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How can I check whether a numpy array is empty or not?
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317
You can always take a look at the .size attribute. It is defined as an integer, and is zero (0)...
COUNT DISTINCT with CONDITIONS
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261
You can try this:
select
count(distinct tag) as tag_count,
count(distinct (case when entryI...
Idiomatic way to convert an InputStream to a String in Scala
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197
For Scala >= 2.11
scala.io.Source.fromInputStream(is).mkString
For Scala < 2.11:
sca...
How to subtract a day from a date?
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1378
You can use a timedelta object:
from datetime import datetime, timedelta
d = datetime.today...
How can I increment a char?
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180
In Python 2.x, just use the ord and chr functions:
>>> ord('c')
99
>>> ord(...
List all the modules that are part of a python package?
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145
Yes, you want something based on pkgutil or similar -- this way you can treat all packages ali...
MySQL 'create schema' and 'create database' - Is there any difference
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140
The documentation of MySQL says :
CREATE DATABASE creates a database
with the given nam...
Is it possible for a unit test to assert that a method calls sys.exit()
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155
Yes. sys.exit raises SystemExit, so you can check it with assertRaises:
with self.assertRaise...
Algorithm to find Largest prime factor of a number
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134
Actually there are several more efficient ways to find factors of big numbers (for smaller one...