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How does the bitwise complement operator (~ tilde) work?
Why is it that ~2 is equal to -3? How does ~ operator work?
15 Answers
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Using python map and other functional tools
... different functions, but to access it directly from maptest:
foos = [1.0,2.0,3.0,4.0,5.0]
bars = [1,2,3]
def maptest(foo):
print foo, bars
map(maptest, foos)
With your original maptest function you could also use a lambda function in map:
map((lambda foo: maptest(foo, bars)), foos)
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How to reorder data.table columns (without copying)
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2 Answers
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App Inventor 2 低功耗蓝牙(BLE) 硬件接入、数据通信及IO控制 - App Invent...
...为通用、价格低廉的BLE设备从零开始如何利用App Inventor 2开发一款自己专属的手机蓝牙App应用。BLE与经典蓝牙的区别可参考：《低功耗蓝牙(BLE) 和 经典蓝牙(SPP) 的区别》。本文主要通过一款常见的BLE硬件接入控制，介绍硬件接入...
Frequency table for a single variable
...s()?
>>> import pandas
>>> my_series = pandas.Series([1,2,2,3,3,3, "fred", 1.8, 1.8])
>>> my_series
0 1
1 2
2 2
3 3
4 3
5 3
6 fred
7 1.8
8 1.8
>>> counts = my_series.value_counts()
>>> counts
3 3
2 ...
App Inventor 2 拓展参考文档 · App Inventor 2 中文网
... 教育 入门必读 中文教程 IoT专题 AI2拓展 ChatGPT接入 Aia Store 开通VIP 搜索 App Inventor 2 拓展参考文档 ...
Sorting 1 million 8-decimal-digit numbers with 1 MB of RAM
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Redirect stderr and stdout in Bash
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792
Take a look here. Should be:
yourcommand &>filename
(redirects both stdout and stderr ...
What is the reason for having '//' in Python? [duplicate]
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In Python 3, they made the / operator do a floating-point division, and added the // operator t...