python实现多功能计算器
核心语句:
eval语句,具有自动计算功能
借助tkinter完成图形界面描述
流程如下:
- 创建界面:
from tkinter import *
win=Tk()
win.title('计算器')
win.geometry('450x680')
结果如下:
2.放置按钮:
but7=Button(win,text=7,width=3,font=('Arial',31),command=lambda :numinput(7))#如果只是先添加命令可以先不添加command关键字
but8=Button(win,text=8,width=3,font=('Arial',31),command=lambda :numinput(8))
but9=Button(win,text=9,width=3,font=('Arial',31),command=lambda :numinput(9))
but4=Button(win,text=4,width=3,font=('Arial',31),command=lambda :numinput(4))
but5=Button(win,text=5,width=3,font=('Arial',31),command=lambda :numinput(5))
but6=Button(win,text=6,width=3,font=('Arial',31),command=lambda :numinput(6))
but1=Button(win,text=1,width=3,font=('Arial',31),command=lambda :numinput(1))
but2=Button(win,text=2,width=3,font=('Arial',31),command=lambda :numinput(2))
but3=Button(win,text=3,width=3,font=('Arial',31),command=lambda :numinput(3))
but0=Button(win,text=0,width=3,font=('Arial',31),command=lambda :numinput(0))
bu1=Button(win,text='ans',width=3,font=('Arial',31),command=ans_)
bu2=Button(win,text='π',width=3,font=('Arial',31),command=lambda :numinput(pi))
bu3=Button(win,text='e',width=3,font=('Arial',31),command=lambda :numinput(e))
bu4=Button(win,text='CE',width=3,font=('Arial',31),command=clear)
bu5=Button(win,text='del',width=3,font=('Arial',31),command=delete_n)
bu6=Button(win,text='x^2',width=3,font=('Arial',31),command=mi_2)
bu7=Button(win,text='1/x',width=3,font=('Arial',31),command=x_1)
bu8=Button(win,text='|x|',width=3,font=('Arial',31),command=juedui)
bu9=Button(win,text='exp',width=3,font=('Arial',31),command=lambda :add_char('exp'))
bu0=Button(win,text='mod',width=3,font=('Arial',31),command=lambda:add_char('%'))
b1=Button(win,text='sqrt()',width=3,font=('Arial',31),command=sqrt_)
b2=Button(win,text='(',width=3,font=('Arial',31),command=lambda :add_char('('))
b3=Button(win,text=')',width=3,font=('Arial',31),command=lambda :add_char(')'))
b4=Button(win,text='n!',width=3,font=('Arial',31),command=jiechen)
b5=Button(win,text='/',width=3,font=('Arial',31),command=lambda :add_char('/'))
b6=Button(win,text='x^y',width=3,font=('Arial',31),command=lambda :add_char('^'))
b7=Button(win,text='*',width=3,font=('Arial',31),command=lambda :add_char('*'))
b8=Button(win,text='10^x',width=3,font=('Arial',31),command=zhi_10)
b9=Button(win,text='-',width=3,font=('Arial',31),command=lambda :add_char('-'))
b0=Button(win,text='log',width=3,font=('Arial',31),command=log_)
b11=Button(win,text='+',width=3,font=('Arial',31),command=lambda :add_char('+'))
b12=Button(win,text='ln',width=3,font=('Arial',31),command=IN_)
b13=Button(win,text='+/-',width=3,font=('Arial',31),command=fu)
b14=Button(win,text='.',width=3,font=('Arial',31),command=lambda :add_char('.'))
