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
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...
importpandasaspdfromsklearn.imputeimportSimpleImputerdeffill_missing_values(df):forcolumnindf.columns:ifdf[column].isnull().sum()>0:imputer=SimpleImputer(strategy='mean')df[column]=imputer.fit_transform(df[[column]])returndf# 自动化调用data=pd.read_csv('data.csv')data=fill_missing_values(data...
list(iterable) -> new list initialized from iterable's items"""defappend(self, p_object):#real signature unknown; restored from __doc__"""向列表的末尾添加元素"""L.append(object) -> None -- append object to end"""passdefclear(self):#real signature unknown; restored from __doc__"""...
self.scanner=nmap.PortScanner()defscan(self):self.scanner.scan(self.target)returnself.scanner.all_hosts()defget_device_info(self,host):returnself.scanner[host]['addresses']target_ip='192.168.1.0/24'scanner=AssetScanner(target_ip)hosts=scanner.scan()forhostinhosts:info=scanner.get_device_info(ho...
Imagine I wanted to extract, or access, the first element of my list. 我要做的第一件事是键入列表的名称,然后我需要方括号。 The first thing for me to do is type the name of the list,then I need my square brackets. 现在请记住,在Python中,索引从零开始。 Now remember, in Python, indexe...
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...
Get the value of the first array item: x = cars[0] Try it Yourself » Example Modify the value of the first array item: cars[0] ="Toyota" Try it Yourself » The Length of an Array Use thelen()method to return the length of an array (the number of elements in an array). ...
在不写return时,python 会贴心的给你加上return none,所以说Python的所有函数都是有返回值的 浅谈返回值 学过c语言的同学,最常见的返回值是这样的 代码语言:javascript 代码运行次数:0 复制 Cloud Studio代码运行 return0; 我们长谈返回值的类型是整型,我们的意思是指它会返回一个整型的值,前面提到Python会动态分...
>>> fornuminrange(2, 10):...ifnum % 2 == 0:...print("Found an even number", num)...continue...print("Found an odd number", num) Found an even number 2 Found an odd number 3 Found an even number 4 Found an odd number 5 Found an even number 6 Found an odd number 7 ...