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How to draw polygons on an HTML5 canvas?
...e a path with moveTo and lineTo (live demo):
var ctx = canvas.getContext('2d');
ctx.fillStyle = '#f00';
ctx.beginPath();
ctx.moveTo(0, 0);
ctx.lineTo(100,50);
ctx.lineTo(50, 100);
ctx.lineTo(0, 90);
ctx.closePath();
ctx.fill();
...
Should I use single or double colon notation for pseudo-elements?
...
Do not use both combined with a comma. A CSS 2.1 compliant (not CSS3 capable) user agent will ignore the whole rule:
When a user agent cannot parse the selector (i.e., it is not valid CSS 2.1), it must ignore the selector and the following declaration block (if any)...
Find integer index of rows with NaN in pandas dataframe
...an use to index back into df, e.g.:
df['a'].ix[index[0]]
>>> 1.452354
For the integer index:
df_index = df.index.values.tolist()
[df_index.index(i) for i in index]
>>> [3, 6]
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Getting a list item by index
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answered Mar 17 '13 at 2:06
Mitch WheatMitch Wheat
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What's the maximum value for an int in PHP?
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124
From the PHP manual:
The size of an integer is
platform-dependent, although a maximum
value of...
Face recognition Library [closed]
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edited Jul 29 '13 at 0:11
hippietrail
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Generate random numbers following a normal distribution in C/C++
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edited Dec 29 '18 at 3:27
MultiplyByZer0
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How exactly does a generator comprehension work?
...em out of the expression, one by one.
>>> my_list = [1, 3, 5, 9, 2, 6]
>>> filtered_list = [item for item in my_list if item > 3]
>>> print(filtered_list)
[5, 9, 6]
>>> len(filtered_list)
3
>>> # compare to generator expression
...
>>> filte...
differences between 2 JUnit Assert classes
The JUnit framework contains 2 Assert classes (in different packages, obviously) and the methods on each appear to be very similar. Can anybody explain why this is?
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How do I parallelize a simple Python loop?
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202
Using multiple threads on CPython won't give you better performance for pure-Python code due t...