1 def main():
2 try:
3 number1,number2=eval(input("please enter two number"))
4 result=number1/number2
5 except ZeroDivisionError:
6 print("the division is 0",result)
7 except SyntaxError:
8 print("syntax is wrong")
9 else:
10 print("ok the result is ",result)
11 finally:
12 print("i don't know")
13 main()
1 Python 3.6.1rc1 (v3.6.1rc1^0:e0fbe5feee4f9c00f09eb9659c2182183036261a, Mar 4 2017, 20:00:12) [MSC v.1900 64 bit (AMD64)] on win32
2 Type "copyright", "credits" or "license()" for more information.
3 >>>
4 = RESTART: C:/Users/lenovo/AppData/Local/Programs/Python/Python36/pytho2.py =
5 please enter two number1 3
6 syntax is wrong
7 i don't know
8 >>> main()
9 please enter two number1,2
10 ok the result is 0.5
11 i don't know
12 >>> main()
13 please enter two number
14 syntax is wrong
15 i don't know
16 >>> main()
17 please enter two number1,0
18 i don't know
19 Traceback (most recent call last):
20 File "C:/Users/lenovo/AppData/Local/Programs/Python/Python36/pytho2.py", line 4, in main
21 result=number1/number2
22 ZeroDivisionError: division by zero
23
24 During handling of the above exception, another exception occurred:
25
26 Traceback (most recent call last):
27 File "<pyshell#3>", line 1, in <module>
28 main()
29 File "C:/Users/lenovo/AppData/Local/Programs/Python/Python36/pytho2.py", line 6, in main
30 print("the division is 0",result)
31 UnboundLocalError: local variable 'result' referenced before assignment
32 >>> main()
33 please enter two number1.1,0.0
34 i don't know
35 Traceback (most recent call last):
36 File "C:/Users/lenovo/AppData/Local/Programs/Python/Python36/pytho2.py", line 4, in main
37 result=number1/number2
38 ZeroDivisionError: float division by zero
39
40 During handling of the above exception, another exception occurred:
41
42 Traceback (most recent call last):
43 File "<pyshell#4>", line 1, in <module>
44 main()
45 File "C:/Users/lenovo/AppData/Local/Programs/Python/Python36/pytho2.py", line 6, in main
46 print("the division is 0",result)
47 UnboundLocalError: local variable 'result' referenced before assignment
48 >>>
49 = RESTART: C:/Users/lenovo/AppData/Local/Programs/Python/Python36/pytho2.py =
50 please enter two number
51 1,1
52 ok the result is 1.0
53 i don't know
54 >>> python2.py
55 Traceback (most recent call last):
56 File "<pyshell#5>", line 1, in <module>
57 python2.py
58 NameError: name 'python2' is not defined
59 >>> pytho2.py
60 Traceback (most recent call last):
61 File "<pyshell#6>", line 1, in <module>
62 pytho2.py
63 NameError: name 'pytho2' is not defined
64 >>> main
65 <function main at 0x0000013B8E633E18>
66 >>> main()
67 please enter two number
68 1.1,0.0
69 i don't know
70 Traceback (most recent call last):
71 File "C:/Users/lenovo/AppData/Local/Programs/Python/Python36/pytho2.py", line 4, in main
72 result=number1/number2
73 ZeroDivisionError: float division by zero
74
75 During handling of the above exception, another exception occurred:
76
77 Traceback (most recent call last):
78 File "<pyshell#8>", line 1, in <module>
79 main()
80 File "C:/Users/lenovo/AppData/Local/Programs/Python/Python36/pytho2.py", line 6, in main
81 print("the division is 0")
82 UnboundLocalError: local variable 'result' referenced before assignment
83 >>>
84 = RESTART: C:/Users/lenovo/AppData/Local/Programs/Python/Python36/pytho2.py =
85 please enter two number
86 1,0
87 the division is 0
88 i don't know
89 >>>
2.
1 def root():
2 try:
3 print("please enter threes numbers:
")
4 a,b,c=input("yes please such as(z,x,y)")
5 discRoot=math.sqrt(b*b-4*a*c)
6 root1=(-b+discRoot)/(2*a)
7 root2=(-b-discRoot)/(2*a)
8 print("the root is",root1,root2)
9 except ValueError:
10 print("
no really root)
11 root()
冒号忘了，还有：eval()
修后如下：
1 import math
2 def main1():
3 try:
4 number1,number2=eval(input("please enter two number
"))
5 result=number1/number2
6 #except ZeroDivisionError:
7 # print("the division is 0")
8 except ZeroDivisionError:
9 print("the division is 0")
10 except SyntaxError:
11 print("syntax is wrong")
12 else:
13 print("ok the result is ",result)
14 finally:
15 print("i don't know")
16
17 def root():
18 try:
19 print("please enter threes numbers:
")
20 a,b,c=eval(input("yes please such as(z,x,y):"))
21 print("www")
22 discRoot=math.sqrt(b * b - 4 * a * c)
23 print("hey here")
24 root1=(-b+discRoot)/(2*a)
25 root2=(-b-discRoot)/(2*a)
26 print("the root is",root1,root2)
27 except ValueError:
28 print("
no really root")
29 root()
30