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原创 6.13 sklearn

\机器学习相关内容（不是特别懂）简单的来说就自己随机生成一个数据集，然后用3种拟合算法拟合，然后评估这个模型拟合的效果。代码如下from sklearn import datasetsfrom sklearn import model_selectionfrom sklearn.naive_bayes import GaussianNBfrom sklearn.svm import SVC...

2018-06-20 00:20:41 236

原创 5.30python scipy

import scipy.linalgimport numpy as npm = 20n = 10A = np.random.normal(size = (m,n))b = np.random.normal(size = (m,1))x, residual, _, __ = scipy.linalg.lstsq(A, b)print("x:",x)print("residual...

2018-06-03 17:36:53 275

原创 5.23 Matplotlib

import matplotlib.pyplot as pltimport numpy as npimport mathx = np.linspace(0,2,1000)y = np.power(np.sin(x-2),2) * np.power(math.exp(1),-np.power(x,2))plt.plot(x,y)plt.xlabel("x-axis")plt.yla...

2018-05-29 14:07:27 290

原创 5.16 numpy exercise

toep = list(i for i in range(1,501))A = np.random.normal(size= (200, 500))

2018-05-20 17:20:20 291

原创 5.2python leetcode 120

120. TriangleGiven a triangle, find the minimum path sum from top to bottom. Each step you may move to adjacent numbers on the row below.For example, given the following triangle[ [2], [3,4],...

2018-05-06 17:42:39 189

213. House Robber IIYou are a professional robber planning to rob houses along a street. Each house has a certain amount of money stashed. All houses at this place are arranged in a circle. That means...

2018-05-06 13:41:58 239

原创 4.25python Leetcode 45

45. Jump Game IIGiven an array of non-negative integers, you are initially positioned at the first index of the array.Each element in the array represents your maximum jump length at that position.You...

2018-04-30 23:20:27 380

原创 4.23python Leetcode array 41

Leetcode41. First Missing PositiveGiven an unsorted integer array, find the smallest missing positive integer.Example 1:Input: [1,2,0]Output: 3Example 2:Input: [3,4,-1,1]Output: 2Example 3:Input: ...

2018-04-29 22:01:16 202

原创 4.9python作业

# 11-1city_funcitons.pydef city_function(city, country): return city + ', ' + countryimport unittestfrom city_functions import city_functionclass TestCityFunction(unittest.TestCase): def te...

2018-04-15 14:26:32 267

原创 4.4python作业

# 10-4file_name = 'guest_book.txt'with open(file_name, 'a') as file: while(True): name = input("Please enter your name:") if(name == 'quit'): break file.writ...

2018-04-08 12:39:15 206

原创 4.2python作业

# 9-1 & 9-4class Restaurant(): def __init__(self, name, type_): self.restaurant_name = name self.cuisine_type = type_ self.number_served = 0 def describe_restaura...

2018-04-04 20:38:13 299

原创 3.28python作业

# 8-2def favorite_book(book_name): print("One of my favorite book is "+ book_name)favorite_book('Sherlock')# 8-5def describe_city(city, country = 'China'): print(city + " is in " + coun...

2018-04-01 14:31:08 188

原创 3.26python作业

# 7-2num = input("How many people do you have?")num = int(num)if (num >= 8): print("Sorry, there are no desk available.")else: print("Welcome. This way please.")# 7-5while True: ...

2018-03-28 20:41:04 248

原创 3.21python作业

# 6-1friend1 = { 'first_name' : 'Donald', 'last_name' : 'Trump', 'age' : '71', 'city' : 'New York',}for key in friend1: print(key + ' is '+friend1[key])# 6-5rivers = { ...

2018-03-24 00:25:01 289

原创 3.19python作业

# 5-3alien_color = 'green'if alien_color == 'green': print('You get 5 points!')# 5-4alien_color = 'red'if 'green' == alien_color: print('You get 5 points!')else: print('You get 10 p...

2018-03-24 00:24:43 199

原创 3.14python作业

# 4-2animals = ['cat', 'dog', 'tiger']for animal in animals: print(animal)for animal in animals: print('A ' + animal + ' would make a great pet')print('Any of these animals has a mouth!'...

2018-03-15 16:45:44 503

原创 3.12python作业

# 3-1names = ['James', 'Trump', 'Mike', 'John']print(names[0])print(names[1])print(names[2])print(names[-1])# 3-4names = ['James', 'Trump', 'John']print(names[0] + ', I invite you to my dinn...

2018-03-14 00:30:12 437

原创 3.7python作业

# 2-1msg = "aa"print(msg)# 2-2msg = 'aaa'print(msg)msg = 'bbb'print(msg)#2-3name = "Control_xu"print("Hello " + name + ", how are you?")#2-4name = 'Donald trump'print(name.upper())print(...

2018-03-10 17:16:58 439

原创 3.5python作业

1、看了python主页，看到python版本的发布还是非常快的，基本一个月就有一个新版本，而且还是3.6和3.7同时进行的，说明这个语言的更新非常快，在目前具有强大的生命力，而且有横向的竞争。在主页看到一些基本的语法，应该是比c/c++方便的，定义变量不需要声明类型，直接用就可以，而且不用考虑溢出，十分友好。2、如果学了python，应该会试着开发一些程序。最希望的还是开发一些人工智能、机器学习...

2018-03-07 10:39:53 239

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