gkxin1的博客

原创 十五周

from sklearn import datasetsfrom sklearn.model_selection import KFoldfrom sklearn.naive_bayes import GaussianNBfrom sklearn.svm import SVCfrom sklearn.ensemble import RandomForestClassifierfrom s...

原创 十四周

1.print( 'The average of x is {:.2f}'.format(anascombe['x'].mean()))print( 'The average of y is {:.2f}'.format(anascombe['y'].mean()))print( 'The variance of x is {:.2f}'.format(anascombe['x'].var(...

原创 十三周

1.最小二乘法import numpy as npm = 20n = 10A = np.random.rand(m,n)b = np.random.rand(m,1)x,_,_,_ = np.linalg.lstsq(A,b,rcond=None)b_ = np.dot(A,x)sum = 0for i in range(n): sum+=(b[i]-b_[i])**2prin...

原创 第十二周

1.x = np.linspace(0,2,50)y = np.sin(x-2) * np.sin(x-2) * np.exp(-x**2)plt.figure(1)plt.xlabel("x")plt.ylabel("y")plt.ylim(-0.1, 1)plt.title(r"$f(x) = sin^2(x-2)e^{-x^2}$")plt.annotate('local ma...

原创 numpy

创建随机矩阵Aimport numpy as np A = np.random.normal(size=[200, 500]) 9-1AA = A + A AAT = np.matmul(A, A.transpose()) ATA = np.matmul(A.transpose(), A) AB = np.matmul(A, B) def mul_A_B_I(A, B,...

原创 169. 求众数

# -*-coding:utf-8-*-class Solution(object): def majorityElement(self, nums): """ :type nums: List[int] :rtype: int """ a = {} for i in nums:...

原创 217. 存在重复元素

class Solution(object): def containsDuplicate(self, nums): """ :type nums: List[int] :rtype: bool """ for i in range(0,len(nums) - 1): a = nums[...

原创 66. 加一

class Solution(object): def plusOne(self, digits): """ :type digits: List[int] :rtype: List[int] """ a = 1 for i in range(len(digits)-1, -1, -1): ...

原创 29. 两数相除

import mathclass Solution(object): def divide(self, dividend, divisor): """ :type dividend: int :type divisor: int :rtype: int """ self.dividend = ...

原创 第十一章练习题

11-1定义函数def get_city_country(city,country): return city+' '+country 测试函数import unittest from name_function import get_city_country class CityCountryTestCase(unittest.TestCase): def t...

原创 第十章练习题

10-6# coding=utf-8while True: number_a = raw_input('请输入一个数字：') number_b = raw_input('请输入另一个数字：') try: numuber_sum = int(number_a) + int(number_b) print('您输入的两个数字之和...

原创 第九章练习题

9-2class Restaurant():    def __init__(self,restaurant_name,cuisine_type):            self.restaurant_name=restaurant_name            self.cuisine_type=cuisine_type    def describe_restaurant(se...

原创 第八章练习题

8-3def make_shirt(size, shape): """show the size and shape of the shirt""" print("The size of the shirt is " + str(size) + " and the shape of the shirt is " + shape +".") make_shirt

原创 第七章练习题

7-1type = raw_input("Which car would you like?")print("Let me see if I can find you a " + type + ".")Which car would you like?bwmLet me see if I can find you a bwm.------------------(program exite...

原创 第六章练习题

6-1person = {'first_name':'gu','last_name':'kx','age':'20','city':'tianjin'}print(person){'city': 'tianjin', 'first_name': 'gu', 'last_name': 'kx', 'age': '20'}------------------(program exited w...

原创 第五章练习题

5-6age = 5if age < 2: print("He is a baby")elif age < 4: print("He is learning walking")elif age < 13: print("He is a child")elif age < 20: print("He is a teenager")elif age &

原创 第四章练习题

4-5numbers = list(range(1,1000000))print(min(numbers))print(max(numbers))print(sum(numbers))4-6odd_numbers = list(range(1,20,2))for number in odd_numbers: print(number)4-9values = [value**3 for value ...

原创 第三章练习题

3-1names = ['Chole','Lucy','Jack']for name in names: print(name)3-2names = ['Chole','Lucy','Jack']for name in names: print(name + ", how are you?")3-5names = ['Chole','Lucy','Jack']for name in names: ...

原创 2-10

在加注释的时候出现了问题，第一次的代码如图运行后显示SyntaxError: Non-ASCII character '\xe6' in file test.py on line 2,but no encoding declared; see http://python.org/dev/peps/pep-0263/ for details上网查找了一下发现是因为Python在默认状态下不支持源文件...

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原创 2-2

原创 2-1

原创 初识python

      这个学期初在选择专选课程的时候，看到了高级编程技术，就比较好奇，什么算是高级的技术呢，后来发现是学习python，因为这门语言我的好多非计算机专业的同学都有涉及，我的理解应该是比较简单，为什么叫高级呢？所以怀着这份好奇就选择了课程。      接触之后，发现那句话“人生苦短，我用python”真的是很有道理，极其简洁的语法，超强的可读性都让他配得上高级二字。      希望未来的我能够...