编写程序，实现一个简单的计算器，实现加、减、乘、除以及整除、幂运算和平方根运算。单击clear按钮时清除文本框中的表达式，单击=按钮时计算文本框中表达式的值。要求进行必要的错误检查，例如，一个数据中不能包含多于一个的小数点，表达式中不能包括连续的运算符。

好的，以下是一个简单的计算器程序的示例代码：

from math import sqrt

def calculate(expression):
    # 检查表达式是否合法
    if '..' in expression or '+-' in expression or '-+' in expression or '//' in expression:
        return 'Error'
    try:
        result = eval(expression)
    except ZeroDivisionError:
        return 'Error'
    except:
        return 'Error'
    return result

def clear():
    # 清空文本框中的内容
    text.delete(0, END)

def button_click(button_text):
    # 将按钮文本添加到文本框中
    text.insert(END, button_text)
    
def button_clear():
    # 清空文本框中的内容
    clear()

def button_equal():
    # 计算表达式的值并显示结果
    expression = text.get()
    result = calculate(expression)
    clear()
    text.insert(END, result)

def button_sqrt():
    # 计算平方根并显示结果
    expression = text.get()
    try:
        result = sqrt(float(expression))
    except:
        result = 'Error'
    clear()
    text.insert(END, result)

# 创建一个窗口
window = Tk()
window.title('计算器')

# 创建一个文本框
text = Entry(window, width=30)
text.grid(row=0, column=0, columnspan=4)

# 创建数字和运算符按钮
button_1 = Button(window, text='1', command=lambda: button_click('1'))
button_1.grid(row=1, column=0)

button_2 = Button(window, text='2', command=lambda: button_click('2'))
button_2.grid(row=1, column=1)

button_3 = Button(window, text='3', command=lambda: button_click('3'))
button_3.grid(row=1, column=2)

button_4 = Button(window, text='4', command=lambda: button_click('4'))
button_4.grid(row=2, column=0)

button_5 = Button(window, text='5', command=lambda: button_click('5'))
button_5.grid(row=2, column=1)

button_6 = Button(window, text='6', command=lambda: button_click('6'))
button_6.grid(row=2, column=2)

button_7 = Button(window, text='7', command=lambda: button_click('7'))
button_7.grid(row=3, column=0)

button_8 = Button(window, text='8', command=lambda: button_click('8'))
button_8.grid(row=3, column=1)

button_9 = Button(window, text='9', command=lambda: button_click('9'))
button_9.grid(row=3, column=2)

button_0 = Button(window, text='0', command=lambda: button_click('0'))
button_0.grid(row=4, column=1)

button_decimal = Button(window, text='.', command=lambda: button_click('.'))
button_decimal.grid(row=4, column=2)

button_add = Button(window, text='+', command=lambda: button_click('+'))
button_add.grid(row=1, column=3)

button_minus = Button(window, text='-', command=lambda: button_click('-'))
button_minus.grid(row=2, column=3)

button_multiply = Button(window, text='*', command=lambda: button_click('*'))
button_multiply.grid(row=3, column=3)

button_divide = Button(window, text='/', command=lambda: button_click('/'))
button_divide.grid(row=4, column=3)

button_floor_divide = Button(window, text='//', command=lambda: button_click('//'))
button_floor_divide.grid(row=5, column=0)

button_power = Button(window, text='^', command=lambda: button_click('**'))
button_power.grid(row=5, column=1)

button_sqrt = Button(window, text='√', command=button_sqrt)
button_sqrt.grid(row=5, column=2)

# 创建清空和等于按钮
button_clear = Button(window, text='Clear', command=button_clear)
button_clear.grid(row=4, column=0)

button_equal = Button(window, text='=', command=button_equal)
button_equal.grid(row=5, column=3)

# 运行窗口
window.mainloop()

该程序使用了Python的tkinter库创建了一个简单的图形用户界面（GUI）。用户可以通过点击数字和运算符按钮来输入表达式，还可以点击清空和等于按钮进行操作。程序还包含了错误检查，例如不能包含多余的小数点或连续的运算符。