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Converting between datetime, Timestamp and datetime64
... np
>>> dt = datetime.utcnow()
>>> dt
datetime.datetime(2012, 12, 4, 19, 51, 25, 362455)
>>> dt64 = np.datetime64(dt)
>>> ts = (dt64 - np.datetime64('1970-01-01T00:00:00Z')) / np.timedelta64(1, 's')
>>> ts
1354650685.3624549
>>> datetime.utcfromt...
What is the best way to test for an empty string in Go?
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10 Answers
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What is the difference between 'log' and 'symlog'?
...de
pyplot.ion()
# Draw the grid lines
pyplot.grid(True)
# Numbers from -50 to 50, with 0.1 as step
xdomain = numpy.arange(-50,50, 0.1)
# Plots a simple linear function 'f(x) = x'
pyplot.plot(xdomain, xdomain)
# Plots 'sin(x)'
pyplot.plot(xdomain, numpy.sin(xdomain))
# 'linear' is the default mod...
What's the best way to make a d3.js visualisation layout responsive?
Assume I have a histogram script that builds a 960 500 svg graphic. How do I make this responsive so on resize the graphic widths and heights are dynamic?
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Is there a better way to write this null check, and a non-empty check, in groovy?
...trodmahapatro
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How to make a promise from setTimeout
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Update (2017)
Here in 2017, Promises are built into JavaScript, they were added by the ES2015 spec (polyfills are available for outdated environments like IE8-IE11). The syntax they went with uses a callback you pass into the Promise...
Programmatically selecting text in an input field on iOS devices (mobile Safari)
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How to get commit history for just one branch?
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Adam Rosenfield
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answered Jun 7 '13 at 0:06
alexalex
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Django - iterate number in for loop of a template
...n use either:
{{ forloop.counter }} index starts at 1.
{{ forloop.counter0 }} index starts at 0.
In template, you can do:
{% for item in item_list %}
{{ forloop.counter }} # starting index 1
{{ forloop.counter0 }} # starting index 0
# do your stuff
{% endfor %}
More info at: for ...
硬件案例：连接、协议与设备端 · App Inventor 2 中文网
...P；自有 Broker 主机/IP、端口和账号。设备发布 practical/NODE01/telemetry，retain=false。
ENV|NODE01|1|25.6|61.2
设备 ID、非负递增序号、温度、湿度。有效范围分别为 -40–85°C、0–100%；设备重启归零序号后，重新连接应用以清除旧序号。B...