如何在不影响其他文件的情况下降级python版本
How to downgrade python version without affecting other files
当我在 python 3.8.0 中安装 tensorflow 时，它显示错误。如何在不影响其他文件的情况下降级python版本。
(base) C:\Users\Akanksha-Lab-PC>pip uninstall python 3.8.4
WARNING: Skipping python as it is not installed.
WARNING: Skipping 3.8.4 as it is not installed.
(base) C:\Users\Akanksha-Lab-PC>pip uninstall python-3.8.4
WARNING: Skipping python-3.8.4 as it is not installed.
(base) C:\Users\Akanksha-Lab-PC>make altinstall python-3.7
'make' is not recognized as an internal or external command,
operable program or batch file.
(base) C:\Users\Akanksha-Lab-PC>pip install python-3.7
ERROR: Could not find a version that satisfies the requirement python-3.7 (from versions: none)
ERROR: No matching distribution found for python-3.7
当我键入命令 pip show tensorflow 时，它会给我这个
(base) C:\Users\Akanksha-Lab-PC>python --version
Python 3.8.5
(base) C:\Users\Akanksha-Lab-PC>pip show tensorflow
WARNING: Package(s) not found: tensorflow
当我使用此命令安装 tensorflow 时：
pip install tensorflow
它给出了这个错误
(base) C:\Users\Akanksha-Lab-PC>pip install tensorflow
Collecting tensorflow
Using cached tensorflow-2.4.1-cp38-cp38-win_amd64.whl (370.7 MB)
Requirement already satisfied: six~=1.15.0 in c:\programdata\anaconda3\lib\site-packages (from tensorflow) (1.15.0)
Collecting astunparse~=1.6.3
Using cached astunparse-1.6.3-py2.py3-none-any.whl (12 kB)
Requirement already satisfied: protobuf>=3.9.2 in c:\programdata\anaconda3\lib\site-packages (from tensorflow) (3.14.0)
Requirement already satisfied: typing-extensions~=3.7.4 in c:\programdata\anaconda3\lib\site-packages (from tensorflow) (3.7.4.3)
Requirement already satisfied: wheel~=0.35 in c:\programdata\anaconda3\lib\site-packages (from tensorflow) (0.35.1)
Requirement already satisfied: numpy~=1.19.2 in c:\programdata\anaconda3\lib\site-packages (from tensorflow) (1.19.2)
Processing c:\users\akanksha-lab-pc\appdata\local\pip\cache\wheels\a0c73df82468f958445479c59e784896fa24f4a5fc024b0f501\termcolor-1.1.0-py3-none-any.whl
Requirement already satisfied: flatbuffers~=1.12.0 in c:\programdata\anaconda3\lib\site-packages (from tensorflow) (1.12)
Collecting absl-py~=0.10
Using cached absl_py-0.11.0-py3-none-any.whl (127 kB)
Requirement already satisfied: h5py~=2.10.0 in c:\programdata\anaconda3\lib\site-packages (from tensorflow) (2.10.0)
Collecting keras-preprocessing~=1.1.2
Using cached Keras_Preprocessing-1.1.2-py2.py3-none-any.whl (42 kB)
Requirement already satisfied: google-pasta~=0.2 in c:\programdata\anaconda3\lib\site-packages (from tensorflow) (0.2.0)
Collecting gast==0.3.3
Using cached gast-0.3.3-py2.py3-none-any.whl (9.7 kB)
Collecting grpcio~=1.32.0
Using cached grpcio-1.32.0-cp38-cp38-win_amd64.whl (2.6 MB)
Collecting tensorflow-estimator<2.5.0,>=2.4.0
Using cached tensorflow_estimator-2.4.0-py2.py3-none-any.whl (462 kB)
Collecting tensorboard~=2.4
Using cached tensorboard-2.4.1-py3-none-any.whl (10.6 MB)
Collecting opt-einsum~=3.3.0
Using cached opt_einsum-3.3.0-py3-none-any.whl (65 kB)
Processing c:\users\akanksha-lab-pc\appdata\local\pip\cache\wheelsf\fde\b6cf5890494cb8ef0b5eaff72e5d55a70fb56316007d6dfe73\wrapt-1.12.1-py3-none-any.whl
Collecting google-auth-oauthlib<0.5,>=0.4.1
Using cached google_auth_oauthlib-0.4.2-py2.py3-none-any.whl (18 kB)
Requirement already satisfied: setuptools>=41.0.0 in c:\programdata\anaconda3\lib\site-packages (from tensorboard~=2.4->tensorflow) (50.3.1.post20201107)
Collecting markdown>=2.6.8
