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我 pip'ed symfit，（https://pythonhosted.org/symfit/）它似乎已经安装，即：

C:\>pip install symfit

Collecting symfit
  Using cached https://files.pythonhosted.org/packages/6e/58/0a58f7a7e39c052afe790ae0989c070e1a2d1c7d472ae3cfd4ee785f1c55/symfit-0.4.5-py2.py3-none-any.whl

Collecting numpy>=1.12 (from symfit)
  Downloading https://files.pythonhosted.org/packages/d2/9a/e377ff2dabf66493ac607f6b45b4efeda898ad3fbc43b418bd7dba4a1d67/numpy-1.15.3-cp34-none-win_amd64.whl (13.5MB)

    100% |████████████████████████████████| 13.5MB 975kB/s
Collecting sympy<=1.1.1 (from symfit)
Collecting scipy>=1.0 (from symfit)
  Using cached https://files.pythonhosted.org/packages/6f/ee/cfce56ea456a809b983ac4089876dbffd15233c17df7bca1e35e84c3ce95/scipy-1.1.0-cp34-none-win_amd64.whl

Collecting mpmath>=0.19 (from sympy<=1.1.1->symfit)
Installing collected packages: numpy, mpmath, sympy, scipy, symfit

  Found existing installation: numpy 1.8.1
Cannot uninstall 'numpy'. 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.

但是当我尝试将它导入python程序时找不到它，并且

dir /s symfit

从驱动器的根目录找不到 symfit。

pip 将它放在哪里，我如何访问它？

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