Python Notes for Files & Exceptions

Python Notes for Files & Exceptions Article directory Python Notes for Files & Exceptions 1. Read data from files 1.1 Read the entire file 1.2 File Path 1.3 read line by line 1.4 Create a list of all lines of a file 1.5 Contents of User Files 1.6 Processing large files 2 Write to file 2.1 Write empty files 2.2 W ...

Posted by ebgames56 on Wed, 08 May 2019 22:54:03 +0200

Pthon Decorator Advancement

Catalog Decorator Advancement 1. Decorated functions have multiple parameters. 2. Decorated functions have return values 3. Embedding decorators in functions 4. Decorators summary Decorator Advancement As you already know from the previous article, if you still don't under ...

Posted by bdeonline on Wed, 08 May 2019 21:45:02 +0200

python crawls through the free fiction Web

These days, my friends say they want to read e-books, but they can only read them on the Internet, but they can't download them to the local area. What can I do? I looked at several novel websites. You can only read them directly on the Internet. To download txt, you have to buy members for money, and you can't copy and paste them directly on t ...

Posted by ironman on Wed, 08 May 2019 19:27:03 +0200

Introduction to using pipenv

conda was used as a virtual environment management tool during development, but sometimes it is temporary and necessary.If you use conda create to create a new environment, it takes a lot of time, sometimes forgot to delete it, and finally a bunch of virtual environments in the system.After accidentally discovering pipenv, try it out and feel t ...

Posted by illushinz on Wed, 08 May 2019 17:36:02 +0200

Public Approaches to Python Foundation

Common methods: Lists, tuples, dictionaries and strings can be used together. Python built-in functions Listing of built-in functions function describe Remarks len(item) Calculate the number of elements in the container del(item) Delete variables del has two methods max(item) Returns the maximum value of the element in the container I ...

Posted by flashbot on Wed, 08 May 2019 11:30:03 +0200

Nodejs/Php/Java Runtime for Table Storage Trigger Function Computing Example

Preface Function Compute is an event-driven service. Through function computing, users do not need to manage the operation of servers, but only write code and upload it. Function computing prepares computing resources and runs user code in a flexible and scalable manner, while users only need to pay for the resources consumed by running the act ...

Posted by blui on Wed, 08 May 2019 01:50:03 +0200

Creative Patterns: Factory Approach

Article firstCreative Patterns: Factory Approach brief introduction Name: Factory Method English name: Factory method Pattern Values: Expansion is my monopoly Personal introduction: Define an interface for creating an object, but let subclasses decide which class to instantiate. Factory Methods lets a class defer instantiation to subclasses. ...

Posted by FFEMTcJ on Tue, 07 May 2019 18:45:04 +0200

Ruby Array Method Arrangement

Array method collation Method List: all(), any(), none() and one() Testing whether all or part of the elements in an array satisfy a given condition. Conditions can be determined in a block of statements or parameters. append() Equivalent to push() bsearch() Dichotomy Finding Elements bsearch_index() Dichotomy Finds Elements and Returns ...

Posted by ricoche on Tue, 07 May 2019 13:35:03 +0200

Python 3 object-oriented programming, error and exception handling

Class and instance Classes are abstract templates, and instances are concrete "objects" created according to classes. Terminology explanation Class: A collection of objects that describe the same properties and methods. It defines the properties and methods common to each object in the set. Objects are instances of ...

Posted by kevgais on Tue, 07 May 2019 10:40:04 +0200

Redis 7000w+ keys && 16G memory 100% repair experience

cause We always use redis of Aliyun. We are not a high concurrent application. We mainly use redis as distributed locks and a small amount of caches. It hardly needs maintenance. Yesterday afternoon, we suddenly received an alarm email. On-line redis memory is used 100% and instantaneous nerve tension sensation is confirmed by console.This is a ...

Posted by jim_de_bo on Mon, 06 May 2019 15:00:04 +0200