代码，python1

 def main():
     try:
         number1,number2=eval(input("please enter two number"))
         result=number1/number2
     except ZeroDivisionError:
         print("the division is 0",result)
     except SyntaxError:
         print("syntax is wrong")
     else:
         print("ok the result is ",result)
     finally:
                              print("i don't know")
 main()

 Python 3.6.1rc1 (v3.6.1rc1^0:e0fbe5feee4f9c00f09eb9659c2182183036261a, Mar  4 2017, 20:00:12) [MSC v.1900 64 bit (AMD64)] on win32
 Type "copyright", "credits" or "license()" for more information.
 >>>
 = RESTART: C:/Users/lenovo/AppData/Local/Programs/Python/Python36/pytho2.py =
 please enter two number1 3
 syntax is wrong
 i don't know
 >>> main()
 please enter two number1,2
 ok the result is  0.5
 i don't know
 >>> main()
 please enter two number
 syntax is wrong
 i don't know
 >>> main()
 please enter two number1,0
 i don't know
 Traceback (most recent call last):
   File "C:/Users/lenovo/AppData/Local/Programs/Python/Python36/pytho2.py", line 4, in main
     result=number1/number2
 ZeroDivisionError: division by zero

 During handling of the above exception, another exception occurred:

 Traceback (most recent call last):
   File "<pyshell#3>", line 1, in <module>
     main()
   File "C:/Users/lenovo/AppData/Local/Programs/Python/Python36/pytho2.py", line 6, in main
     print("the division is 0",result)
 UnboundLocalError: local variable 'result' referenced before assignment
 >>> main()
 please enter two number1.1,0.0
 i don't know
 Traceback (most recent call last):
   File "C:/Users/lenovo/AppData/Local/Programs/Python/Python36/pytho2.py", line 4, in main
     result=number1/number2
 ZeroDivisionError: float division by zero

 During handling of the above exception, another exception occurred:

 Traceback (most recent call last):
   File "<pyshell#4>", line 1, in <module>
     main()
   File "C:/Users/lenovo/AppData/Local/Programs/Python/Python36/pytho2.py", line 6, in main
     print("the division is 0",result)
 UnboundLocalError: local variable 'result' referenced before assignment
 >>>
 = RESTART: C:/Users/lenovo/AppData/Local/Programs/Python/Python36/pytho2.py =
 please enter two number
 1,1
 ok the result is  1.0
 i don't know
 >>> python2.py
 Traceback (most recent call last):
   File "<pyshell#5>", line 1, in <module>
     python2.py
 NameError: name 'python2' is not defined
 >>> pytho2.py
 Traceback (most recent call last):
   File "<pyshell#6>", line 1, in <module>
     pytho2.py
 NameError: name 'pytho2' is not defined
 >>> main
 <function main at 0x0000013B8E633E18>
 >>> main()
 please enter two number
 1.1,0.0
 i don't know
 Traceback (most recent call last):
   File "C:/Users/lenovo/AppData/Local/Programs/Python/Python36/pytho2.py", line 4, in main
     result=number1/number2
 ZeroDivisionError: float division by zero

 During handling of the above exception, another exception occurred:

 Traceback (most recent call last):
   File "<pyshell#8>", line 1, in <module>
     main()
   File "C:/Users/lenovo/AppData/Local/Programs/Python/Python36/pytho2.py", line 6, in main
     print("the division is 0")
 UnboundLocalError: local variable 'result' referenced before assignment
 >>>
 = RESTART: C:/Users/lenovo/AppData/Local/Programs/Python/Python36/pytho2.py =
 please enter two number
 1,0
 the division is 0
 i don't know
 >>> 

2.

 def root():
     try:
         print("please enter threes numbers:\n")
         a,b,c=input("yes please such as(z,x,y)")
         discRoot=math.sqrt(b*b-4*a*c)
         root1=(-b+discRoot)/(2*a)
         root2=(-b-discRoot)/(2*a)
         print("the root is",root1,root2)
     except ValueError:
         print("\n no really root)
 root()

冒号忘了，还有：eval()

修后如下：

 import math
 def main1():
     try:
         number1,number2=eval(input("please enter two number\n"))
         result=number1/number2
     #except ZeroDivisionError:
      #   print("the division is 0")
     except ZeroDivisionError:
         print("the division is 0")
     except SyntaxError:
         print("syntax is wrong")
     else:
         print("ok the result is ",result)
     finally:
                              print("i don't know")

 def root():
     try:
         print("please enter threes numbers:\n")
         a,b,c=eval(input("yes please such as(z,x,y):"))
         print("www")
         discRoot=math.sqrt(b * b - 4 * a * c)
         print("hey here")
         root1=(-b+discRoot)/(2*a)
         root2=(-b-discRoot)/(2*a)
         print("the root is",root1,root2)
     except ValueError:
         print("\n no really root")
 root()