: True
channels:
  - https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
  - https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/free
  - defaults
client_ssl_cert: None
client_ssl_cert_key: None
clobber: False
create_default_packages: []
custom_channels:
  anaconda/pkgs/free: https://mirrors.tuna.tsinghua.edu.cn/
  anaconda/cloud/conda-forge: https://mirrors.tuna.tsinghua.edu.cn/
  pkgs/free: https://repo.continuum.io/
  pkgs/r: https://repo.continuum.io/
  pkgs/pro: https://repo.continuum.io/
custom_multichannels:
  defaults: ["https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/free", "https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge", "https://repo.continuum.io/pkgs/free", "https://repo.continuum.io/pkgs/r", "https://repo.continuum.io/pkgs/pro"]
  local: []
default_channels:
  - https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/free
  - https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
  - https://repo.continuum.io/pkgs/free
  - https://repo.continuum.io/pkgs/r
  - https://repo.continuum.io/pkgs/pro
disallow: []
envs_dirs:
  - /home/zz/anaconda3/envs
  - /home/zz/.conda/envs
force: False
json: False
local_repodata_ttl: 1
migrated_channel_aliases: []
offline: False
path_conflict: clobber
pinned_packages: []
pkgs_dirs:
  - /home/zz/anaconda3/pkgs
  - /home/zz/.conda/pkgs
proxy_servers: {}
quiet: False
remote_connect_timeout_secs: 9.15
remote_max_retries: 3
remote_read_timeout_secs: 60.0
rollback_enabled: True
shortcuts: True
show_channel_urls: None
ssl_verify: True
track_features: []
use_pip: True
verbosity: 0