q learning python

valuesMy_dict.clear () Empty dictionarySeven. Collection(1) Unordered non-repeating element (key) set; similar to dictionary, but without "value"Created: X=set ()X={key1,key2,...}Add and remove X.add (' body ')X.remove (' body ')Operators for Collections:- | ！ =(2) The set principle is the same as the dict, so it is also not possible to put mutable objects, because it is not possible to determine whether two mutable objects are equal, and there is no guarantee that the set will "have no duplic

Python can be used in many ways as a common language:Web Application Development : Server-side programming, with a rich web development framework, such as Django and TurboGears, to quickly complete a Web site development and Web services. Typical such as the domestic watercress, shell nets, such as Google, Dropbox, etc.; System network Operation : operation and maintenance work, there are a lot of repetitive work place, and need to do the management s

, key is a list, error List is not hash7 Traceback (most recent):8File"", Line 1,inch9Typeerror:unhashable Type:'List' #list is non-hashedTen>>>Conversion between a collection and a listSet () List ()1>>> lst=[1,2,3]2>>> s =Set (LST) #将列表转换成集合3>>>s4Set ([1, 2, 3])5>>> Lst2 =list (s) #将集合转换为列表6>>>Lst27[1, 2, 3]8>>> a =[1,2,2,3,3,6,6,8,9, 0,0] #去除列表中的重复项, set () can be used9>>> s =set (a)Ten>>>s OneSet ([0, 1, 2, 3, 6, 8, 9]) A>>> A =List (s) #去除重复后, and then convert to lists ->>>a -[0, 1, 2, 3, 6

condition 1: 2 EXECUTE statement 1 ... 3 elif Judging condition 2: 4 EXECUTE statement 2 ... 5 elif Judging condition 3: 6 EXECUTE statement 3 ... 7 Else : 8 Execute Statement 4 ...Examples are as follows:1 #! /user/bin/env Ptyhon2 #-*-coding:utf-8-*-3 #Author:visonwong4 5Age = 276 7user_input = Int (input ("input your guess num:"))8 9 ifUser_input = =Age :Ten Print("Congratulations, you got it!") One elifUser_input Age : A Print("Oops,think bigger!") - Else: - Print

...)3.1.4. ListsThe sequence as one of the basic Python formats is fantastic. Here are some simple examples of how to use the list.Defining a sequence that looks a bit complicated is actually not complicated.LST = [0, 1, 2, 3, 4, 5, ' A ', ' B ', [8, 888], ' 9 ', {' 10 ': 10, 10:100}]LST[1] # 11 integersLST[8] # [8, 888] a sequenceLST[9] # ' 9 ' a stringLST[10] # {' 10 ': 10, 10:100} A dictionaryIt seems to be very flexible, it is so capricious.Slice

Basic Learning notes for exception handling and Python learning notes An exception is an action taken outside the normal control flow due to a program error. The action is divided into two phases. The first stage is an error that causes an exception. When the system detects an error and is aware of the exception condition, the interpreter (or a programmer can ca

Object-oriented python learning [entry], python object-oriented Preface Recently, I have been studying Python object-oriented programming. I have never been familiar with other object-oriented programming languages before. Therefore, learning this part is quite exciting. I w

Learning a language is a constant practice, Python is currently used for data analysis of the most popular language, I recently bought a book "Data analysis Using Python" (Wes McKinney), but also to the library to borrow this "Python Data analysis Basic Tutorial--numpy study Guide" (second edition), ready to the

I was reading a senior student, a small white one, want to learn artificial intelligence. I will share what I have learned every day, and hope that those with whom I like to learn and communicate with each other.So let's start with Python. The first time to write a blog, the heart is a little excited. Hee Hee　　　　　　　This tutorial is very simple and can be skipped directly if there is a programming basis for the person. I mainly think of nothing to unde

First, the foregoingNumPy(numerical python abbreviation) is an open source Python Scientific Computing Library. Use NumPy , you can use arrays and matrices in a very natural way . Numpy contains many useful mathematical functions, including linear algebra operations, Fourier transforms, and random number generation functions . The Library's predecessor was a library for array operations that began in 1995