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Python argparse: default value or specified value

I would like to have a optional argument that will default to a value if only the flag is present with no value specified, but store a user-specified value instead of the default if the user specifies a value. Is there already an action available for this? ...
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How to reset Django admin password?

I am using Django (version 1.3) and have forgotten both admin username and password. How to reset both? 21 Answers ...
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What's “this” in JavaScript onclick?

What does this mean in the script? 8 Answers 8 ...
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HQL ERROR: Path expected for join

I keep trying variations of this query and can't seem to make this happen. I've also referenced this post: Path Expected for Join! Nhibernate Error and can't seem to apply the same logic to my query. My User object has a UserGroup collection. ...
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Changing a specific column name in pandas DataFrame

I was looking for an elegant way to change a specified column name in a DataFrame . 9 Answers ...
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Is it possible to set transparency in CSS3 box-shadow?

Is it possible to set transparency on the box shadow? 1 Answer 1 ...
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How to retrieve Request Payload

I'm using PHP , ExtJS and ajax store . 2 Answers 2 ...
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Regular vs Context Free Grammars

I'm studying for my computing languages test, and there's one idea I'm having problems wrapping my head around. 8 Answe...
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What does map(&:name) mean in Ruby?

I found this code in a RailsCast : 16 Answers 16 ...
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How does a Java HashMap handle different objects with the same hash code?

As per my understanding I think: 14 Answers 14 ...