Using cached Markdown-3.3.3-py3-none-any.whl (96 kB)
Collecting google-auth<2,>=1.6.3
Using cached google_auth-1.24.0-py2.py3-none-any.whl (114 kB)
Collecting tensorboard-plugin-wit>=1.6.0
Using cached tensorboard_plugin_wit-1.8.0-py3-none-any.whl (781 kB)
Requirement already satisfied: requests<3,>=2.21.0 in c:\programdata\anaconda3\lib\site-packages (from tensorboard~=2.4->tensorflow) (2.24.0)
Requirement already satisfied: werkzeug>=0.11.15 in c:\programdata\anaconda3\lib\site-packages (from tensorboard~=2.4->tensorflow) (1.0.1)
Collecting requests-oauthlib>=0.7.0
Using cached requests_oauthlib-1.3.0-py2.py3-none-any.whl (23 kB)
Collecting pyasn1-modules>=0.2.1
Using cached pyasn1_modules-0.2.8-py2.py3-none-any.whl (155 kB)
Collecting cachetools<5.0,>=2.0.0
Using cached cachetools-4.2.1-py3-none-any.whl (12 kB)
Collecting rsa<5,>=3.1.4; python_version >= "3.6"
Using cached rsa-4.7-py3-none-any.whl (34 kB)
Requirement already satisfied: certifi>=2017.4.17 in c:\programdata\anaconda3\lib\site-packages (from requests<3,>=2.21.0->tensorboard~=2.4->tensorflow) (2020.6.20)
Requirement already satisfied: idna<3,>=2.5 in c:\programdata\anaconda3\lib\site-packages (from requests<3,>=2.21.0->tensorboard~=2.4->tensorflow) (2.10)
Requirement already satisfied: chardet<4,>=3.0.2 in c:\programdata\anaconda3\lib\site-packages (from requests<3,>=2.21.0->tensorboard~=2.4->tensorflow) (3.0.4)
Requirement already satisfied: urllib3!=1.25.0,!=1.25.1,<1.26,>=1.21.1 in c:\programdata\anaconda3\lib\site-packages (from requests<3,>=2.21.0->tensorboard~=2.4->tensorflow) (1.25.11)
Collecting oauthlib>=3.0.0
Using cached oauthlib-3.1.0-py2.py3-none-any.whl (147 kB)
Collecting pyasn1<0.5.0,>=0.4.6
Using cached pyasn1-0.4.8-py2.py3-none-any.whl (77 kB)
Installing collected packages: astunparse, termcolor, absl-py, keras-preprocessing, gast, grpcio, tensorflow-estimator, oauthlib, requests-oauthlib, pyasn1, pyasn1-modules, cachetools, rsa, google-auth, google-auth-oauthlib, markdown, tensorboard-plugin-wit, tensorboard, opt-einsum, wrapt, tensorflow
Attempting uninstall: wrapt
Found existing installation: wrapt 1.11.2
Uninstalling wrapt-1.11.2:
ERROR: Could not install packages due to an EnvironmentError: [WinError 5] Access is denied: 'c:\programdata\anaconda3\lib\site-packages\wrapt-1.11.2.dist-info\INSTALLER'
Consider using the `--user` option or check the permissions.
谁能告诉我这个问题的解决方案？
pip uninstall python 3.8.4
这个命令永远不会起作用。 pip 是一个 python 包管理器，即对于 python 的安装，pip 负责将模块安装到 python 安装。它不管理 python 本身的安装
关于你安装tensorflow的错误：
pip install tensorflow
和
ERROR: Could not install packages due to an EnvironmentError: [WinError 5] Access is denied: 'c:\programdata\anaconda3\lib\site-packages\wrapt-1.11.2.dist-info\INSTALLER'
这是因为 c:\programdata 对非管理员用户进行了写保护，因此为了使您的命令成功，您应该 运行 您的 cmd 为管理员。
但是:
您似乎已经安装了 anaconda，并且正在尝试使用 pip 将 tensorflow 安装到基础环境中。 Pip 依次尝试卸载一些已经存在的包，可能是为了满足 tensorflow 的要求。但是当你第一次安装 anaconda 时，已经存在的包可能是由 conda 安装的，所以你在这里进入危险的水域并且有破坏你的基础环境的风险，所以两个建议：
- 创建新环境
conda create -n tf tensorflow-gpu
- 使用conda命令安装tensorflow。
conda install tensorflow-gpu 会给你tensorflow
关于你的另一个问题：
How to downgrade python
解决办法也是使用conda命令：
conda install python=<some version>
或者，更好的是，只需创建一个具有您需要的版本的环境：
conda create -n py37 python=3.7
例如， 会为您提供一个名为 py37 的环境，其中安装了 python3.7。它可以被激活并与
一起使用
conda activate py37
当我在 python 3.8.0 中安装 tensorflow 时，它显示错误。如何在不影响其他文件的情况下降级python版本。
(base) C:\Users\Akanksha-Lab-PC>pip uninstall python 3.8.4
WARNING: Skipping python as it is not installed.
