我正在学习python中的matplotlib模块，我已经在命令提示符“ pip install matplotlib”中使用命令安装了该库 并显示已成功安装，并且在python 3.7 IDLE中， 当我输入import matplotlib时，我遇到此错误
Python 3.7.3 (v3.7.3:ef4ec6ed12, Mar 25 2019, 22:22:05) [MSC v.1916 64 bit (AMD64)] on win32
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>>> import matplotlib
Traceback (most recent call last):
File "<pyshell#0>", line 1, in <module>
import matplotlib
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.