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How to read/process command line arguments?
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The canonical solution in the standard library is argparse (docs):
Here is an example:
from argparse import ArgumentParser
parser = ArgumentParser()
parser.add_argument("-f", "--file", dest="filename",
help="write report to FILE", metavar="FILE")
pa...
What's the difference between NOT EXISTS vs. NOT IN vs. LEFT JOIN WHERE IS NULL?
...ems to me that you can do the same thing in a SQL query using either NOT EXISTS, NOT IN, or LEFT JOIN WHERE IS NULL. For example:
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When is del useful in python?
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Firstly, you can del other things besides local variables
del list_item[4]
del dictionary["alpha"]
Both of which should be clearly useful. Secondly, using del on a local variable makes the intent clearer. Compare:
del foo
to
foo = None
I know in the case of del foo that the inte...
How to hide action bar before activity is created, and then show it again?
I need to implement splash screen in my honeycomb app.
I use this code in activity's onCreate to show splash:
27 Answers
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What are the “standard unambiguous date” formats for string-to-date conversion in R?
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This is documented behavior. From ?as.Date:
format: A character string. If not specified, it will try
'"%Y-%m-%d"' then '"%Y/%m/%d"' on the first non-'NA' element,
and give an error if neither work...
Where to find Java JDK Source Code? [closed]
...ith all the official source code in it. I just had to tell Eclipse where this file is and I could see the code. But now I don't have the file anymore...
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Alternative to itoa() for converting integer to string C++? [duplicate]
...o itoa() for converting an integer to a string because when I run it in visual Studio I get warnings, and when I try to build my program under Linux, I get a compilation error.
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String concatenation in Ruby
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You can do that in several ways:
As you shown with << but that is not the usual way
With string interpolation
source = "#{ROOT_DIR}/#{project}/App.config"
with +
source = "#{ROOT_DIR}/" + project + "/App.config"
The second method seems to be more efficient in term of memory/speed f...
Difference between abstract class and interface in Python
What is the difference between abstract class and interface in Python?
8 Answers
8
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Compare if BigDecimal is greater than zero
How can I compare if BigDecimal value is greater than zero?
6 Answers
6
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