python简易计算器程序（Python 计算器）

本文目录一览：

• 1、如何使用python编程写一个加法计算器
• 2、用PYTHON2做个计算器，只要加减乘除
• 3、用python操作Windows的计算器。
• 4、如何用 Python 写一个带 GUI 的科学计算程序
• 5、如何运用Python编写简易计算器

如何使用python编程写一个加法计算器

1、打开idle。点击file，然后点击new file.这是创建一个新的文件。

新建一个文件之后，我们输入第一行代码，使用print函数，在屏幕上打印一句话，其中字符串要使用双引号，输入法要使用英文输入法，如果符号使用中文输入法输入，就会出现错误。print(“我们做一个两个整数相加的计算题！”)

同理，在屏幕上打印第二句话，与用户交互，提醒用户输入第一个数。

第三行调用input函数，将用户输入的内容赋值给a,这时候a收到的是字符串信息，所以需要下一步把字符串转换为整型。这输入计算机处理数据指令。

然后依照以上的步骤写第二个加数，和最后输出的和，注意最后一句打印结果时，引号内部是字符串形式，x+y是数值形式，所以需要在中间加上一个逗号。如果不加逗号就会提示错误信息，以上就是所有的程序编写完成，下一步就开始保存，命名，运行。如图所示

运行结果如下：

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用PYTHON2做个计算器，只要加减乘除

”’

命令行简易计算器

”’

import sys

class culate():

#加法

def add(self,a,b):

return a+b

#减法

def mut(self,a,b):

return a-b

#乘法

def sub(self,a,b):

return a*b

#除法

def mod(self,a,b):

return a/b

c=culate()

while True:

n=input(“请选择你的操作：\n1.加法\n2.减法\n3.乘法\n4.除法\n0.退出\n”)

if n==”0″:

break

elif n==”1″:

a=input(“请输入第一个数：”)

b=input(“请输入第二个数：”)

print(c.add(int(a),int(b)))

continue

elif n==”2″:

a=input(“请输入第一个数：”)

b=input(“请输入第二个数：”)

print(c.mut(int(a),int(b)))

continue

elif n==”3″:

a=input(“请输入第一个数：”)

b=input(“请输入第二个数：”)

print(c.sub(int(a),int(b)))

continue

elif n==”4″:

a=input(“请输入第一个数：”)

b=input(“请输入第二个数：”)

print(c.mod(int(a),int(b)))

continue

”’

结果：

请选择你的操作：

1.加法

2.减法

3.乘法

4.除法

0.退出

3

请输入第一个数：9

请输入第二个数：3

27

请选择你的操作：

1.加法

2.减法

3.乘法

4.除法

0.退出

4

请输入第一个数：9

请输入第二个数：3

3.0

请选择你的操作：

1.加法

2.减法

3.乘法

4.除法

0.退出

”’

用python操作Windows的计算器。

安装pywin32模块。

注意：乘法的优先级高，在计算器输入时要加括号！

代码：

import win32api,win32gui, win32con

import win32com.client

shell = win32com.client.Dispatch(“WScript.Shell”)

shell.Run(“calc”)

win32api.Sleep(1000)

shell.SendKeys(“200{+}”)

win32api.Sleep(1000)

shell.SendKeys(“{(}100\x2a2{)}”)

win32api.Sleep(1000)

shell.SendKeys(“-22”)

win32api.Sleep(1000)

shell.SendKeys(“=”)

h = win32gui.FindWindow(“SciCalc”, None)

edit = win32gui.FindWindowEx(h, None, ‘Edit’, None)

bufLen = 1024

buf = win32gui.PyMakeBuffer(bufLen)

n = win32gui.SendMessage(edit, win32con.WM_GETTEXT, bufLen, buf)

print buf[0:n]

win32api.Sleep(1000)

win32gui.SendMessage(h, win32con.WM_SYSCOMMAND, win32con.SC_CLOSE, 0);

运行结果：

378.

如何用 Python 写一个带 GUI 的科学计算程序

使用Tkinter图形库，如果你是用的linux系统 记得将第一行改为from tkinter import *

这个代码实现的挺简单，并不是很复杂的科学计算器界面，你可以以此为基础，添加自己想要的东西：给你个截图：

代码是如下， 我就不给你添注释了啊：

#!/usr/bin/env python3.4

from Tkinter import *

import parser

root = Tk()

root.title(‘Calculator’)

i = 0

def factorial():

“””Calculates the factorial of the number entered.”””

whole_string = display.get()

number = int(whole_string)

fact = 1

counter = number

try:

while counter 0:

fact = fact*counter

counter -= 1

clear_all()

display.insert(0, fact)

except Exception:

clear_all()

display.insert(0, “Error”)

def clear_all():

“””clears all the content in the Entry widget”””

display.delete(0, END)

def get_variables(num):

“””Gets the user input for operands and puts it inside the entry widget”””

global i

display.insert(i, num)

i += 1

def get_operation(operator):

“””Gets the operand the user wants to apply on the functions”””

global i

length = len(operator)

display.insert(i, operator)

i += length

def undo():

“””removes the last entered operator/variable from entry widget”””

whole_string = display.get()

if len(whole_string): ## repeats until

## now just decrement the string by one index

new_string = whole_string[:-1]

print(new_string)

clear_all()

display.insert(0, new_string)

else:

clear_all()

display.insert(0, “Error, press AC”)

def calculate():

“””

Evaluates the expression

ref :

“””

whole_string = display.get()

try:

formulae = parser.expr(whole_string).compile()

result = eval(formulae)

clear_all()

display.insert(0, result)

except Exception:

clear_all()

display.insert(0, “Error!”)

