python异常处理

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s=input("enter an integer:")try:    i=int(s)    print("valid integer entered:",i)except ValueError as err:        print(err)

while True:    try:        x=int(input("Please enter a number:"))        break    except  ValueError:        print("no valid number,try again")

import mathdef main():    print("This program finds the real solution to a quadratic.\n")    try:        a,b,c=eval(input("please enter the coefficients(a,b,c):"))        discRoot=math.sqrt(b*b-4*a*c)        root1=(-b+discRoot)/(2*a)        root2=(-b-discRoot)/(2*a)        print("\nthe solution are:",root1,root2)    except ValueError as excobj:        print(excobj)        if str(excobj)=="math domain error":            print("no real roots")        else:            print("you didn't give me the right numbers")    except NameError:        print("\n you didn't enter the three numbers")    except TypeError:        print("your inputs were not all numbers")    except SyntaxError:        print("you input was not in the correct form")    except:        print("something was wrong")main()

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