a = [1,2,3,4,5] b = a[1:] b.append(a[0]) print(b)

The output of this code is:

[2, 3, 4, 5, 1]

Explanation:

- We start by defining a list `a` with the values `[1,2,3,4,5]`.
- We then create a new list `b` by slicing `a` from index 1 to the end (`a[1:]`). This means that `b` contains all the elements of `a` starting from the second one (`2,3,4,5`).
- We then use the `append()` method to add the first element of `a` (`1`) to the end of `b`.
- Finally, we print the resulting list `b`, which is `[2, 3, 4, 5, 1]`.

相关问题

约瑟夫环改错class Node: def __init__(self,data): self.data=data self.next=Noneclass linklist: def __init__(self): self.head=None self.data=None def isEmpty(self): if self.head: return False else: return True def length(self): if self.isEmpty(): return 0 else: t = self.head n = 1 while t.next: if t.next == self.head: break t = t.next n = n + 1 return n def addhead(self,data): node = Node(data) if self.isEmpty(): self.head = node self.tail = self.head else: node.next = self.head self.head = node self.tail.next = self.head def addtail(self,data): node=Node(data) if self.isEmpty(): self.addhead(data) else: t=self.head n=1 l=self.length() while n<l: n=n+1 t=t.next t.next=node node.next=self.head self.tail=node def delete(self,index): if self.isEmpty(): print("The linked list is empty") else: t = self.head l = self.length() if index == 0: self.head = t.next self.tail.next = self.head elif index == l - 1: n = 1 while n < l - 1: t = t.next n = n + 1 t.next = self.head self.tail = t elif index > l - 1: print("Out of range") elif index < 0: print("Wrong operation") else: n = 1 while n < index - 1: t = t.next n = n + 1 a = t.next.next t.next = a def insert(self,data,index): l = self.length() if index == 0 or self.isEmpty(): self.addhead(data) elif index >= l: self.addtail(data) else: node = Node(data) t = self.head n = 1 while n < index - 1: t = t.next n = n + 1 a = t.next t.next = node node.next = a def search(self,a): t=self.head for i in range(a): t=t.next return t.data def form(self,datalist): self.addhead(datalist[0]) for i in range(1,len(datalist)): self.addtail(datalist[i]) t = self.head while t.next != self.head: t = t.nextn,p=map(int,input().split(' '))data=[]p=p-1for i in range(1,n+1): data.append(i)print(data)datalist=[]for i in range(len(data)): datalist.append(int(data[i]))link=linklist()link.form(datalist)a=pb=[]while link.length()>0: b.append(link.search(a)) link.delete(a) a=a+p while a>=link.length(): a=a-link.length()print(b)

改错如下：

class Node:
    def __init__(self, data):
        self.data = data
        self.next = None

class LinkList:
    def __init__(self):
        self.head = None
        self.tail = None
    
    def isEmpty(self):
        if self.head:
            return False
        else:
            return True
    
    def length(self):
        if self.isEmpty():
            return 0
        else:
            t = self.head
            n = 1
            while t.next:
                if t.next == self.head:
                    break
                t = t.next
                n += 1
            return n
    
    def addhead(self, data):
        node = Node(data)
        if self.isEmpty():
            self.head = node
            self.tail = self.head
        else:
            node.next = self.head
            self.head = node
            self.tail.next = self.head
    
    def addtail(self, data):
        node = Node(data)
        if self.isEmpty():
            self.addhead(data)
        else:
            t = self.head
            n = 1
            l = self.length()
            while n < l:
                n += 1
                t = t.next
            t.next = node
            node.next = self.head
            self.tail = node
    
    def delete(self, index):
        if self.isEmpty():
            print("The linked list is empty")
        else:
            t = self.head
            l = self.length()
            if index == 0:
                self.head = t.next
                self.tail.next = self.head
            elif index == l - 1:
                n = 1
                while n < l - 1:
                    t = t.next
                    n += 1
                t.next = self.head
                self.tail = t
            elif index > l - 1:
                print("Out of range")
            elif index < 0:
                print("Wrong operation")
            else:
                n = 1
                while n < index:
                    t = t.next
                    n += 1
                a = t.next.next
                t.next = a
    
    def insert(self, data, index):
        l = self.length()
        if index == 0 or self.isEmpty():
            self.addhead(data)
        elif index >= l:
            self.addtail(data)
        else:
            node = Node(data)
            t = self.head
            n = 1
            while n < index:
                t = t.next
                n += 1
            a = t.next
            t.next = node
            node.next = a
    
    def search(self, a):
        t = self.head
        for i in range(a):
            t = t.next
        return t.data
    
    def form(self, datalist):
        self.addhead(datalist[0])
        for i in range(1, len(datalist)):
            self.addtail(datalist[i])
        t = self.head
        while t.next != self.head:
            t = t.next

n, p = map(int, input().split(' '))
data = [i for i in range(1, n+1)]
print(data)

datalist = []
for i in range(len(data)):
    datalist.append(data[i])

link = LinkList()
link.form(datalist)

a = p-1
b = []
while link.length() > 0:
    b.append(link.search(a))
    link.delete(a)
    a += p-1
    while a >= link.length():
        a -= link.length()

print(b)

class TripleNode(object): def __init__(self, row=0, column=0, value=0): self.row = row self.column = column self.value = value def add_sparse_matrix(self, A, B): C = [] i = j = 0 while i < len(A) and j < len(B): if A[i].row < B[j].row: C.append(A[i]) i += 1 elif A[i].row > B[j].row: C.append(B[j]) j += 1 else: if A[i].column < B[j].column: C.append(A[i]) i += 1 elif A[i].column > B[j].column: C.append(B[j]) j += 1 else: C.append(TripleNode(A[i].row, A[i].column, A[i].value + B[j].value)) i += 1 while i < len(A): C.append(A[i]) i += 1 while j < len(B): C.append(B[j]) j += 1 return C A = [TripleNode(0, 0, 1), TripleNode(1, 1, 2)] B = [TripleNode(0, 0, 3), TripleNode(1, 1, 4)] C = add_sparse_matrix(A, B) print(C)

这段代码实现了稀疏矩阵的加法操作。其中TripleNode类表示一个三元组，分别存储稀疏矩阵的行、列和元素值。add_sparse_matrix函数接受两个稀疏矩阵A和B作为参数，返回它们的和矩阵C，C也是一个稀疏矩阵。

函数实现的思路是将A和B中的元素逐个进行比较，按照行和列的大小关系将它们合并到C中。如果A和B中有相同的行和列，则将它们对应的元素值相加。最后，将A和B中剩余的元素依次添加到C中。

在代码的末尾，我们创建了两个稀疏矩阵A和B，并将它们传递给add_sparse_matrix函数，输出其结果C。