Visual calculator EE308

[832101120郑梓欣]

Assignment Table

 

information	Detail
Class Link	https://bbs.csdn.net/forums/ssynkqtd-04
Project requirement	https://bbs.csdn.net/topics/617332156
The Aim of This Assignment	Develop a visual calculator
MU STU ID and FZU STU ID	832101120/21126518

 

PSP Table

Personal Software Process Stages	Estimated Time（minutes）	Actual Time（minutes）
Planning	50	60
• Estimate	50	60
Development	300	350
• Analysis	20	20
• Design Spec	20	20
• Design Review	10	10
• Coding Standard	10	10
• Design	60	60
• Coding	100	150
• Code Review	50	50
• Test	30	30
• Analysis	100	120
Reporting	60	70
• Test Repor	10	10
• Size Measurement	30	40
Sum	450	530

 

Description of problem-solving ideas

①How I think about the question
On this issue, the first thing I think about is how to achieve the function of addition, subtraction, multiplication and division, and how to achieve the visual interface, how to design the visual interface, and finally I choose to use Python to achieve these functions.

②Find Information
After reading and learning related materials on CSDN, Github, and I learned the tkinter module can be used in this project.

③Design and Implementation process
First design the visual calculator interface, size, title and so on. Then design interactive buttons to achieve functions 

 

Code Description

import tkinter  

root = tkinter.Tk()
root.minsize(280, 500)


result = tkinter.StringVar()
result.set(0) 
result2 = tkinter.StringVar()  

label = tkinter.Label(root, font=('宋体', 20), bg='#EEE9E9', bd='9', fg='#828282', anchor='se', textvariable
=result2)
label.place(width=280, height=170)
label2 = tkinter.Label(root, font=('宋体', 30), bg='#EEE9E9', bd='9', fg='black', anchor='se', textvariable
=result)
label2.place(y=170, width=280, height=60)

# Numbers buttons

btn7 = tkinter.Button(root, text='7', font=('宋体', 20), fg=('#4F4F4F'), bd=0.5, command=lambda:
pressNum('7'))
btn7.place(x=0, y=285, width=70, height=55)
btn8 = tkinter.Button(root, text='8', font=('宋体', 20), fg=('#4F4F4F'), bd=0.5, command=lambda:
pressNum('8'))
btn8.place(x=70, y=285, width=70, height=55)
btn9 = tkinter.Button(root, text='9', font=('宋体', 20), fg=('#4F4F4F'), bd=0.5, command=lambda:
pressNum('9'))
btn9.place(x=140, y=285, width=70, height=55)

btn4 = tkinter.Button(root, text='4', font=('宋体', 20), fg=('#4F4F4F'), bd=0.5, command=lambda:
pressNum('4'))
btn4.place(x=0, y=340, width=70, height=55)
btn5 = tkinter.Button(root, text='5', font=('宋体', 20), fg=('#4F4F4F'), bd=0.5, command=lambda:
pressNum('5'))
btn5.place(x=70, y=340, width=70, height=55)
btn6 = tkinter.Button(root, text='6', font=('宋体', 20), fg=('#4F4F4F'), bd=0.5, command=lambda:
pressNum('6'))
btn6.place(x=140, y=340, width=70, height=55)

btn1 = tkinter.Button(root, text='1', font=('宋体', 20), fg=('#4F4F4F'), bd=0.5, command=lambda:
pressNum('1'))
btn1.place(x=0, y=395, width=70, height=55)
btn2 = tkinter.Button(root, text='2', font=('宋体', 20), fg=('#4F4F4F'), bd=0.5, command=lambda:
pressNum('2'))
btn2.place(x=70, y=395, width=70, height=55)
btn3 = tkinter.Button(root, text='3', font=('宋体', 20), fg=('#4F4F4F'), bd=0.5, command=lambda:
pressNum('3'))
btn3.place(x=140, y=395, width=70, height=55)
btn0 = tkinter.Button(root, text='0', font=('宋体', 20), fg=('#4F4F4F'), bd=0.5, command=lambda:
pressNum('0'))
btn0.place(x=70, y=450, width=70, height=55)

# Operation symbol buttons
btnac = tkinter.Button(root, text='AC', bd=0.5, font=('黑体', 20), fg='orange', command=lambda: pressCompute('AC'))
btnac.place(x=0, y=230, width=70, height=55)
btnback = tkinter.Button(root, text='←', font=('宋体', 20), fg='#4F4F4F', bd=0.5, command=lambda:
pressCompute('b'))
btnback.place(x=70, y=230, width=70, height=55)
btndivi = tkinter.Button(root, text='÷', font=('宋体', 20), fg='#4F4F4F', bd=0.5, command=lambda:
pressCompute('/'))
btndivi.place(x=140, y=230, width=70, height=55)
btnmul = tkinter.Button(root, text='×', font=('宋体', 20), fg="#4F4F4F", bd=0.5, command=lambda:
pressCompute('*'))
btnmul.place(x=210, y=230, width=70, height=55)
btnsub = tkinter.Button(root, text='-', font=('宋体', 20), fg=('#4F4F4F'), bd=0.5, command=lambda:
pressCompute('-'))
btnsub.place(x=210, y=285, width=70, height=55)
btnadd = tkinter.Button(root, text='+', font=('宋体', 20), fg=('#4F4F4F'), bd=0.5, command=lambda:
pressCompute('+'))
btnadd.place(x=210, y=340, width=70, height=55)
btnequ = tkinter.Button(root, text='=', bg='orange', font=('宋体', 20), fg=('#4F4F4F'), bd=0.5, command=
lambda: pressEqual())
btnequ.place(x=210, y=395, width=70, height=110)
btnper = tkinter.Button(root, text='%', font=('宋体', 20), fg=('#4F4F4F'), bd=0.5, command=lambda:
pressCompute('%'))
btnper.place(x=0, y=450, width=70, height=55)
btnpoint = tkinter.Button(root, text='.', font=('宋体', 20), fg=('#4F4F4F'), bd=0.5, command=lambda:
pressCompute('.'))
btnpoint.place(x=140, y=450, width=70, height=55)

# Operating function
lists = []  
isPressSign = False  
isPressNum = False


# Numerical function
def pressNum(num):  
    global lists 
    global isPressSign
    if isPressSign == False:
        pass
    else:  
        result.set(0)
        isPressSign = False

   
    oldnum = result.get()  
    if oldnum == '0':  
        result.set(num)
    else:  
        newnum = oldnum + num
        result.set(newnum) 


# Operational function
def pressCompute(sign):
    global lists
    global isPressSign
    num = result.get() 
    lists.append(num)  

    lists.append(sign)
    isPressSign = True

    if sign == 'AC': 
        lists.clear()
        result.set(0)
    if sign == 'b':  
        a = num[0:-1]
        lists.clear()
        result.set(a)


# Gets the result function
def pressEqual():
    global lists
    global isPressSign

    curnum = result.get() 
    lists.append(curnum)

    computrStr = ''.join(lists) 
    endNum = eval(computrStr) 
    #    a = str(endNum)
    #   b = '='+a                       
    #   c = b[0:10]                     
    result.set(endNum)  
    result2.set(computrStr)  
    lists.clear() 


root.mainloop()

 result functions

 Summarize this assignment

In this project, I implemented some features I didn't know about before, such as python's tkinter library. I spend a lot of time searching the Internet for relevant information (this part of the time I calculate into code). If I want to use python to develop some small programs similar to calculators in the future, I should have a further understanding of the function library such as tkinter, which has great practical significance, enhance the search ability and reduce the time for searching unknown knowledge.