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Extracting specific columns from a data frame
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answered Apr 19 '15 at 21:19
Sam FirkeSam Firke
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Omitting the second expression when using the if-else shorthand
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269
This is also an option:
x==2 && dosomething();
dosomething() will only be called if...
Javascript: formatting a rounded number to N decimals
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25
That's not a rounding ploblem, that is a display problem. A number doesn't contain information ...
How do I check what version of Python is running my script?
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21 Answers
21
Active
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How can I use pickle to save a dict?
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802
Try this:
import pickle
a = {'hello': 'world'}
with open('filename.pickle', 'wb') as handle:
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How to download Xcode DMG or XIP file?
...ion (6.3, 5.1, etc.) only the latest revision is kept in the list.)
Xcode 12
12.2 beta
12 (Requires macOS 10.15.4 or later) (Latest as of 17-Sept-2020)
Xcode 11
11.7 (Latest as of Sept 02 2020)
11.6
11.5
11.4.1 (Requires macOS 10.15.2 or later)
11.3.1
11.2.1
11.1
11 (Requires macOS 10.1...
App Inventor 2 中文网支持OpenAI的ChatGPT对话及AI绘图（AI伴侣2.67及以上...
App Inventor 2 中文网已经升级ChatBot及ImageBot组件。
App Inventor 2 参考文档 · App Inventor 2 中文网
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App Inventor 2 参考文档
App Inventor 2 参考文档分为以下几大类：内置块参考文档、组件参考文档、拓展参考文档、概念参考文档、其他技术文档及App Inve...
App Inventor 2 实现上传文件到服务器全方案总结 · App Inventor 2 中文网
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App Inventor 2 实现上传文件到服务器全方案总结
App Inventor 2 实现上传文件到服务器全方案总结
1、图片Base64化
2、通用（二级制）文件上...
How to tell Jackson to ignore a field during serialization if its value is null?
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1122
To suppress serializing properties with null values using Jackson >2.0, you can configure th...