已安装PyDSTool 0.90.2但无法识别SciPy版本，求解决方案

我已执行命令pip install PyDSTool==0.90.2安装PyDSTool包，终端返回信息如下：
Requirement already satisfied: PyDSTool0.90.2 in /usr/local/lib/python2.7/dist-packages/PyDSTool-0.90.2-py2.7.egg
Requirement already satisfied: six in /usr/local/lib/python2.7/dist-packages (from PyDSTool0.90.2)
Requirement already satisfied: scipy>=0.9 in /usr/local/lib/python2.7/dist-packages (from PyDSTool==0.90.2)
Requirement already satisfied: numpy>=1.6 in /usr/local/lib/python2.7/dist-packages (from Py...
但目前遇到PyDSTool无法识别SciPy版本的问题，恳请提供解决方案。

Hey, let's work through this PyDSTool and SciPy version recognition issue step by step. Here are actionable fixes you can try:

1. First, confirm your actual SciPy version #

Pip's "already satisfied" message doesn't always tell the full story—let's check the exact SciPy version your Python 2.7 environment is running. Run this command in your terminal:

python -c "import scipy; print('Installed SciPy version:', scipy.__version__)"

PyDSTool 0.90.2 is an older package built for Python 2.7, and it often struggles to recognize newer SciPy releases (like the 1.x series, which are the last compatible with Python 2.7).

2. Downgrade SciPy to a compatible version #

If your SciPy version is newer than 0.19.x, try downgrading to a version that's proven to work with PyDSTool 0.90.2:

pip install scipy==0.19.1

This version is stable, fully supports Python 2.7, and should be correctly detected by PyDSTool's version check logic.

3. Fix PyDSTool's internal version check (if downgrading isn't an option) #

If you need to keep your current SciPy version, you can tweak PyDSTool's source code to adjust its version detection:

• Locate the PyDSTool installation directory (from your pip output, it's /usr/local/lib/python2.7/dist-packages/PyDSTool-0.90.2-py2.7.egg)
• Find the file handling version checks (usually PyDSTool/config.py or PyDSTool/__init__.py)
• Look for code similar to this:

  from distutils.version import LooseVersion
  import scipy
  if LooseVersion(scipy.__version__) < LooseVersion('0.9'):
      raise RuntimeError("SciPy version too old")
  

• Ensure it's using LooseVersion (not strict string comparison) to properly parse version numbers. If it already is, double-check that the comparison logic isn't incorrectly flagging valid newer versions.

4. Verify you're using the right Python environment #

Make sure the Python interpreter running your code matches the one where PyDSTool and SciPy are installed. Run this to confirm:

python -c "import sys, scipy, PyDSTool; print('Python executable:', sys.executable); print('SciPy path:', scipy.__file__); print('PyDSTool path:', PyDSTool.__file__)"

If the paths don't point to /usr/local/lib/python2.7/dist-packages, you might be accidentally using a different Python environment.

内容的提问来源于stack exchange，提问作者Dadep