b15=Button(win,text='=',width=3,font=('Arial',31),command=end1)
b6.place(x=0,y=320)
but7.place(x=90,y=320)
but8.place(x=180,y=320)
but9.place(x=270,y=320)
b7.place(x=360,y=320)
but4.place(x=90,y=410)
but5.place(x=180,y=410)
but6.place(x=270,y=410)
b8.place(x=0,y=410)
b9.place(x=360,y=410)
but1.place(x=90,y=500)
but2.place(x=180,y=500)
but3.place(x=270,y=500)
b0.place(x=0,y=500)
b11.place(x=360,y=500)
b13.place(x=90,y=590)
but0.place(x=180,y=590)
b14.place(x=270,y=590)
b12.place(x=0,y=590)
b15.place(x=360,y=590)
bu2.place(x=90,y=50)
bu3.place(x=180,y=50)
bu4.place(x=270,y=50)
bu1.place(x=0,y=50)
bu5.place(x=360,y=50)
bu7.place(x=90,y=140)
bu8.place(x=180,y=140)
bu9.place(x=270,y=140)
bu6.place(x=0,y=140)
bu0.place(x=360,y=140)
b2.place(x=90,y=230)
b3.place(x=180,y=230)
b4.place(x=270,y=230)
b1.place(x=0,y=230)
b5.place(x=360,y=230)
en=Entry(win,width=30,font=('Arial',20))
en.place(x=0,y=0)
结果如下:
- 为按钮添加执行命令(前面button创建时已经添加了,如果不添加可以先不加上command=关键字段):
ans=0.0
flag=0
falg=0
def er_yuan():
num=str(en.get())
for i in range(0,len(num)):
if (str.isdigit(num[i]) or num[i] == '.') == 0:
number=eval(num[0:i])
print(number)
en.delete(0,END)
if num[i]=='^':
en.insert(0,str(number**(eval(num[i+1:]))))
else:
en.insert(0,str(number*(10**eval(num[i+3:]))))
return
def numinput(number):
global flag
if (flag):
en.delete(0,END)
flag=0
first_num=en.get()
en.delete(0,END)
en.insert(0,str(first_num)+str(number))
def clear():
en.delete(0,END)
def delete_n():
en.delete(len(str(en.get()))-1,END)
def x_1():
num=str(en.get())
n=1
# if(num[-1]==')'):#如果想要整体做1/x可以使用加括号的方法
# en.delete(0,END)
# en.insert(0,str(1/eval(num[1:-2])))
# return
if(num[-1]==')'):
for i in range(len(num)-2,0,-1):
if(num[i]==')'):
n+=1
elif num[i]=='(':
n-=1
if(n==0):
en.delete(0,END)
# print(num[i+1:-2])
en.insert(0,num[0:i]+str(1/eval(num[i+1:-1])))
#注意切片也是满足左开右闭的情况，只有右侧不取数字时才有
# 可以得到从对应位置到最后的结果
return
for i in range(len(num)-1,0,-1):
if (str.isdigit(num[i]) or num[i]=='.')==0:
pp=float(num[i+1:])
if pp==0:
en.delete(0,END)
en.insert('error')
print('ok')
en.delete(0,END)
en.insert(0,num[0:i+1]+str(1/pp))
return
en.delete(0,END)
en.insert(0,str(1/float(num[0:])))
def mi_2():
num=str(en.get())
for i in range(len(num)-1,0,-1):#只需要读到第二个字符即可，因为如果第二个字符都不是字符
#则即使前面是字符也是属于单目符号(这里只有 自取负符号-）对结果无关紧要
if (str.isdigit(num[i]) or num[i]=='.')==0:
en.delete(0,END)
en.insert(0,num[0:i+1]+str(eval(num[i:])*eval(num[i:])))
return
en.delete(0,END)
en.insert(0,str(eval(num)*eval(num)))
#当点了=之后如果第一个为数字则就可以重新开始若要使用之前的数据可以使用ans
# 但是如果是使用的符号则需要使用之前的数字不做修改
def add_char(x):
global falg
if (x=='exp' or x=='^'):
falg=1
num = en.get()
en.delete(0,END)
global flag
if(flag):
en.insert(0,str(ans)+x)
flag=0
else:
en.insert(0, str(num) +x)
def end1():
global ans
global flag
global falg
# for i in str(en.get()):
if falg:
er_yuan()
falg=0
return
num=eval(str(en.get()))
en.delete(0,END)
