Mongodb update array $pull modifier

1. $pull modifier deletes qualifying elements from the array in the following format: { $pull: { <field1>: <value|condition>, <field2>: <value|condition>, ... } } 2. Specify a value to delete all lists Give a document under a stores collection { _id: 1, fruits: [ "apples", "pears", "oranges", "grapes", "bana ...

Posted by vex__ on Mon, 20 Jul 2020 16:51:29 +0200

Learn Python together: thread

thread The thread module of python is a lower level module, and the threading module of python is a package for thread, which can be used more conveniently Using the threading module Single thread execution #coding=utf-8 import time def saySorry(): print("Honey, I'm wrong. Can I eat now?") time.sleep(1) if __name__ == "__main__": ...

Posted by Toshiba23 on Sun, 19 Jul 2020 18:09:13 +0200

Several methods to find the maximum and minimum values in an integer array

In integer arrays, we need to get the maximum and minimum values of array elements from them: Method 1: Sort using Array first, then from the sorted array, the first element is the smallest and the last element is the largest.   public static int FindMaxNumber(params int[] stringValue) { Array.Sort(stringV ...

Posted by gmp on Sun, 19 Jul 2020 16:30:03 +0200

commons-lang3 tool class learning (2)

From http://commons.apache.org/proper/commons-lang/javadocs/api-release/org/apache/commons/lang3/ Official documents to organize and remember for yourself 3. BooleanUtils Boolean Tool Class and(boolean...array) logic and BooleanUtils.and(true, true) = true BooleanUtils.and(false, false) = false ...

Posted by dvd420 on Fri, 17 Jul 2020 17:51:35 +0200

offer rotation array

Moving the first elements of an array to the end of an array is called array rotation. Input a rotation of a non decreasing sort array and output the smallest element of the rotated array. For example, if the array {3,4,5,1,2} is a rotation of {1,2,3,4,5}, the minimum value of the array is 1. NOTE: all elements given are greater than 0. If th ...

Posted by aximbigfan on Thu, 09 Jul 2020 18:00:14 +0200

python dota2 data 3 download winner data

python dota2 data 3 download winner data Goal: Download five heroes from each winner or loser for subsequent analysis. Because get_match_history() does not include wins or losses in the return, but also uses get_for each matchMatch_Details() query, less efficient. Use another API to query the contest, get_match_history_by_seq_num(): { ...

Posted by Tea_J on Tue, 07 Jul 2020 18:23:14 +0200

[code explanation] using Python 3 + Tkinter to develop class attendance system with graphical interface

Using easy to learn Python and its powerful tripartite library to develop a simple attendance system: 1. Development background 2. Implementation process -Data reading -Data slicing and comparison matching -Graphic development 3. Operation effect -Interface -Choose the path -Read data -Final effec ...

Posted by trouble706 on Tue, 30 Jun 2020 09:24:24 +0200

[code explanation] using Python 3 + Tkinter to develop class attendance system with graphical interface

Using easy to learn Python and its powerful tripartite library to develop a simple attendance system: 1. Development background 2. Implementation process -Data reading -Data slicing and comparison matching -Graphic development 3. Operation effect -Interface -Choose the path -Read data -Final effec ...

Posted by devxtech on Tue, 30 Jun 2020 08:47:22 +0200

Collect Cache Persist of Spark cache

  All of them have the function of gathering data and pulling data storage. mark their respective roles. Collect: /** * Return an array that contains all of the elements in this RDD. * * @note This method should only be used if the resulting array is expected to be small, as * all the data is loaded into the driver's memory. ...

Posted by Brian W on Tue, 30 Jun 2020 05:44:38 +0200

Simple implementation of gesture Sliding Monitoring in Android, the source of PHP live platform

realization Declaration and creation of gesture monitor The statement is as follows: private GestureDetector detector = null;// Declare a gesture monitor Create the following: // Create a GestureDetector object and override the relevant methods detector = new GestureDetector(this, new GestureDe ...

Posted by shadownet on Mon, 29 Jun 2020 09:45:43 +0200