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How to estimate how much memory a Pandas' DataFrame will need?
I have been wondering... If I am reading, say, a 400MB csv file into a pandas dataframe (using read_csv or read_table), is there any way to guesstimate how much memory this will need? Just trying to get a better feel of data frames and memory...
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What linux shell command returns a part of a string? [duplicate]
I want to find a linux command that can return a part of the string. In most programming languages, it's the substr() function. Does bash have any command that can be used for this purpose. I want to be able to do something like this...
substr "abcdefg" 2 3 - prints cde .
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Can someone explain mappedBy in JPA and Hibernate?
I am new to hibernate and need to use one-to-many and many-to-one relations. It is a bi-directional relationship in my objects, so that I can traverse from either direction. mappedBy is the recommended way to go about it, however, I couldn't understand it. Can someone explain:
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Is it feasible to do (serious) web development in Lisp? [closed]
...n it as a back-end to Apache using mod_proxy as a reverse proxy, or as a stand-alone server.
Various HTML generation solutions are available, from PHP-style templates to Lisp macro hacks to XSLT. Just take your pick.
HTML-TEMPLATE is one example.
Closure XML is available for XML parsing, serializa...
Pointer vs. Reference
... Explain what you mean by arithmetic. A new user may not understand that you want to adjust what the pointer is pointing at.
– Martin York
Sep 22 '08 at 16:30
7
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What is the difference between “ is None ” and “ ==None ”
...o quote:
A class is free to implement
comparison any way it chooses, and it
can choose to make comparison against
None mean something (which actually
makes sense; if someone told you to
implement the None object from
scratch, how else would you get it to
compare True against itself...
Maven: how to override the dependency added by a library
...d on using transitive dependencies.
Resources :
Dependency Mediation and Conflict Resolution
Introduction to the Dependency Mechanism
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Haskell, Lisp, and verbosity [closed]
For those of you experienced in both Haskell and some flavor of Lisp, I'm curious how "pleasant" (to use a horrid term) it is to write code in Haskell vs. Lisp.
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Validating an XML against referenced XSD in C#
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You need to create an XmlReaderSettings instance and pass that to your XmlReader when you create it. Then you can subscribe to the ValidationEventHandler in the settings to receive validation errors. Your code will end up looking like this:
using System.Xml;
using System.X...
Dynamically generating a QR code with PHP [closed]
...rate,
the chl is the url-encoded string you want to change into a QR code, and
the choe is the (optional) encoding.
The link, above, gives more detail, but to use it just have the src of an image point to the manipulated value, like so:
<img src="https://chart.googleapis.com/chart?chs=300x300&...