en.insert(0,str(num))
ans=num
flag=1
def ans_():
global ans
num=en.get()
en.delete(0, END)
en.insert(0, str(num)+str(ans))
def juedui():
num = str(en.get())
en.delete(0, END)
en.insert(0, str(abs(eval(num))))
def jiechen():
num = str(en.get())
en.delete(0, END)
sum=1
k=abs(eval(num))
for i in range(2,k+1,1):
sum*=i
en.insert(0, str(sum))
def sqrt_():
num = str(en.get())
for i in range(len(num) - 1, 0, -1):
if (str.isdigit(num[i]) or num[i]=='.')==0:
en.delete(0, END)
en.insert(0, num[0:i+1] + str(math.sqrt(eval(num[i+1:]))))
return
en.delete(0, END)
en.insert(0, str(math.sqrt(eval(num))))
def zhi_10():
num = str(en.get())
for i in range(len(num) - 1, 0, -1):
if (str.isdigit(num[i]) or num[i]=='.')==0:
en.delete(0, END)
en.insert(0, num[0:i+1] + str(10**(eval(num[i+1:]))))
return
en.delete(0, END)
en.insert(0, str(10**(eval(num))))
def fu():
num=en.get()
en.delete(0,END)
en.insert(0,'-'+str(num))
def log_():
num = str(en.get())
for i in range(len(num) - 1, 0, -1):
if (str.isdigit(num[i]) or num[i] == '.') == 0:
en.delete(0, END)
en.insert(0, num[0:i + 1] + str(math.log10(eval(num[i + 1:]))))
return
en.delete(0, END)
if eval(num[0:])<=0:
en.insert(0,'error')
return
en.insert(0, str(math.log10(eval(num[0:]))))
def IN_():
num = str(en.get())
for i in range(len(num) - 1, 0, -1):
if (str.isdigit(num[i]) or num[i] == '.') == 0:
en.delete(0, END)
en.insert(0, num[0:i + 1] + str(math.log(eval(num[i + 1:]))))
return
en.delete(0, END)
if eval(num[0:]) <= 0:
en.insert(0, 'error')
return
en.insert(0, str(math.log(eval(num[0:]))))
结果如下:
完整代码:
from tkinter import *
from math import pi
from math import e
import math
win=Tk()
win.title('计算器')
win.geometry('450x680')
ans=0.0
flag=0
falg=0
def er_yuan():
num=str(en.get())
for i in range(0,len(num)):
if (str.isdigit(num[i]) or num[i] == '.') == 0:
number=eval(num[0:i])
print(number)
en.delete(0,END)
if num[i]=='^':
en.insert(0,str(number**(eval(num[i+1:]))))
else:
en.insert(0,str(number*(10**eval(num[i+3:]))))
return
def numinput(number):
global flag
if (flag):
en.delete(0,END)
flag=0
first_num=en.get()
en.delete(0,END)
en.insert(0,str(first_num)+str(number))
def clear():
en.delete(0,END)
def delete_n():
en.delete(len(str(en.get()))-1,END)
def x_1():
num=str(en.get())
n=1
# if(num[-1]==')'):#如果想要整体做1/x可以使用加括号的方法
# en.delete(0,END)
# en.insert(0,str(1/eval(num[1:-2])))
# return
if(num[-1]==')'):
for i in range(len(num)-2,0,-1):
if(num[i]==')'):
n+=1
elif num[i]=='(':
n-=1
if(n==0):
en.delete(0,END)
# print(num[i+1:-2])
en.insert(0,num[0:i]+str(1/eval(num[i+1:-1])))
#注意切片也是满足左开右闭的情况，只有右侧不取数字时才有
# 可以得到从对应位置到最后的结果
return
for i in range(len(num)-1,0,-1):
if (str.isdigit(num[i]) or num[i]=='.')==0:
pp=float(num[i+1:])
if pp==0:
en.delete(0,END)
en.insert('error')
print('ok')
en.delete(0,END)
en.insert(0,num[0:i+1]+str(1/pp))
return
en.delete(0,END)
en.insert(0,str(1/float(num[0:])))
