PerfectCherryBlossom

4-2 动物animals = {"pig", "chicken", "beef cattle"}for animal in animals: print("A " + animal + " can be cooked into a great dish.")print("Any of these animals would make up of a great dish.")4-5

题目来源题目给了一个 csv 文件，读入文件得到一个 DataFrame 对象，该对象中有4个数据集，要对这4个数据集做一些操作。如果不熟悉 python pandas，可以参考 pandas 入门教程Exercise 1题意题解用布尔索引的方式划分数据集，对每个数据集调用相应的函数求解。求线性回归的API是OLS类。endog 参数是因变量， exog 参数是自变量。要先用 add_consta...

Exercise 1: Plotting a function题意题解numpy.linspace 生成一段区间内均匀分布的点。用这个函数生成横坐标。numpy 提供了很多数学函数，这里能用到的有 numpy.sin， numpy.power， numpy.exp， numpy.negative。matplotlib.pyplot 提供了绘制图像的函数 plot，也提供了设置横坐标名、纵坐标名、标...

Exercise 1: Least squares题意题解要求出最小二乘解 x 和残差的范数，用 scipy.linalg.lstsq 函数。from numpy import randomfrom scipy import linalgm = 30n = 20A = random.randn(m, n)b = random.randn(m, 1)x, residual, rank...

Exercise 0题意题解randn(d0, d1, ..., dn) 返回一个n维数组，数组是标准正态分布的样本。用randn函数得到二维数组A。import numpyfrom numpy import randomn = 200m = 500A = random.randn(n, m)numpy库中没有toeplitz函数，scipy.linalg库有。其实可以自己写一个函数生成...

10-4 访客名单file_name = "test.out.txt"with open(file_name, 'w') as file: while True: user_name = input("Please enter your name(enter \'q\' to quit): ") if user_name == 'q': br...

8-4 大号T恤def make_shirt(size = "large", words = "I love Python"): print("A " + size + " T-shirt with \"" + words + "\"")make_shirt()make_shirt(size = "medium")make_shirt(words = "

9-1 餐馆class Restaurant(): def __init__(self, restaurant_name, cuisine_type): self.restaurant_name = restaurant_name self.cuisine_type = cuisine_type def describe_restauran...

11-1 城市和国家# city.pydef get_formatted_city(city, country): message = city.title() message += ", " message += country.title() return message# test_city.pyimport unittestfrom city import ...

7-3 10的整数倍number = int(input("Please enter a number: "))if number % 10 == 0: print(str(number) + " is a multiple of 10.")else: print(str(number) + " is not a multiple of 10.")7-4 披萨配料print("Plea...

6-6 调查favorite_language = { 'jen' : 'Python', 'sarah' : 'c', 'edward' : 'ruby', 'phil' : 'python', 'bill' : 'cpp'}people_to_be_polled = ('edward', 'phil', 'steve', 'harry')for person in...

5-5 外星人颜色#3def print_score(alien_color): pre = "You've got " post = " scores!" if alien_color == "green": print(pre + "5" + post) elif alien_color == "yellow": print(pre + "1.

3-4 嘉宾名单people = ["first person", "second person", "third person"]for person in people: print(person.title() + ", would you like to have dinner with me?")3-5 修改嘉宾名单def invite(people): for person...

2-1 简单消息message = "this is a message"print(message)2-2 多条简单消息message = "this is the first message"print(message)message = "this is the second message"print(message)2-3 个性化消息name = "Eric Matthes"print(...

一、浏览python主页，写下发现和收获    python主页：https://www.python.org    主页是这样形容python的：    Python is powerful... and fast;     plays well with others;     runs everywhere;     is friendly & easy to learn;     ...

题目Step 1：sklearn.datasets.make_classification 函数能随机产生 n_classes 类数据集，返回一组样本(sample)和一组标记(label)。from sklearn import datasetsfrom sklearn import model_selectionfrom sklearn import naive_bayesfrom sk...