PyQt: QTextEdit 设置 QTextCharFormat 第一个块输入时块字体格式无效，将光标移动到块开头即可

import sys
from PyQt5.Qt import *


class Window(QWidget):
    def __init__(self):
        super().__init__()
        self.setup_ui()
        self.user_action()

    def setup_ui(self):
        self.setWindowTitle("Qt桌面应用程序")
        self.resize(300, 300)

        self.push_button = QPushButton(self)
        self.push_button.setText("按钮")
        self.push_button.move(50, 10)

        self.text_edit = QTextEdit(self)
        self.text_edit.resize(200, 200)
        self.text_edit.move(50, 50)

    def user_action(self):
        def push_button_clicked():
            text_edit_text_cursor = self.text_edit.textCursor()

            text_edit_text_cursor_text_char_format = QTextCharFormat()
            text_edit_text_cursor_text_char_format.setFontFamily("幼圆")
            text_edit_text_cursor_text_char_format.setFontPointSize(30)
            text_edit_text_cursor.setCharFormat(text_edit_text_cursor_text_char_format)
            text_edit_text_cursor.setBlockCharFormat(text_edit_text_cursor_text_char_format)

            text_edit_text_cursor_text_block_format = QTextBlockFormat()
            text_edit_text_cursor_text_block_format.setTextIndent(20)
            text_edit_text_cursor.setBlockFormat(text_edit_text_cursor_text_block_format)

            #第一个块输入时块字体格式无效，将光标移动到块开头即可
            text_edit_text_cursor.movePosition(QTextCursor.StartOfBlock, QTextCursor.MoveAnchor, 1)
            self.text_edit.setTextCursor(text_edit_text_cursor)

            self.text_edit.setFocus()

        self.push_button.clicked.connect(push_button_clicked)


if __name__ == '__main__':
    app = QApplication(sys.argv)
    window = Window()
    window.show()
    sys.exit(app.exec_())