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实验4 函数与异常处理应用编程

 

 1 #task1.py
 2 print(sum)
 3 sum = 42
 4 print(sum)
 5 def inc(n):
 6     sum = n+1
 7     print(sum)
 8     return sum
 9 sum = inc(7) + inc(7)
10 print(sum)

1.Built-in

2.Global

3.Local

4.Global 

1 #task2_2.py
2 list1 = [1, 9, 8, 4]
3 print( sorted(list1) )
4 print( sorted(list1, reverse=True) )
5 print( sorted(list1, True) )

python内置函数sorted()中,参数reverse的传递方式必须使用关键字传递
1 #task2_3.py
2 def func(a, b, c, /, *, d, e, f):
3     return( [a,b,c,d,e,f] )
4 print(func(1,2,3,d=4,e=5,f=6))

 1 #task3.py
 2 def solve(a, b, c):
 3     '''
 4     求解一元二次方程, 返回方程的两个根
 5     :para: a,b,c: int 方程系数
 6     :return: tuple
 7     '''
 8     delta = b*b - 4*a*c
 9     delta_sqrt = abs(delta)**0.5
10     p1 = -b/2/a;
11     p2 = delta_sqrt/2/a
12     if delta>=0:
13         root1 = p1 + p2
14         root2 = p1 - p2
15     else:
16         root1 = complex(p1, p2)
17         root2 = complex(p1, -p2)
18     return root1, root2
19 
20 
21 while True:
22     try:
23        a,b,c = eval(input('Enter eqution coefficient: '))
24        if a == 0:
25            raise
26     except:
27         print('invalid input, or, a is zero')
28         break
29     else:
30         root1, root2 = solve(a, b, c)
31         print(f'root1 = {root1:.2f}, root2 = {root2:.2f}')
32         print()

加一行代码会把说明信息打印出来

 1 #task4.py
 2 def list_generator(a,b,step=1):
 3     list=[]
 4     while a<=b:
 5         list.append(a)
 6         a+=step
 7     return list
 8 list1 = list_generator(-5, 5)
 9 print(list1)
10 list2 = list_generator(-5, 5, 2)
11 print(list2)
12 list3 = list_generator(1, 5, 0.5)
13 print(list3)

 1 #task5.py
 2 def is_prime(n):
 3     for i in range(2,int(n**0.5)+1):
 4         if n%i==0:
 5             return False
 6     else:
 7         return True
 8 for j in range(2,21,2):
 9     for k in range(2,j):
10         if is_prime(j-k):
11             print(f'{j}={k}+{j-k}')
12             break

 

 1 #task6.py
 2 def encoder(text:str):
 3     ans=[]
 4     for n in text:
 5         x=ord(n)
 6         if 65<=x<=90:
 7             ans.append(chr((x-60)%26+65))
 8         elif 97<=x<=122:
 9             ans.append(chr((x-92)%26+97))
10         else:
11             ans.append(n)
12     return ''.join(ans)
13 
14 def decoder(text1):
15     ans1=[]
16     for n in text1:
17         x1=ord(n)
18         if 65 <= x1 <= 90:
19             ans1.append(chr((x1 - 44) % 26 + 65))
20         elif 97 <= x1 <= 122:
21             ans1.append(chr((x1 - 76) % 26 + 97))
22         else:
23             ans1.append(n)
24     return ''.join(ans1)
25 
26 
27 
28 text=input('输入英文文本:')
29 text1=encoder(text)
30 print(f'编码后的文本:{text1}')
31 print(f'解码后的文本:{decoder(text1)}')

 

 1 #task7.py
 2 def collatz(n):
 3     if n%2==0:
 4         return n/2
 5     else:
 6         return 3*n+1
 7 try:
 8     n=eval(input('Enter a positive integer:'))
 9     if type(n)!=int or n<=0:
10         raise ValueError and NameError
11 except ValueError and NameError:
12     print('Error: must be a positive integer')
13 else:
14     list=[n]
15     while n!=1:
16         n=collatz(n)
17         list.append(n)
18     print(list)

 

posted on 2022-05-05 11:37  靠谱一星  阅读(18)  评论(3编辑  收藏  举报