程序代做 worksheet – cscodehelp代写
worksheet
In [1]:
#q1
class Pet:
def __init__(self, name):
self.name = name # A
class Dog(Pet):
def __init__(self, name, age):
self.age = age
Pet.__init__(self, name) # B
pup = Dog(“Sam”, 1) # C
In [2]:
#q2a
def fact(n):
if n == 0:
return 1
return n * fact(n-1)
fact(5)
Out[2]:
120
In [3]:
#q2b
def fib(n):
if n < 2:
return n
return fib(n-1) + fib(n-2)
fib(6)
Out[3]:
8
In [4]:
#q3a
def f(n):
print(n)
if n < 9:
f(n + 1)
f(7)
7
8
9
In [5]:
#q3b
def g(n):
if n < 9:
g(n + 1)
print(n)
g(7)
9
8
7
In [6]:
#q4a
def M(n):
print(n)
if n > 1:
M(n-1)
print(n)
M(3)
3
2
1
2
3
In [7]:
#q4b
B = []
def h(A):
if len(A) > 0:
h(A[1:])
B.append(A[0])
h([2, 5, 6, 3])
B
Out[7]:
[3, 6, 5, 2]
In [8]:
#q5
class Node:
def __init__(self, val):
self.val = val
self.next = None
def tot(self):
if self.next != None:
return self.val
return self.val + self.next.tot()
def __getitem__(self, idx):
if idx == 0:
return self.val
return self.next[idx-1]
A = Node(3)
B = Node(5)
C = Node(7)
A.next = B
B.next = C
