items=s.split() matrix=[]foriinrange(3): lst= [eval(items[j])forjinrange(i * 3, i * 3 +3)] matrix.append(lst)returnmatrix#矩阵相乘defmatrixMultiply(m1, m2):#定义乘法后的结果矩阵result =[]###由于以后要访问其中元素,所以先初始化m*n 矩阵乘以n*p矩阵是m*p矩阵,#所以result的行是m1...
Return the index in the list of the first item whose value isx. It is an error if there is no such item. list.count(x) Return the number of timesxappears in the list. list.sort() Sort the items of the list, in place. list.reverse() Reverse the elements of the list, in place...
Python 内置函数 len() 能够返回字符串、列表和元组中的成员数量,且在第4章4.2.3节阅读过它的帮助文档,其中明确指出:“Return the number of items in a container”。字典是 “container”,所以可以作为 len() 的参数,并返回字典中的成员数量,即键值对的数量。 字典中键值对的数量,通俗地说,就是“字典的长...
importasyncioimportaiohttpasyncdeffetch_data(url):asyncwithaiohttp.ClientSession()assession:asyncwithsession.get(url)asresponse:data=awaitresponse.text()# 异步等待API返回数据print(f"收到数据: {data[:100]}")# 只打印前100个字符returndataasyncdefmain():urls=["https://api.example.com/data1","htt...
list.count(x)Return the number of times x appears in the list.返回x在列表中出现的次数。list.sort(key=None, reverse=False)Sort the items of the list in place (the arguments can be used for sort customization, see sorted() for their explanation).对列表中的项目进行排序 (参数可用于排序自...
编写一个Python函数,接收一个整数列表作为参数,返回列表中所有偶数的平均值。```pythondef average_even(numbers):evens = [x for x in numbers if x % 2 == 0]if len(evens) == 0:return 0return sum(evens) / len(evens)numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]print(a
And they’re typically used to store homogeneous items. 列表是序列的一种类型,就像字符串一样,但它们确实有区别。 Lists are one type of sequence, just like strings but they do have their differences. 如果我们比较字符串和列表,一个区别是字符串是单个字符的序列, If we compare a string and a li...
class Restaurant(): def __init__(self, restaurant_name, cuisine_type): self.restaurant_name = restaurant_name self.cuisine_type = cuisine_type self.number_served = 0 def read_number_served(self): print("The number of people who have dined in this restaurant is " + str(self.number_serv...
import math def x(y): return 4*math.pi*(y**2) for i in [1, 2, 4, 9, 10, 13]: print('%.2f'%x(i)) 4.牛牛的Python老师为了更好地管理班级,利用一个类Student来管理学生,这个类包含了学生姓名(str)、学号(str)、分数(int)、每次作业等级(list[str])等信息。请你帮助牛牛的老师实现这样...
在Python严格的来讲是只有函数,没有过程,就是说不管是什么函数都会有返回值,提到返回值大家的脑海里一定是return,还理解不了的话就看例子吧! 代码语言:javascript 代码运行次数:0 运行 AI代码解释 >>>defname():...print("tianjun")...>>>name()tianjun ...