Chapter 7 Data Regulation: Cleanup, Conversion, Merge, Reshaping (3)

Chapter 7 Data Regulation: Cleanup, Conversion, Merge, Reshaping (3) Merge overlapping data Numpy.where() A vectorized if-else import pandas as pd;import numpy as np from pandas import Series,DataFrame a = Series([np.nan,2.5,np.nan,3.5,4.5,np.nan],index=['f','e','d','c','b','a']) Out[8]: f NaN e 2.5 d ...

Added by bsteimel on Tue, 07 Jul 2020 18:25:57 +0300

iOS Development Notes | custom label with inner margin

iu preface UIScrollView has contentInset, but UILabel doesn't; Android does, iOS doesn't. Recently, I need to use a label with inner margin, so I encapsulated it with the code of my predecessors on the Internet. Originally, I wanted to create a category, but it failed. The code is as follows, inherited from UILabel: . h file: #impo ...

Added by Goofan on Sat, 04 Jul 2020 19:08:54 +0300

mybatis Series IV: Dynamic SQL

Dynamic SQL is a powerful feature of MyBatis.When using JDBC to manipulate data, concatenating conditions into SQL strings can be painful if there are too many query conditions. The usual solution is to write a lot of if-else conditional statements and strings to concatenate, and make sure you don't forget spaces or omit commas at the end of fi ...

Added by jaikar on Tue, 07 Jul 2020 18:08:09 +0300

21. Use of AlertDialog Common Dialog

Target Effect In this interface, there is a text input box and a button, enter content in the text input box, then click the button to bring up a customized normal dialog box, in which the prompt information is the information entered in the text box. The target effect map is as follows: Page Layout <LinearLa ...

Added by daniel_lee_hill on Sat, 04 Jul 2020 18:22:34 +0300

Canvas Getting Started 6 requestAnimationFrame for Animation

The learning resources for this article come from "Graphics, Animation and Game Development of HTML5 Canvas Core Technologies" Try not to use setInterval and setTimeout to animate, but rather use the requestAnimationFrame() method to let the browser decide the frame rate on its own. Because browsers differ in the implementation of ...

Added by dawho9 on Tue, 07 Jul 2020 17:40:43 +0300