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从 .yml 文件创建环境时出现问题，引发错误“CondaEnvException: Pip failed”

我正在尝试基于 .yml 文件创建一个环境，文件名是env.yml. 我在终端上运行以下代码片段：

conda env create -f env.yml

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然后 anaconda 开始安装 .yml 文件中列出的所有包，直到它安装到使用 pip 安装的包。它引发以下错误：

Ran pip subprocess with arguments:
['/Users/danielribeiro/opt/anaconda3/envs/lz_env/bin/python', '-m', 'pip', 'install', '-U', '-r', '/Users/danielribeiro/opt/Python/condaenv.80zhk806.requirements.txt']
Pip subprocess output:
Collecting backports-lzma==0.0.13 (from -r /Users/danielribeiro/opt/Python/condaenv.80zhk806.requirements.txt (line 1))

Pip subprocess error:
  Could not find a version that satisfies the requirement backports-lzma==0.0.13 (from -r /Users/danielribeiro/opt/Python/condaenv.80zhk806.requirements.txt (line 1)) (from versions: )
No matching distribution found for backports-lzma==0.0.13 (from -r /Users/danielribeiro/opt/Python/condaenv.80zhk806.requirements.txt (line 1))


CondaEnvException: Pip failed

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我不确定为什么没有安装包 backport-lzma==0.0.13。我也尝试手动安装它