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【App Inventor 2 数据可视化】使用柱状图和饼图收集数据 - App应用开发 - ...
...的App Inventor伴侣（安卓设备AI伴侣版本号在 2.65 以上）（iOS 电子表格功能目前正在开发中）。没有电子设备?要在计算机上使用模拟器，请检查[安装说明]。
你能做什么?：挑战：把你的数据做成图表为什么要开发一个收集数据的...
How to open a file for both reading and writing?
...
@JossefHarush Note that the documentation for a states 'on some Unix systems, means that all writes append to the end of the file regardless of the current seek position'. In this case the f.seek(0) won't work as expected. I just fell foul of this on Linux.
...
error: writable atomic property cannot pair a synthesized setter/getter with a user defined setter/g
... had the same problem and after doing a bit of research, here is my conclusion about this issue:
The compiler warns you about a @property that you declared as atomic (i.e. by omitting the nonatomic keyword), yet you provide an incomplete implementation of how to synchronize access to that property....
How do I rename a repository on GitHub?
...et-url origin git@github.com:someuser/newprojectname.git
Or in older versions of Git, you might need:
$ git remote rm origin
$ git remote add origin git@github.com:someuser/newprojectname.git
(origin is the most common remote name, but it might be called something else.)
But if there are lots ...
How to properly stop the Thread in Java?
I need a solution to properly stop the thread in Java.
9 Answers
9
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Hashing a file in Python
...o the crux of your problem, I believe, when we consider the memory implications of working with very large files. We don't want this bad boy to churn through 2 gigs of ram for a 2 gigabyte file so, as pasztorpisti points out, we gotta deal with those bigger files in chunks!
import sys
import hashli...
Skip rows during csv import pandas
...an try yourself:
>>> import pandas as pd
>>> from StringIO import StringIO
>>> s = """1, 2
... 3, 4
... 5, 6"""
>>> pd.read_csv(StringIO(s), skiprows=[1], header=None)
0 1
0 1 2
1 5 6
>>> pd.read_csv(StringIO(s), skiprows=1, header=None)
0 1
...
How to load assemblies in PowerShell?
...
LoadWithPartialName has been deprecated. The recommended solution for PowerShell V3 is to use the Add-Type cmdlet e.g.:
Add-Type -Path 'C:\Program Files\Microsoft SQL Server\110\SDK\Assemblies\Microsoft.SqlServer.Smo.dll'
There are multiple different versions and you may want to pick...
What's the difference between SCSS and Sass?
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For the difference between SCSS and Sass, this text on the Sass documentation page should answer the question:
There are two syntaxes available for Sass. The first, known as SCSS (Sassy CSS) and used throughout this reference, is an extension of the syntax of CSS. This means that every valid CSS s...
test a file upload using rspec - rails
...dited Apr 10 '15 at 18:21
Mauricio Gracia Gutierrez
7,41444 gold badges4949 silver badges7474 bronze badges
answered Nov 28 '11 at 13:16
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