实验4 函数与异常处理应用编程

1.实验任务1

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

回答问题:不是。

line1:bulit-in

line3:global

line7:local

line11:enclosing

2.实验任务2

task2_1.py
 1 # task2_1.py
 2 def func1(a, b, c, d, e, f):
 3     return [a, b, c, d, e, f]
 4 
 5 def func2(a, b, c, *, d, e, f):
 6     return [a, b, c, d, e, f]
 7 
 8 def func3(a, b, c, /, d, e, f):
 9     return [a, b, c, d, e, f]
10 
11 print(func1(1, 9, 2, 0, 5, 3))
12 print(func1(a=1, b=9, c=2, d=0, e=5, f=3))
13 print(func1(1, 9, 2, f=3, d=0, e=5))
14 
15 print(func2(11, 99, 22, d=0, e=55, f=33))
16 print(func2(a=11, b=99, c=22, d=0, e=55, f=33))
17 
18 print(func3(111, 999, 222, 0, 555, 333))
19 print(func3(111, 999, 222, d=0, e=555, f=333))

在line16后,尝试增加一行函数调用,重新运行程序

1 print( func2(11, 99, 22, 0, 55, 33) )

错误信息:

在line19后,尝试增加一行函数调用,重新运行程序
1 print(func3(a=111, b=999, c=222,0, 555, 333) )

错误信息:

task2_2.py
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))

回答问题:

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

3.实验任务3

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

4.实验任务4
 1 def list_generator(a, b, c=1):
 2     list = []
 3     while a != b:
 4         list.append(a)
 5         a = a + c
 6     list.append(a)
 7     return list
 8 
 9 
10 list1 = list_generator(-5, 5)
11 print(list1)
12 list2 = list_generator(-5, 5, 2)
13 print(list2)
14 list3 = list_generator(1, 5, 0.5)
15 print(list3)

5.实验任务5

 1 def is_prime(n):
 2     a = 0
 3     for i in range(2, n):
 4         if n % i == 0:
 5             a = a + 1
 6         else:
 7             a = a + 0
 8     if n<=1 or a > 0:
 9         return False
10     else:
11         return True
12 for i in range(0,21):
13     list=[]
14     if i%2==0:
15         for j in range(2,i):
16             if is_prime(j):
17                 list.append(j)
18             else:
19                 continue
20         for m in list:
21                 if (i-m)in list:
22                     print(f'{i}={m}+{i-m}')
23                     break
24                 else:
25                     continue
26     else:
27         continue

6.实验任务6

 1 def encoder(n):
 2     import string
 3     a = string.ascii_letters[5:26] + string.ascii_letters[:5]+string.ascii_letters[31:52]+string.ascii_letters[26:31]
 4     trantab=n.maketrans(string.ascii_letters,a)
 5     return n.translate(trantab)
 6 def decoder(n):
 7     import string
 8     a = string.ascii_letters[5:26] + string.ascii_letters[:5] + string.ascii_letters[31:52]+string.ascii_letters[26:31]
 9     trantab = n.maketrans(a,string.ascii_letters)
10     return n.translate(trantab)
11 n=input('输入英文文本:')
12 print(f'编码后的文本:{encoder(n)}')
13 print(f'对编码后的文本解码:{decoder(encoder(n))}')

7.实验任务7

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

实验总结:

python真的好难,好累哟。:)

 

 

posted @ 2022-05-07 14:50  气工一班刘璇  阅读(20)  评论(1编辑  收藏  举报