大约有 43,100 项符合查询结果（耗时：0.0317秒） [XML]
Convert Year/Month/Day to Day of Year in Python
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261
There is a very simple solution:
from datetime import datetime
day_of_year = datetime.now().tim...
How to return a part of an array in Ruby?
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195
Yes, Ruby has very similar array-slicing syntax to Python. Here is the ri documentation for th...
Bundler: Command not found
I am hosting on a vps, ubuntu 10.04, rails 3, ruby and mysql installed correctly by following some tutorials. If I run bundle check or bundle install I get the error '-bash: bundle: command not found'. From gem list --local I see 'bundler (1.0.2, 1.0.0)' is installed.
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How to find the installed pandas version
...sion__:
In [76]: import pandas as pd
In [77]: pd.__version__
Out[77]: '0.12.0-933-g281dc4e'
Pandas also provides a utility function, pd.show_versions(), which reports the version of its dependencies as well:
In [53]: pd.show_versions(as_json=False)
INSTALLED VERSIONS
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commit:...
Real life example, when to use OUTER / CROSS APPLY in SQL
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175
Some uses for APPLY are...
1) Top N per group queries (can be more efficient for some cardina...
Compare two DataFrames and output their differences side-by-side
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14 Answers
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Why is 1/1/1970 the “epoch time”?
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Early versions of unix measured system time in 1/60 s intervals. This meant that a 32-bit unsigned integer could only represent a span of time less than 829 days. For this reason, the time represented by the number 0 (called the epoch) had to be set in the very recent pas...
How to use a decimal range() step value?
Is there a way to step between 0 and 1 by 0.1?
33 Answers
33
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Django 1.7 throws django.core.exceptions.AppRegistryNotReady: Models aren't loaded yet
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12 Answers
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