def mi_2():
num=str(en.get())
for i in range(len(num)-1,0,-1):#只需要读到第二个字符即可，因为如果第二个字符都不是字符
#则即使前面是字符也是属于单目符号(这里只有 自取负符号-）对结果无关紧要
if (str.isdigit(num[i]) or num[i]=='.')==0:
en.delete(0,END)
en.insert(0,num[0:i+1]+str(eval(num[i:])*eval(num[i:])))
return
en.delete(0,END)
en.insert(0,str(eval(num)*eval(num)))
#当点了=之后如果第一个为数字则就可以重新开始若要使用之前的数据可以使用ans
# 但是如果是使用的符号则需要使用之前的数字不做修改
def add_char(x):
global falg
if (x=='exp' or x=='^'):
falg=1
num = en.get()
en.delete(0,END)
global flag
if(flag):
en.insert(0,str(ans)+x)
flag=0
else:
en.insert(0, str(num) +x)
def end1():
global ans
global flag
global falg
# for i in str(en.get()):
if falg:
er_yuan()
falg=0
return
num=eval(str(en.get()))
en.delete(0,END)
en.insert(0,str(num))
ans=num
flag=1
def ans_():
global ans
num=en.get()
en.delete(0, END)
en.insert(0, str(num)+str(ans))
def juedui():
num = str(en.get())
en.delete(0, END)
en.insert(0, str(abs(eval(num))))
def jiechen():
num = str(en.get())
en.delete(0, END)
sum=1
k=abs(eval(num))
for i in range(2,k+1,1):
sum*=i
en.insert(0, str(sum))
def sqrt_():
num = str(en.get())
for i in range(len(num) - 1, 0, -1):
if (str.isdigit(num[i]) or num[i]=='.')==0:
en.delete(0, END)
en.insert(0, num[0:i+1] + str(math.sqrt(eval(num[i+1:]))))
return
en.delete(0, END)
en.insert(0, str(math.sqrt(eval(num))))
def zhi_10():
num = str(en.get())
for i in range(len(num) - 1, 0, -1):
if (str.isdigit(num[i]) or num[i]=='.')==0:
en.delete(0, END)
en.insert(0, num[0:i+1] + str(10**(eval(num[i+1:]))))
return
en.delete(0, END)
en.insert(0, str(10**(eval(num))))
def fu():
num=en.get()
en.delete(0,END)
en.insert(0,'-'+str(num))
def log_():
num = str(en.get())
for i in range(len(num) - 1, 0, -1):
if (str.isdigit(num[i]) or num[i] == '.') == 0:
en.delete(0, END)
en.insert(0, num[0:i + 1] + str(math.log10(eval(num[i + 1:]))))
return
en.delete(0, END)
if eval(num[0:])<=0:
en.insert(0,'error')
return
en.insert(0, str(math.log10(eval(num[0:]))))
def IN_():
num = str(en.get())
for i in range(len(num) - 1, 0, -1):
if (str.isdigit(num[i]) or num[i] == '.') == 0:
en.delete(0, END)
en.insert(0, num[0:i + 1] + str(math.log(eval(num[i + 1:]))))
return
en.delete(0, END)
if eval(num[0:]) <= 0:
en.insert(0, 'error')
return
en.insert(0, str(math.log(eval(num[0:]))))
but7=Button(win,text=7,width=3,font=('Arial',31),command=lambda :numinput(7))
but8=Button(win,text=8,width=3,font=('Arial',31),command=lambda :numinput(8))
but9=Button(win,text=9,width=3,font=('Arial',31),command=lambda :numinput(9))
but4=Button(win,text=4,width=3,font=('Arial',31),command=lambda :numinput(4))
but5=Button(win,text=5,width=3,font=('Arial',31),command=lambda :numinput(5))
but6=Button(win,text=6,width=3,font=('Arial',31),command=lambda :numinput(6))
but1=Button(win,text=1,width=3,font=('Arial',31),command=lambda :numinput(1))
but2=Button(win,text=2,width=3,font=('Arial',31),command=lambda :numinput(2))
