Anaconda镜像安装提示warning，存在包冲突

[doupongzeng]

发生了什么（What happened）

1. 修改.condarc 为镜像使用帮助提供

channels:
  - defaults
show_channel_urls: true
default_channels:
  - https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
  - https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/r
  - https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/msys2
custom_channels:
  conda-forge: https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud
  msys2: https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud
  bioconda: https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud
  menpo: https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud
  pytorch: https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud
  simpleitk: https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud

运行
conda install -c conda-forge scrapy
输出有warning，scrapy能够正常安装。

Collecting package metadata (current_repodata.json): done
Solving environment: \
Warning: 8 possible package resolutions (only showing differing packages):
  - https://repo.anaconda.com/pkgs/main/noarch::certifi-2020.6.20-pyhd3eb1b0_3, https://repo.anaconda.com/pkgs/main/win-64::ca-certificates-2020.10.14-0, https://repo.anaconda.com/pkgs/main/win-64::openssl-1.1.1h-he774522_0
  - defaults/noarch::certifi-2020.6.20-pyhd3eb1b0_3, https://repo.anaconda.com/pkgs/main/win-64::ca-certificates-2020.10.14-0, https://repo.anaconda.com/pkgs/main/win-64::openssl-1.1.1h-he774522_0
  - defaults/win-64::openssl-1.1.1h-he774522_0, https://repo.anaconda.com/pkgs/main/noarch::certifi-2020.6.20-pyhd3eb1b0_3, https://repo.anaconda.com/pkgs/main/win-64::ca-certificates-2020.10.14-0
  - defaults/noarch::certifi-2020.6.20-pyhd3eb1b0_3, defaults/win-64::openssl-1.1.1h-he774522_0, https://repo.anaconda.com/pkgs/main/win-64::ca-certificates-2020.10.14-0
  - defaults/win-64::ca-certificates-2020.10.14-0, defaults/win-64::openssl-1.1.1h-he774522_0, https://repo.anaconda.com/pkgs/main/noarch::certifi-2020.6.20-pyhd3eb1b0_3
  - defaults/noarch::certifi-2020.6.20-pyhd3eb1b0_3, defaults/win-64::ca-certificates-2020.10.14-0, defaults/win-64::openssl-1.1.1h-he774522_0
  - defaults/win-64::ca-certificates-2020.10.14-0, https://repo.anaconda.com/pkgs/main/noarch::certifi-2020.6.20-pyhd3eb1b0_3, https://repo.anaconda.com/pkgs/main/win-64::openssl-1.1.1h-he774522_0
  - defaults/noarch::certifi-2020.6.20-pyhd3eb1b0_3, defaults/win-64::ca-certificates-2020.10.14-0, https://repo.anaconda.com/pkgs/main/win-64::openssl-1.1.1h-he774522done

2. 修改.condarc 为 #985提到的解决办法
   依然不起作用，报一样的warning
3. 尝试执行 #719提到的测试
   进行创建是没有warning的，一切正常

期望的现象（What you expected to happen）

消除warning

如何重现（How to reproduce it）

conda install -c conda-forge scrapy

其他事项（Anything else we need to know）

• 该问题是否被之前的 issue 提出过：
• anaconda镜像源不起作用 #985
• Anaconda 镜像使用帮助提供的.condarc修改方式可能导致package解决方案冲突 #719

您的环境（Environment）

• 操作系统（OS Version）：windows 10

[skyzh]

在干净的 anaconda 环境里可以复现。应该是 conda 而非镜像源的问题。建议创建一个新环境，并参考这个帖子修改设置。

https://stackoverflow.com/questions/50996083/resolving-package-resolutions-in-conda

conda update --strict-channel-priority --all

The environment is inconsistent, please check the package plan carefully
The following packages are causing the inconsistency:

  - https://repo.anaconda.com/pkgs/main/linux-64::asn1crypto==0.24.0=py37_0
  - https://repo.anaconda.com/pkgs/main/linux-64::certifi==2019.3.9=py37_0
  - https://repo.anaconda.com/pkgs/main/linux-64::cffi==1.11.5=py37he75722e_1
  - https://repo.anaconda.com/pkgs/main/linux-64::chardet==3.0.4=py37_1
  - https://repo.anaconda.com/pkgs/main/linux-64::conda==4.6.11=py37_0
  - https://repo.anaconda.com/pkgs/main/linux-64::cryptography==2.4.2=py37h1ba5d50_0
  - https://repo.anaconda.com/pkgs/main/linux-64::idna==2.8=py37_0
  - https://repo.anaconda.com/pkgs/main/linux-64::libffi==3.2.1=hd88cf55_4
  - https://repo.anaconda.com/pkgs/main/linux-64::pip==18.1=py37_0
  - https://repo.anaconda.com/pkgs/main/linux-64::pycosat==0.6.3=py37h14c3975_0
  - https://repo.anaconda.com/pkgs/main/linux-64::pycparser==2.19=py37_0
  - https://repo.anaconda.com/pkgs/main/linux-64::pyopenssl==18.0.0=py37_0
  - https://repo.anaconda.com/pkgs/main/linux-64::pysocks==1.6.8=py37_0
  - https://repo.anaconda.com/pkgs/main/linux-64::python==3.7.3=h0371630_0
  - https://repo.anaconda.com/pkgs/main/linux-64::requests==2.21.0=py37_0
  - https://repo.anaconda.com/pkgs/main/linux-64::ruamel_yaml==0.15.46=py37h14c3975_0
  - https://repo.anaconda.com/pkgs/main/linux-64::setuptools==40.6.3=py37_0
  - https://repo.anaconda.com/pkgs/main/linux-64::six==1.12.0=py37_0
  - https://repo.anaconda.com/pkgs/main/linux-64::urllib3==1.24.1=py37_0
  - https://repo.anaconda.com/pkgs/main/linux-64::wheel==0.32.3=py37_0
  - https://repo.anaconda.com/pkgs/main/linux-64::yaml==0.1.7=had09818_2

[skyzh]

Related issue: ContinuumIO/anaconda-issues#7173

[doupongzeng]

Related issue: ContinuumIO/anaconda-issues#7173

感谢解决了问题。