There are many online video tutorials for maya, python and pyqt. Which will give you access to some in depth knowledge of maya and python programming in maya. Some are covered with pyqt also. Here is some and feel free to add more here.

• https://www.udemy.com/python-for-maya/learn/v4/overview By Dhruv Govil
• https://cmivfx.com/products/316-pyqt4-ui-development-for-maya By Justin
• https://cmivfx.com/products/167-python-introduction-vol-01---maya By Justin
• https://cmivfx.com/products/173-python-for-maya-vol-02 By Justin
• https://www.cgcircuit.com/bundle-details.php?val=21 Math and Maya API