but3=Button(win,text=3,width=3,font=('Arial',31),command=lambda :numinput(3))
but0=Button(win,text=0,width=3,font=('Arial',31),command=lambda :numinput(0))
bu1=Button(win,text='ans',width=3,font=('Arial',31),command=ans_)
bu2=Button(win,text='π',width=3,font=('Arial',31),command=lambda :numinput(pi))
bu3=Button(win,text='e',width=3,font=('Arial',31),command=lambda :numinput(e))
bu4=Button(win,text='CE',width=3,font=('Arial',31),command=clear)
bu5=Button(win,text='del',width=3,font=('Arial',31),command=delete_n)
bu6=Button(win,text='x^2',width=3,font=('Arial',31),command=mi_2)
bu7=Button(win,text='1/x',width=3,font=('Arial',31),command=x_1)
bu8=Button(win,text='|x|',width=3,font=('Arial',31),command=juedui)
bu9=Button(win,text='exp',width=3,font=('Arial',31),command=lambda :add_char('exp'))
bu0=Button(win,text='mod',width=3,font=('Arial',31),command=lambda:add_char('%'))
b1=Button(win,text='sqrt()',width=3,font=('Arial',31),command=sqrt_)
b2=Button(win,text='(',width=3,font=('Arial',31),command=lambda :add_char('('))
b3=Button(win,text=')',width=3,font=('Arial',31),command=lambda :add_char(')'))
b4=Button(win,text='n!',width=3,font=('Arial',31),command=jiechen)
b5=Button(win,text='/',width=3,font=('Arial',31),command=lambda :add_char('/'))
b6=Button(win,text='x^y',width=3,font=('Arial',31),command=lambda :add_char('^'))
b7=Button(win,text='*',width=3,font=('Arial',31),command=lambda :add_char('*'))
b8=Button(win,text='10^x',width=3,font=('Arial',31),command=zhi_10)
b9=Button(win,text='-',width=3,font=('Arial',31),command=lambda :add_char('-'))
b0=Button(win,text='log',width=3,font=('Arial',31),command=log_)
b11=Button(win,text='+',width=3,font=('Arial',31),command=lambda :add_char('+'))
b12=Button(win,text='ln',width=3,font=('Arial',31),command=IN_)
b13=Button(win,text='+/-',width=3,font=('Arial',31),command=fu)
b14=Button(win,text='.',width=3,font=('Arial',31),command=lambda :add_char('.'))
b15=Button(win,text='=',width=3,font=('Arial',31),command=end1)
b6.place(x=0,y=320)
but7.place(x=90,y=320)
but8.place(x=180,y=320)
but9.place(x=270,y=320)
b7.place(x=360,y=320)
but4.place(x=90,y=410)
but5.place(x=180,y=410)
but6.place(x=270,y=410)
b8.place(x=0,y=410)
b9.place(x=360,y=410)
but1.place(x=90,y=500)
but2.place(x=180,y=500)
but3.place(x=270,y=500)
b0.place(x=0,y=500)
b11.place(x=360,y=500)
b13.place(x=90,y=590)
but0.place(x=180,y=590)
b14.place(x=270,y=590)
b12.place(x=0,y=590)
b15.place(x=360,y=590)
bu2.place(x=90,y=50)
bu3.place(x=180,y=50)
bu4.place(x=270,y=50)
bu1.place(x=0,y=50)
bu5.place(x=360,y=50)
bu7.place(x=90,y=140)
bu8.place(x=180,y=140)
bu9.place(x=270,y=140)
bu6.place(x=0,y=140)
bu0.place(x=360,y=140)
b2.place(x=90,y=230)
b3.place(x=180,y=230)
b4.place(x=270,y=230)
b1.place(x=0,y=230)
b5.place(x=360,y=230)
en=Entry(win,width=30,font=('Arial',20))
en.place(x=0,y=0)
mainloop()