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Reverse / invert a dictionary mapping
...Python 2.7.x
inv_map = {v: k for k, v in my_map.iteritems()}
For Python 3+:
inv_map = {v: k for k, v in my_map.items()}
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Sort hash by key, return hash in Ruby
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answered Mar 11 '14 at 2:03
Mark ThomasMark Thomas
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What does a b prefix before a python string mean?
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63
This is Python3 bytes literal. This prefix is absent in Python 2.5 and older (it is equivalent t...
How do you remove a specific revision in the git history?
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To combine revision 3 and 4 into a single revision, you can use git rebase. If you want to remove the changes in revision 3, you need to use the edit command in the interactive rebase mode. If you want to combine the changes into a single revisi...
Bash script to receive and repass quoted parameters
...l of quoting at all. I.E. just call the above script like:
./test.sh 1 2 "3 4"
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Understanding exactly when a data.table is a reference to (vs a copy of) another data.table
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143
Yes, it's subassignment in R using <- (or = or ->) that makes a copy of the whole object. ...
cannot load such file — zlib even after using rvm pkg install zlib
I installed zlib package and ruby 1.9.3 using rvm, but whenever I try to install
gems it says
cannot load such file -- zlib
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how to provide a swap function for my class?
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