QPushButton或QToolButton的颜色

from PyQt5.QtWidgets import QApplication, QPushButton, QToolButton, QVBoxLayout, QWidget

app = QApplication([])

window = QWidget()
layout = QVBoxLayout(window)

push_button = QPushButton("QPushButton")
push_button.setStyleSheet("background-color: red; color: white;")
layout.addWidget(push_button)

tool_button = QToolButton()
tool_button.setText("QToolButton")
tool_button.setStyleSheet("background-color: blue; color: white;")
layout.addWidget(tool_button)

window.show()
app.exec_()