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原创 machine Learning

how it works:we build a model or an enginegive it lots of datafind and learn patterns and input datasteps:import the Data(.csvclean the Data(remove duplicated data, convert data into numeri...

2020-02-08 20:43:45 93

原创 excel spreadsheets

查找某个cell的值import openpyxl as xlwb = xl.load_workbook('transactions.xlsx')sheet = wb['Sheet1']cell = sheet['a1']cell = sheet.cell(1,1)print(cell.value)最大行数print(sheet.max_row)利用for loop遍历某一列的值...

2020-02-08 11:11:34 291

原创学习笔记

files and directoriesabsolute path(start from the root of our hard-disk)relative path(a path starting from the current directory)

2020-02-08 10:15:55 102

原创 Generating Random Values

throw a diceimport randomclass Dice: def roll(): return random.randint(1, 6), random.randint(1, 6)dice1 = Dice()print(Dice.roll())random.random()random.randiant(num1, num2)

2020-02-07 11:04:10 191

module is a file with some python codes. We use module to organize our code into multiple files. We break our codes into multiple files. Each file is referred to as module.a module should contain al...

2020-02-07 10:34:37 94

原创 Inheritance

inheritance is a mechanism for reusing codesdon’t repeat yourselfto prevent an empty class, add ‘pass’class Mammal: def walk(self): print('walk')class Dog(Mammal): def bark(sel...

2020-02-06 17:50:54 88

原创 Classes

ues classes to define new types to model real conceptsthe new type has the methods for working with this classuse lower case letters to name variables and functions and separate mutiple words using...

2020-02-06 11:07:14 187

原创 exceptions & comments

Exceptionhandle errors in python programexit code 0 means program terminated successfully.try: age = int(input('Age: ')) print(age)except ValueError: print('Invalid value')try: ...

2020-02-06 10:08:12 104

原创 function, parameters, keyword arguments

container for a few lines of codes that perform a specific taskparameters are used to pass information to funtiondef greet_user(name): print(f'Hi {name}!')print('Start')greet_user('John')...

2020-02-05 21:59:10 144

原创 dictionary

store information come as key-value pairseach key should be unique通过key获得valuecustomer = { 'name':'John Smith', 'age':'30', 'is_verified':True}customer['name']customer.get('name')...

2020-02-05 16:33:16 97

原创 unpack

coordinates = (1, 2, 3)x = coordinates[0]y = coordinates[1]z = coordinates[2]x, y, z, = coordinates上下两种结果相同将coordinate解压为3个变量同样的方法适用于列表

2020-02-04 20:05:52 125

原创 Lists ， 2D lists & tuple学习

index指定其中的任何一个元素index修改其中的元素Lists找到最大的数字第一次可能的方法：max方法sort方法input_list = [9, 3, 5, 1, 7, 9]largest_num = 0input_list.sort(reverse = True)largest_num = input_list[0]print(largest_num)逐项比较...

2020-02-04 19:41:14 114

原创 For loops & nested loop学习

while loop is used to excute a block of code multipule times.for loop is used to iterate items of a collection. The collection can be a string, a list, or a range of objects. Each time create a new ...

2020-02-04 17:16:22 584

原创 While loop 学习

Guess gametarget_num = 9guess_num = 0i = 1result = ''while i <= 3: guess_num = int(input("Guess: ")) if guess_num == target_num: result = 'You win!' i = 4 else: ...

2020-02-03 19:04:17 858

原创基本操作

这里写自定义目录标题欢迎使用Markdown编辑器新的改变功能快捷键合理的创建标题，有助于目录的生成如何改变文本的样式插入链接与图片如何插入一段漂亮的代码片生成一个适合你的列表创建一个表格设定内容居中、居左、居右SmartyPants创建一个自定义列表如何创建一个注脚注释也是必不可少的KaTeX数学公式新的甘特图功能，丰富你的文章UML 图表FLowchart流程图导出与导入导出导入欢迎使用Ma...

2019-05-07 12:27:00 135

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