PYQT分离出现的print none 求大神帮忙看看

def onButtonClick(self):
    year1 = self.year()
    group1 = self.group()
    print(year1, group1)
def year(self):
    year = self.lineEdit_year.text()
    print(year)
def group(self):
    group = self.lineEdit_group.text()
    print(group)

大神们，我这边是UI转py，想进行分离，提取输入的lineEdit的数值用于其他函数但是，

print(year1, group1)的结果是 none none

求职，我是个小白，正在学习中

def onButtonClick(self):
    year1 = self.year()
    group1 = self.group()
    print(year1, group1)
def year(self):
    year = self.lineEdit_year.text()
    print(year)
    return year
def group(self):
    group = self.lineEdit_group.text()
    print(group)
    return group

year(),group()要有return，方法调用时，才能获取到值