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preface This time mainly explains the circular statements, including the use of if statements and their nested statements, for statements and while statements. 1, IF statement people = 20 cats = 30 dogs = 15 if people < cats: print("Too many cats! The world is doomed!") if people > cats: print("Not many cats! The wo ...

catalogue 1. Title Description 2. Problem solving analysis 3. Code implementation 1. Title Description We have n buildings, numbered from 0 to n - 1. There are several employees in each building. As it is the season to change buildings, some employees want to live in another building. Give you an array of requests, where requests[i] = [ ...

0. Preface Tensorflow is an open source machine learning framework based on Python. It is developed by Google and has rich applications in graphics classification, audio processing, recommendation system and natural language processing. It is one of the most popular machine learning frameworks at present. TensorFlow2.0 was released in Octobe ...

day10 string 1. Correlation functions: len, str, eval str (data) - converts the specified data into a string (any type of data can be converted into characters; when converting, it is directly quoted outside the printed value) eval (string) - evaluates the result of a string expression 2. String correlation method join character str ...

ndarray object of Numpy Library 1, ndarray object of numpy One of the most important features of numpy is its The dimensional array object ndarray is a collection of a series of data of the same type. The index of the elements in the collection starts with the subscript 0 To create an ndarray, you only need to call Numpy's array functio ...

day 8 course summary String related functions: len, str, eval Str (data) converts the specified data into a string (put quotation marks directly outside the printed value of the data) eval (string) evaluates the result of a string expression str1 = '[10, 20, 30]' result = eval(str1) print(result) result.append(100) print(res ...

String function 1.capitalize character string. capitalize () - change the first letter of the string to uppercase and the other letters to lowercase str = "this is string example from runoob....wow!!!" str.capitalize() center() - returns a string centered on the specified width, fillchar is the filled character, and the default is space. ...

1. Basic questions Given a list of numbers, print all odd numbers in the list list1 = [1,2,3,4,5] for x in list1: if x %2 != 0: print(x) Given a list of numbers, print all the numbers in the list that can be divided by 3 but cannot be divided by 2 nums = [23, 45, 78, 90, 8, 21] for x in nums: if x % 3 == 0 and x % 2 != 0: ...

Python thread, role of with (automatically acquire and release Lock) import threading import time num=0 #Global variables can be read and written by multiple threads to transfer data mutex=threading.Lock() #Create a lock class Mythread(threading.Thread): def run(self): global num with mutex: #The function of with Lock ...

brief introduction Flask is a lightweight WSGI Web application framework. It is designed to make getting started quick and easy and can be extended to complex applications. Originally a simple wrapper around Werkzeug and Jinja, it has become one of the most popular Python Web application frameworks. Flash source code Flash User Guide 1, ...