WARNING: Skipping 3.8.4 as it is not installed.
(base) C:\Users\Akanksha-Lab-PC>pip uninstall python-3.8.4
WARNING: Skipping python-3.8.4 as it is not installed.
(base) C:\Users\Akanksha-Lab-PC>make altinstall python-3.7
'make' is not recognized as an internal or external command,
operable program or batch file.
(base) C:\Users\Akanksha-Lab-PC>pip install python-3.7
ERROR: Could not find a version that satisfies the requirement python-3.7 (from versions: none)
ERROR: No matching distribution found for python-3.7
当我键入命令 pip show tensorflow 时，它会给我这个
(base) C:\Users\Akanksha-Lab-PC>python --version
Python 3.8.5
(base) C:\Users\Akanksha-Lab-PC>pip show tensorflow
WARNING: Package(s) not found: tensorflow
当我使用此命令安装 tensorflow 时：
pip install tensorflow
它给出了这个错误
(base) C:\Users\Akanksha-Lab-PC>pip install tensorflow
Collecting tensorflow
Using cached tensorflow-2.4.1-cp38-cp38-win_amd64.whl (370.7 MB)
Requirement already satisfied: six~=1.15.0 in c:\programdata\anaconda3\lib\site-packages (from tensorflow) (1.15.0)
Collecting astunparse~=1.6.3
Using cached astunparse-1.6.3-py2.py3-none-any.whl (12 kB)
Requirement already satisfied: protobuf>=3.9.2 in c:\programdata\anaconda3\lib\site-packages (from tensorflow) (3.14.0)
Requirement already satisfied: typing-extensions~=3.7.4 in c:\programdata\anaconda3\lib\site-packages (from tensorflow) (3.7.4.3)
Requirement already satisfied: wheel~=0.35 in c:\programdata\anaconda3\lib\site-packages (from tensorflow) (0.35.1)
Requirement already satisfied: numpy~=1.19.2 in c:\programdata\anaconda3\lib\site-packages (from tensorflow) (1.19.2)
Processing c:\users\akanksha-lab-pc\appdata\local\pip\cache\wheels\a0c73df82468f958445479c59e784896fa24f4a5fc024b0f501\termcolor-1.1.0-py3-none-any.whl
Requirement already satisfied: flatbuffers~=1.12.0 in c:\programdata\anaconda3\lib\site-packages (from tensorflow) (1.12)
Collecting absl-py~=0.10
Using cached absl_py-0.11.0-py3-none-any.whl (127 kB)
Requirement already satisfied: h5py~=2.10.0 in c:\programdata\anaconda3\lib\site-packages (from tensorflow) (2.10.0)
Collecting keras-preprocessing~=1.1.2
Using cached Keras_Preprocessing-1.1.2-py2.py3-none-any.whl (42 kB)
Requirement already satisfied: google-pasta~=0.2 in c:\programdata\anaconda3\lib\site-packages (from tensorflow) (0.2.0)
Collecting gast==0.3.3
Using cached gast-0.3.3-py2.py3-none-any.whl (9.7 kB)
Collecting grpcio~=1.32.0
Using cached grpcio-1.32.0-cp38-cp38-win_amd64.whl (2.6 MB)
Collecting tensorflow-estimator<2.5.0,>=2.4.0
Using cached tensorflow_estimator-2.4.0-py2.py3-none-any.whl (462 kB)
Collecting tensorboard~=2.4
Using cached tensorboard-2.4.1-py3-none-any.whl (10.6 MB)
Collecting opt-einsum~=3.3.0
Using cached opt_einsum-3.3.0-py3-none-any.whl (65 kB)
Processing c:\users\akanksha-lab-pc\appdata\local\pip\cache\wheelsf\fde\b6cf5890494cb8ef0b5eaff72e5d55a70fb56316007d6dfe73\wrapt-1.12.1-py3-none-any.whl
Collecting google-auth-oauthlib<0.5,>=0.4.1
Using cached google_auth_oauthlib-0.4.2-py2.py3-none-any.whl (18 kB)
Requirement already satisfied: setuptools>=41.0.0 in c:\programdata\anaconda3\lib\site-packages (from tensorboard~=2.4->tensorflow) (50.3.1.post20201107)
Collecting markdown>=2.6.8
Using cached Markdown-3.3.3-py3-none-any.whl (96 kB)
Collecting google-auth<2,>=1.6.3
Using cached google_auth-1.24.0-py2.py3-none-any.whl (114 kB)
Collecting tensorboard-plugin-wit>=1.6.0
Using cached tensorboard_plugin_wit-1.8.0-py3-none-any.whl (781 kB)
Requirement already satisfied: requests<3,>=2.21.0 in c:\programdata\anaconda3\lib\site-packages (from tensorboard~=2.4->tensorflow) (2.24.0)
Requirement already satisfied: werkzeug>=0.11.15 in c:\programdata\anaconda3\lib\site-packages (from tensorboard~=2.4->tensorflow) (1.0.1)
Collecting requests-oauthlib>=0.7.0
Using cached requests_oauthlib-1.3.0-py2.py3-none-any.whl (23 kB)
Collecting pyasn1-modules>=0.2.1
Using cached pyasn1_modules-0.2.8-py2.py3-none-any.whl (155 kB)
Collecting cachetools<5.0,>=2.0.0
Using cached cachetools-4.2.1-py3-none-any.whl (12 kB)
Collecting rsa<5,>=3.1.4; python_version >= "3.6"
Using cached rsa-4.7-py3-none-any.whl (34 kB)
Requirement already satisfied: certifi>=2017.4.17 in c:\programdata\anaconda3\lib\site-packages (from requests<3,>=2.21.0->tensorboard~=2.4->tensorflow) (2020.6.20)
Requirement already satisfied: idna<3,>=2.5 in c:\programdata\anaconda3\lib\site-packages (from requests<3,>=2.21.0->tensorboard~=2.4->tensorflow) (2.10)
Requirement already satisfied: chardet<4,>=3.0.2 in c:\programdata\anaconda3\lib\site-packages (from requests<3,>=2.21.0->tensorboard~=2.4->tensorflow) (3.0.4)
Requirement already satisfied: urllib3!=1.25.0,!=1.25.1,<1.26,>=1.21.1 in c:\programdata\anaconda3\lib\site-packages (from requests<3,>=2.21.0->tensorboard~=2.4->tensorflow) (1.25.11)
Collecting oauthlib>=3.0.0
Using cached oauthlib-3.1.0-py2.py3-none-any.whl (147 kB)
Collecting pyasn1<0.5.0,>=0.4.6
Using cached pyasn1-0.4.8-py2.py3-none-any.whl (77 kB)
Installing collected packages: astunparse, termcolor, absl-py, keras-preprocessing, gast, grpcio, tensorflow-estimator, oauthlib, requests-oauthlib, pyasn1, pyasn1-modules, cachetools, rsa, google-auth, google-auth-oauthlib, markdown, tensorboard-plugin-wit, tensorboard, opt-einsum, wrapt, tensorflow
Attempting uninstall: wrapt
Found existing installation: wrapt 1.11.2
Uninstalling wrapt-1.11.2:
ERROR: Could not install packages due to an EnvironmentError: [WinError 5] Access is denied: 'c:\programdata\anaconda3\lib\site-packages\wrapt-1.11.2.dist-info\INSTALLER'
Consider using the `--user` option or check the permissions.
谁能告诉我这个问题的解决方案？
pip uninstall python 3.8.4
这个命令永远不会起作用。 pip 是一个 python 包管理器，即对于 python 的安装，pip 负责将模块安装到 python 安装。它不管理 python 本身的安装
关于你安装tensorflow的错误：
pip install tensorflow
和
ERROR: Could not install packages due to an EnvironmentError: [WinError 5] Access is denied: 'c:\programdata\anaconda3\lib\site-packages\wrapt-1.11.2.dist-info\INSTALLER'
这是因为 c:\programdata 对非管理员用户进行了写保护，因此为了使您的命令成功，您应该 运行 您的 cmd 为管理员。
但是:
您似乎已经安装了 anaconda，并且正在尝试使用 pip 将 tensorflow 安装到基础环境中。 Pip 依次尝试卸载一些已经存在的包，可能是为了满足 tensorflow 的要求。但是当你第一次安装 anaconda 时，已经存在的包可能是由 conda 安装的，所以你在这里进入危险的水域并且有破坏你的基础环境的风险，所以两个建议：
- 创建新环境
conda create -n tf tensorflow-gpu - 使用conda命令安装tensorflow。
conda install tensorflow-gpu会给你tensorflow
关于你的另一个问题：
How to downgrade python
解决办法也是使用conda命令：
conda install python=<some version>
或者，更好的是，只需创建一个具有您需要的版本的环境：
conda create -n py37 python=3.7
会为您提供一个名为 py37 的环境，其中安装了 python3.7。它可以被激活并与
一起使用conda activate py37