root.columnconfigure(0,pad=3)

root.columnconfigure(1,pad=3)

root.columnconfigure(2,pad=3)

root.columnconfigure(3,pad=3)

root.columnconfigure(4,pad=3)

root.rowconfigure(0,pad=3)

root.rowconfigure(1,pad=3)

root.rowconfigure(2,pad=3)

root.rowconfigure(3,pad=3)

display = Entry(root, font = (“Calibri”, 13))

display.grid(row = 1, columnspan = 6 , sticky = W+E)

one = Button(root, text = “1”, command = lambda : get_variables(1), font=(“Calibri”, 12))

one.grid(row = 2, column = 0)

two = Button(root, text = “2”, command = lambda : get_variables(2), font=(“Calibri”, 12))

two.grid(row = 2, column = 1)

three = Button(root, text = “3”, command = lambda : get_variables(3), font=(“Calibri”, 12))

three.grid(row = 2, column = 2)

four = Button(root, text = “4”, command = lambda : get_variables(4), font=(“Calibri”, 12))

four.grid(row = 3 , column = 0)

five = Button(root, text = “5”, command = lambda : get_variables(5), font=(“Calibri”, 12))

five.grid(row = 3, column = 1)

six = Button(root, text = “6”, command = lambda : get_variables(6), font=(“Calibri”, 12))

six.grid(row = 3, column = 2)

seven = Button(root, text = “7”, command = lambda : get_variables(7), font=(“Calibri”, 12))

seven.grid(row = 4, column = 0)

eight = Button(root, text = “8”, command = lambda : get_variables(8), font=(“Calibri”, 12))

eight.grid(row = 4, column = 1)

nine = Button(root , text = “9”, command = lambda : get_variables(9), font=(“Calibri”, 12))

nine.grid(row = 4, column = 2)

cls = Button(root, text = “AC”, command = clear_all, font=(“Calibri”, 12), foreground = “red”)

cls.grid(row = 5, column = 0)

zero = Button(root, text = “0”, command = lambda : get_variables(0), font=(“Calibri”, 12))

zero.grid(row = 5, column = 1)

result = Button(root, text = “=”, command = calculate, font=(“Calibri”, 12), foreground = “red”)

result.grid(row = 5, column = 2)

plus = Button(root, text = “+”, command = lambda : get_operation(“+”), font=(“Calibri”, 12))

plus.grid(row = 2, column = 3)

minus = Button(root, text = “-“, command = lambda : get_operation(“-“), font=(“Calibri”, 12))

minus.grid(row = 3, column = 3)

multiply = Button(root,text = “*”, command = lambda : get_operation(“*”), font=(“Calibri”, 12))

multiply.grid(row = 4, column = 3)

divide = Button(root, text = “/”, command = lambda : get_operation(“/”), font=(“Calibri”, 12))

divide.grid(row = 5, column = 3)

# adding new operations

pi = Button(root, text = “pi”, command = lambda: get_operation(“*3.14”), font =(“Calibri”, 12))

pi.grid(row = 2, column = 4)

modulo = Button(root, text = “%”, command = lambda : get_operation(“%”), font=(“Calibri”, 12))

modulo.grid(row = 3, column = 4)

left_bracket = Button(root, text = “(“, command = lambda: get_operation(“(“), font =(“Calibri”, 12))

left_bracket.grid(row = 4, column = 4)

exp = Button(root, text = “exp”, command = lambda: get_operation(“**”), font = (“Calibri”, 10))

exp.grid(row = 5, column = 4)

## To be added :

# sin, cos, log, ln

undo_button = Button(root, text = “-“, command = undo, font =(“Calibri”, 12), foreground = “red”)

undo_button.grid(row = 2, column = 5)

fact = Button(root, text = “x!”, command = factorial, font=(“Calibri”, 12))

fact.grid(row = 3, column = 5)

right_bracket = Button(root, text = “)”, command = lambda: get_operation(“)”), font =(“Calibri”, 12))

right_bracket.grid(row = 4, column = 5)

square = Button(root, text = “^2”, command = lambda: get_operation(“**2”), font = (“Calibri”, 10))

square.grid(row = 5, column = 5)

root.mainloop()

如何运用Python编写简易计算器

import time

print(“计算器”)

print(“+等于加法模式 -等于减法模式 *等于乘法模式 /等于除法模式”)

while 2 1:

try:

print(“请输入+，-，*或/”)

a = input()

if a == “+”:

print(“请输入第1个加数”)

b = input()

print(“请输入第2个加数”)

c = input()

print(“计算中”)

time.sleep(0.3)

j = float(b) + float(c)

print(“等于”+str(j))

elif a == “-“:

print(“请输入被减数”)

b = input()

print(“请输入减数”)

c = input()

print(“计算中”)

time.sleep(0.3)

j = float(b) – float(c)

print(“等于”+str(j))

elif a == “*”:

print(“请输入第1个因数”)

b = input()

print(“请输入第2个因数”)

c = input()

print(“计算中”)

time.sleep(0.3)

j = float(b) * float(c)

print(“等于”+str(j))

elif a == “/”:

print(“……等于余数模式 .等于小数模式”)

print(“请输入……或.”)

a = input()

if a == “.”:

print(“请输入被除数”)

b = input()

print(“请输入除数”)

c = input()

print(“计算中”)

time.sleep(0.3)

j = float(b) / float(c)

print(“等于”+str(j))

if c == “0”:

print(“除数不能为0！”)

elif a == “……”:

print(“请输入被除数”)

b = input()

print(“请输入除数”)

c = input()

j = float(b) // float(c)

e = float(b) % float(c)

print(“等于”+str(j)+”……”+str(e))

if c == “0”:

print(“除数不能为0！”)

except Exception as e:

print(“您输入的内容有错误”)