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Maximum length for MD5 input/output
What is the maximum length of the string that can have md5 hashed? Or: If it has no limit, and if so what will be the max length of the md5 output value?
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What is the difference between an ORM and an ODM?
I am trying to figure out what the difference is between ORM and ODM, as far as I understand the concept, ORM (Object Relational Mapper) maps the relations between data, where as ODM (Object Document Mapper) deals with documents. Am I right in assuming that mySQL is an example of ORM and MongoDB is ...
Why is require_once so bad to use?
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require_once and include_once both require that the system keeps a log of what's already been included/required. Every *_once call means checking that log. So there's definitely some extra work being done there but enough to detriment the speed of the whole app?
... I really doubt it... Not unles...
What is the difference between compile code and executable code?
...) while "building" denominates the whole process of compiling, linking and whatever else needs to be done of an entire package or project.
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When is the finalize() method called in Java?
...rbage collector is not guaranteed to run at any specific time. In general, what I'm trying to say is finalize() is probably not the best method to use in general unless there's something specific you need it for.
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Using tags to turn off caching in all browsers? [duplicate]
... Why the repeated cache-control and expires? Why do you need all of these? What's so special about 1980? What's the difference between pragma:no-cache and cache-control:no-cache? More explanation would be nice.
– Bennett McElwee
Sep 10 '12 at 23:36
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Why is Hibernate Open Session in View considered a bad practice?
And what kind of alternative strategies do you use for avoiding LazyLoadExceptions?
9 Answers
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How to implement the activity stream in a social network
...e record.
The parent_id/parent_type are useful for my app - they tell me what the activity is related to. If a book was favorited, then parent_id/parent_type would tell me that the activity relates to a book (type) with a given primary key (id)
I index on (user_id, time) and query for activities...
Can someone explain __all__ in Python?
...iable __all__ set in different __init__.py files. Can someone explain what this does?
11 Answers
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How to list all installed packages and their versions in Python?
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If you have pip install and you want to see what packages have been installed with your installer tools you can simply call this:
pip freeze
It will also include version numbers for the installed packages.
Update
pip has been updated to also produce the same outpu...