大约有 44,300 项符合查询结果（耗时：0.0415秒） [XML]
How do I install Python OpenCV through Conda?
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Is there a Python function to determine which quarter of the year a date is in?
...ore the division, and dividing by 4 instead of 3. Since .month goes 1 to 12, it's easy to check for yourself what formula is right:
for m in range(1, 13):
print m//4 + 1,
print
gives 1 1 1 2 2 2 2 3 3 3 3 4 -- two four-month quarters and a single-month one (eep).
for m in range(1, 13):
prin...
What is your favorite C programming trick? [closed]
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votes
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Pandas percentage of total with groupby
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Paul H's answer is right that you will have to make a second groupby object, but you can calcu...
How to use a switch case 'or' in PHP
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512
switch ($value)
{
case 1:
case 2:
echo "the value is either 1 or 2.";
break;...
How do I check if an array includes a value in JavaScript?
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How can I get zoom functionality for images?
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UPDATE
I've just given TouchImageView a new update. It now includes Double Tap Zoom and Fling...
An error occurred while installing pg (0.17.1), and Bundler cannot continue
I just installed Rails 4.0.2 and when creating a new app, in the bundle stage I get:
16 Answers
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Any way to properly pretty-print ordered dictionaries?
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edited Apr 9 '14 at 12:09
user11784
2344 bronze badges
answered Feb 4 '11 at 12:33
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Strange, unexpected behavior (disappearing/changing values) when using Hash default value, e.g. Hash
...s in the array, despite h[1] still giving us a value? Here’s a hint:
h[42] #=> ["a", "b"]
The array returned by each [] call is just the default value, which we’ve been mutating all this time so now contains our new values. Since << doesn’t assign to the hash (there can never be a...