Question

我是编程新手，开始使用Python。我正在尝试用5个操作（到目前为止我只做3个）做一个简单的计算器，可以执行PEMDAS。我的代码的问题是它以前可以工作，但是当我不断添加行时，在插入条目时出现错误。

这是部分代码：

from Tkinter import *

main=Tk()
main.title("PEMDAS Calculator")

Grid.rowconfigure(main, 0, weight=1)
Grid.columnconfigure(main, 0, weight=1)

entry= Entry(main, width=50, bg='#DFDEDB')
label=Label(main)
frame= Frame(main)
secondFrame= Frame(main)
thirdFrame= Frame(main)
fourthFrame= Frame(main)
fifthFrame= Frame(main)

label.grid(row=1)
entry.grid(row=2, column=0)
frame.grid(row=4, column=0)
secondFrame.grid(row=5, column=0)
thirdFrame.grid(row=6, column=0)
fourthFrame.grid(row=7, column=0)
fifthFrame.grid(row=8, column=0)

#Label
intro=Label(label, text="Welcome to Calculator!")
intro.grid(row=0)

def buttons(number):
	prior= entry.get()
	entry.delete(0,END)
	entry.insert(0, str(prior)+str(number))

def addition():
	buttons('+')

def multiplication():
	buttons('*')

def subtraction():
	buttons('-')

def division():
	buttons('/')

def equal():
	eq=entry.get()
	entry.delete(0,END)
	
	if '+' and '*' in eq:
		def MA():
			while '+' in eq:
				addEl=eq.split('+')
				toMultiply=[]
				numbers=[]
				for num in addEl:
					if '*' in num:
						mulEl=num.split("*")
						for element in mulEl:
							toMultiply.append(element)
					else:
						numbers.append(int(num))
				def multiply():
					prod = 1
					for element in toMultiply:
						total = prod * int(element)
						prod = total
					return prod
				numbers.append(multiply())
				return sum(numbers)
		entry.insert(0, MA())

	elif '+' and '-' in eq:
		el = eq.split('+')
		numbers=[]
		def addsub():
			for num in el:
				if '-' in num:
					def sub():
						subEl=num.split('-')
						dif = 0
						subEl[0] = -(int(subEl[0]))
						for dig in subEl:
							dif -= int(dig)
						return dif
					numbers.append(sub())
				else:
					numbers.append(int(num))
			return sum(numbers)
		entry.insert(0, addsub())

	elif '+' in eq:
		el=eq.split('+')
		def add():
			total=[]
			for num in el:
				total.append(int(num))
			return total
		entry.insert(0, sum(add()))
	elif '*' in eq:
		def multi():
			el = eq.split('*')
			prod = 1
			for num in el:
				total=prod*int(num)
				prod=total
			return prod
		entry.insert(0, multi())
	elif '-' in eq:
		el=eq.split('-')
		def subtract():
			dif=0
			el[0] = -(int(el[0]))
			for num in el:
					dif -= int(num)
			return dif
		entry.insert(0, subtract())

	



one=Button(frame, text=1, padx=20, pady=20, command=lambda: buttons(1))
two=Button(frame, text=2, padx=20, pady=20, command=lambda: buttons(2))
three=Button(frame, text=3, padx=20, pady=20, command=lambda: buttons(3))
space=Label(frame, text="              ")
add=Button(frame,  padx=20, pady=20, text="+", command=addition)
subtract=Button(frame,  padx=20, pady=20, text="-",  command=subtraction)

one.grid(row=4, column=0)
two.grid(row=4, column=1)
three.grid(row=4, column=2)
space.grid(row=4, column=3)
add.grid(row=4, column=4)
subtract.grid(row=4, column=5)

four=Button(secondFrame, text=4,  padx=20, pady=20, command=lambda: buttons(4))
five=Button(secondFrame, text=5, padx=20, pady=20, command=lambda: buttons(5))
six=Button(secondFrame, text=6, padx=20, pady=20, command=lambda: buttons(6))
space=Label(secondFrame, text="              ")
multiply=Button(secondFrame, text="*", padx=21.5, pady=20, command=multiplication)
divide=Button(secondFrame, text="/", padx=19, pady=20,  command=division)

four.grid(row=5, column=0)
five.grid(row=5, column=1)
six.grid(row=5, column=2)
space.grid(row=5, column=3)
multiply.grid(row=5, column=4)
divide.grid(row=5, column=5)
	
seven=Button(thirdFrame, text=7, padx=20, pady=20, command=lambda: buttons(7))
eight=Button(thirdFrame, text=8, padx=20, pady=20, command=lambda: buttons(8))
nine=Button(thirdFrame, text=9, padx=20, pady=20, command=lambda: buttons(9))
space=Label(thirdFrame, text="              ")
sqrt=Button(thirdFrame, text="sqrt", padx=41, pady=20, command=lambda: buttons('sqrt'))

	
seven.grid(row=6, column=0)
eight.grid(row=6, column=1)
nine.grid(row=6, column=2)
space.grid(row=6, column=3)
sqrt.grid(row=6, column=4)


space1=Label(fourthFrame, text="            ")
zero=Button(fourthFrame, text=0, padx=20, pady=20, command=lambda: buttons(0))
space=Label(fourthFrame, text="                            ")
eq=Button(fourthFrame, text="=",  padx=47, pady=20, command=equal)

space1.grid(row=7,column=0)
zero.grid(row=7, column=1)
space.grid(row=7, column=3)
eq.grid(row=7, column=5)


main.mainloop()

Answer 1

如果MA()返回None，则会出现此错误。您无法将python值None插入条目小部件。

计算器给出TclError：错误的＃参数：应为“ .139833730011008插入索引文本”

1 个答案: