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Add column with constant value to pandas dataframe [duplicate]
Given a DataFrame:
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How to tell which version of a gem a rails app is using
I'm investigating a rails app - the prod server has two version of a specific gem installed, how can I tell which version the prod app is using?
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Iterating over every two elements in a list
How do I make a for loop or a list comprehension so that every iteration gives me two elements?
21 Answers
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Is there an alternative to bastard injection? (AKA poor man's injection via default constructor)
I most commonly am tempted to use "bastard injection" in a few cases. When I have a "proper" dependency-injection constructor:
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What is a difference between
What is the difference between <? super E> and <? extends E> ?
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Fluid or fixed grid system, in responsive design, based on Twitter Bootstrap
I'm getting confused about the various options in the twitter bootstrap grid , and how they go together.
5 Answers
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Secure hash and salt for PHP passwords
It is currently said that MD5 is partially unsafe. Taking this into consideration, I'd like to know which mechanism to use for password protection.
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Efficiency of purely functional programming
Does anyone know what is the worst possible asymptotic slowdown that can happen when programming purely functionally as opposed to imperatively (i.e. allowing side-effects)?
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How do I tell if a regular file does not exist in Bash?
I've used the following script to see if a file exists:
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How do I set default values for functions parameters in Matlab?
Is it possible to have default arguments in Matlab? For instance, here:
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