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Description
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Bug summary
Attempting to IMPORT matplotlib under Python 3.7.x on a Win10Pro results in error: "ImportError: DLL load failed: The specific module could not be found".
DLL name not given.
However, first importing PyQt5, and only then importing matplotlib works as it should.
Code for reproduction
- install Python 3.7.x (tested both 3.7.2 and 3.7.3) on Win10Pro
- install matplotlib (version 3.1.0) with pip - installs fine, no issues
- install PyQt5 (version 5.12.2) with pip - installs fine, no issues
- start Python
- under Python, enter command: "import matplotlib"
Python 3.7.3 (v3.7.3:ef4ec6ed12, Mar 25 2019, 22:22:05) [MSC v.1916 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import matplotlib
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "C:\Program Files\Python37\lib\site-packages\matplotlib\__init__.py", line 200, in <module>
_check_versions()
File "C:\Program Files\Python37\lib\site-packages\matplotlib\__init__.py", line 194, in _check_versions
module = importlib.import_module(modname)
File "C:\Program Files\Python37\lib\importlib\__init__.py", line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
ImportError: DLL load failed: The specified module could not be found.
>>>
>>>
# importing matplotlib works fine when PyQt5 imported first
>>> import PyQt5
>>> import matplotlib
>>> import serial
>>>
>>> ^ZActual outcome
# see above
Expected outcome
using matplotlib should not depend on importing PyQt5 first; but when done, code works fine
Matplotlib version
- Operating system: Win10Pro
- Matplotlib version: 3.1.0
- Matplotlib backend (
print(matplotlib.get_backend())): TkAgg right after importing; in the full code using qt5agg - Python version: 3.7.2, 3.7.3, 64 bit
- Jupyter version (if applicable): n.a.
- Other libraries:
Python installed from Win installer
matplotlib and PyQt5 installed with pip
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