75. ORM Supplement of django

This navigation: QuerySet Mediation model Query optimization extra   QuerySet 1. Sliceable Use Python's slicing syntax to limit the number of query set records. It is equivalent to the LIMIT and OFFSET clauses of SQL. >>> Entry.objects.all()[:5] # (LIMIT 5) >>> Entry.objects.all()[5:10] # (OFFSET 5 LIMIT 5) Negati ...

Added by eightFX on Sun, 19 May 2019 22:00:31 +0300

Initial use of Mask RCNN (running demo) and problems encountered

Source code: https://github.com/matterport/Mask_RCNN Main problems: Can not create cudnn handle: CUDNN_STATUS_INTERNAL_ERROR and tensorflow.python.framework.errors_impl.UnknownError: Failed to get convolution algorithm. This is probably because cuDNN failed to initialize, so try looking to see if a warning log message was pri ...

Added by siric on Sun, 19 May 2019 15:04:35 +0300

Web Training Knowledge Point-0409

jQuery Animation Effect Exercise I. Animation Hiding and DisplayingMethods: hide () and show ()toggle () indicates the status of switching hide and show $(document).ready(function(){ $("#button1").click(function(){ $ ( "p").hide(500,function(){ alert("Hidden completion") }) ...

Added by mwilson on Sun, 19 May 2019 12:14:40 +0300

udp programming for python network-Socket (24)

Introduction to udp udp - User Datagram Protocol is a simple connectionless datagram-oriented transport layer protocol. udp does not provide reliability; it simply sends datagrams from applications to the IP layer, but it does not guarantee that they will reach their destinations. udp does not need to establish a connection between client a ...

Added by Pobega on Sun, 19 May 2019 07:53:51 +0300

java distributed system deployment learning (6) ansible Ad-hoc and commands module

Ad-Hoc refers to a command executed temporarily under ansible and does not need to be saved. playbook is said after complex commands. When it comes to Ad-hoc, we need to mention modules. All command execution depends on pre-written modules. The default installed ansible already has many modules, such as command, raw, sh ...

Added by mikusan on Sun, 19 May 2019 07:26:17 +0300

Python Learning Notes _02: Using Tkinter to Connect MySQL Database to Realize Login Registration Function

1 Environmental Construction 1.1 Python installation 1.2 MySQL Environment Construction 1.3 Install MySQLdb 2. Realization 2.1 Landing Interface 2.2 Registration Interface 2.3 Specific implementation of part of the code   1 Environmental Construction 1.1 Python installation This paper implements part of Python environment: Python 2.7.1 ...

Added by sasi on Sun, 19 May 2019 06:33:34 +0300

IEEE754 Standard Floating Point Storage Format

Basic storage format (from high to low): Sign + Exponent + Fraction Sign: Symbol bit Exponent: Order Code Fraction: Valid Number Analysis of 32-bit Floating Point Storage Format Sign: 1 bit (31bit) Exponent: 8 bits (8 bits in total from 30 to 23) Fraction: 23 bits (23 bits from 22 to 0) The true value of 32-bit non-zero floating-point n ...

Added by superdude on Sun, 19 May 2019 05:11:24 +0300

Design Mode Software Development Original Open Close Principle and Dependency Inverted Principle

Open and Close Principle Definition The so-called open-close principle is that a software entity such as classes, modules, and functions should be open to extensions and closed to modifications.Emphasizes building a framework with abstraction to achieve expanded detail. It has the advantage of improving the reusability and maintainability of th ...

Added by jonskinny12 on Sun, 19 May 2019 00:02:12 +0300

Some Betta TV Web APIs [Some DouyuTv APIs]

  Written in the forefront Developed before TI5 last year dotaonly.com Web sites need to use APIs of various live platforms. Unlike Twitch, which is not as open as foreign websites, there are ready-made APIs available. Domestic websites are closed and not very friendly to developers. The APIs mentioned in this paper are all crawled from the F ...

Added by KendersPlace on Sat, 18 May 2019 21:08:39 +0300

Python Crawler Crawling Dynamic Page Ideas + Crawling Jingdong Example

brief introduction Sometimes, when we naively download HTML pages using urllib libraries or Scrapy, we find that the elements we want to extract are not in the HTML we download, although they seem to be readily available in browsers. This shows that the elements we want are dynamically generated through js events under some of our operations. F ...

Added by phast1 on Sat, 18 May 2019 10:14:26 +0300