Question

使用Python编程

Answer 1

#录入格式为 数字+空格+符号+空格+数字
#只能录入数字
#分母不能为0
#符号只能是+-%*/

def func():
	Number=input('')
	NB=Number.split(' ')
	if len(NB)==3:
		try:
			int(NB[0])
			int(NB[2])
			if NB[1]=='+':
				print(int(NB[0])+int(NB[2]))
			elif NB[1]=='-':
				print(int(NB[0])-int(NB[2]))
			elif NB[1]=='*':
				print(int(NB[0])*int(NB[2]))
			elif NB[1]=='/':
				if NB[2]=='0':
					print('ERROR')
				else:
					print(int(NB[0])/int(NB[2]))
			elif NB[1]=='%':
				if NB[2]=='0':
					print('ERROR')
				else:
					print(int(NB[0])%int(NB[2]))
			else:
				print('ERROR')
		except:
			print('ERROR')
	elif Number=='excit':
		quit()
	else:
		print('ERROR')

while True:
	func()

Answer 2

symbol = {'+', '-', '*', '/', '%'}
s = input('请输入算式：')

if len(symbol - set(s)) < 5:
    try:
        print("{0} = {1}".format(s, eval(s)))
    except ZeroDivisionError:
        print('除数不能为 0 ')
    except:
        print('error')
else:
    print('error')