python - パッケージの現在のバージョンを pip インストールしないのはなぜですか?

Question

(1.0.28)pipの現在のバージョンをインストールできません。とpydotPyPiの両方が、このバージョンを利用可能な現在のバージョンとして報告しますが、yolk

pip -U pydot

私にくれます

Requirement already up-to-date: pydot in /Library/Python/2.7/site-packages
Requirement already up-to-date: pyparsing in /Library/Python/2.7/site-packages (from pydot)
Requirement already up-to-date: setuptools in /Library/Python/2.7/site-packages (from pydot)

現在のバージョンを強制する

pip -U pydot==1.0.28

私にくれます

Downloading/unpacking pydot==1.0.28
  Could not find a version that satisfies the requirement pydot==1.0.28 (from versions: 1.0.2)
  Some externally hosted files were ignored (use --allow-external to allow).
Cleaning up...
No distributions matching the version for pydot==1.0.28

そしてさえ

pip -U --allow-external pydot pydot==1.0.28

私にくれます

Downloading/unpacking pydot==1.0.28
  Could not find a version that satisfies the requirement pydot==1.0.28 (from versions: 1.0.2)
  Some insecure and unverifiable files were ignored (use --allow-unverified pydot to allow).
Cleaning up...
No distributions matching the version for pydot==1.0.28

Answer 1

これを試して：

pip install --allow-unverified pydot pydot==1.0.28