Ошибка возникает при попытке обновления установленного пакета:
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$ pip install tornado --upgrade Collecting tornado Downloading https://files.pythonhosted.org/packages/45/ec/f2a03a05 09bcfca336bef23a3dab0d07504893af34 fd13064059ba4a0503/tornado-5.1.tar.gz (516kB) 100% |--------------------------------| 522kB 1.2MB/s. ... Successfully built tornado Installing collected packages: futures, singledispatch, backports-abc, tornado Found existing installation: tornado 3.2.2 Cannot uninstall 'tornado'. It is a distutils installed project and thus we cannot accurately determine which files belong to it which would lead to only a partial uninstall. |
Решение, используем опцию "--ignore-installed":
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$ pip install tornado --upgrade --ignore-installed Collecting tornado ... Installing collected packages: backports-abc, six, singledispatch, futures, tornado Successfully installed backports-abc-0.5 futures-3.2.0 singledispatch-3.4.0.3 six-1.11.0 tornado-5.1 |
Проверяем результат, версия пакета изменилась и он находится в списке не требующих обновления:
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$ pip list --uptodate Package Version -------------- ------- backports-abc 0.5 futures 3.2.0 MySQL-python 1.2.5 pip 18.0 singledispatch 3.4.0.3 six 1.11.0 SOAPpy 0.12.22 tornado 5.1 |