In the last article, we introduced Python's functions and modules, and now we introduce exceptions and files in Python.
To view the previous article, please click: https://www.cnblogs.com/dustman/p/9963920.html
Exceptions and documents
Exceptions are also called exceptions. You've seen exceptions in previous articles. When program runn ...
Added by melittle on Thu, 16 May 2019 13:10:13 +0300
Summary: Understand prototype.
Author: Front end wit
Fundebug Copyright shall be owned by the original author when authorized to reproduce.
Added by webzyne on Thu, 16 May 2019 03:41:26 +0300
1. What is an integrator?
We can create lists directly by using the Formula of Lists. However, due to memory constraints, the list capacity must be limited. Moreover, creating a list of 1 million elements not only takes up a lot of storage space, but if we only need to access the previous one, then most of the elements are wasted. So, if the l ...
Added by irishmike2004 on Wed, 15 May 2019 23:09:25 +0300
What is zero copy?Let's start with a look at traditional I/O operations.Let's say that the user process now copies one file to another.Then the user program must first read this file into memory, and then write the data in memory to another file.However, file read-in memory is not directly read into the memory of user processes, but read into t ...
Added by 121212 on Wed, 15 May 2019 21:45:05 +0300
In this introductory tutorial, we will build an application development environment in Taifang and learn to write a voting intelligence contract.
In this tutorial, let's build a simple "Hello World!" application, which is a voting application.
The application is simple, all it does is initialize a set of candidates, get anyone to vot ...
Added by anon_login_001 on Wed, 15 May 2019 12:57:31 +0300
Since most SIP registry server writings on the web are C/C++/python, post this post and share the JAVA implementation
GB28181 defines the SIP-based video monitoring interconnection specification. For most private protocol-implemented monitoring systems, if they want to access the SIP architecture, they need to use the gateway. GB28181 specifie ...
Added by mickwaffle on Wed, 15 May 2019 08:45:56 +0300
Recently, I used my spare time to read Daika's "React Books", which benefits a lot from explaining React, Redux, etc. from the basic principles.It's better to write it once in a thousand times than to follow the author's thoughts and reference code to implement the basic Demo. Here's a Redux architecture from scratch using na ...
Added by jasraj on Wed, 15 May 2019 05:38:07 +0300
WeChat PK10 program, WeChat airship program, whole station packaging without deletion Download Address Q2952777280
One hot noon in May, I chatted with my little brother about the design model used by the company.
I said jokingly: "Our company does not use many design models, that is, strategy, facade, simple factory, fa ...
Added by Klojum on Wed, 15 May 2019 05:02:17 +0300
There are three functions for converting non-numerical values into numerical values: Number (), parseInt (), and parseFloat ().
Note tip: Number() can be used for any data type; parseInt(),parseFloat() is for strings;
Number() conversion rules are as follows: give some special examples;
The first category: null, undefined
Added by AngelGSD on Tue, 14 May 2019 19:54:41 +0300
netty Learning Summary (I)
What is netty?
netty is an asynchronous, event-driven network programming framework.
Technical Foundation of netty
netty is an encapsulation of Java NIO and Java thread pool technology
What problems did netty solve
Using Java IO for network programming, usually one user and one thread, can not deal with a large number ...
Added by MidOhioIT on Tue, 14 May 2019 19:19:56 +0300