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Below are snippets for ASmith.
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Fri. Aug. 18th, 2006 11:10 AM 
Builds and prints a list of all links in a specified webpage
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Quick way to get the users home directory in Unix/Linux and Windows
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Decompress a .tar.bz2 archive in Pytho
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Computes the difference between two dates in seconds
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Reads well formed RSS entries using standard python libraries
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Reads a file line by line using Python in 3 lines
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Very fast method for extracting all of the unique items from a list while preserving their original ordering.
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Introduction
This function is a function that returns a function. You pass it a function, and it returns a function that takes a collection as a parameter and applies your function to it. The difference between this and map is that this returns a function that you can use again which takes a collection as a parameter.
For Example
If I had a collection c, and a function p that prints its argument, I can create a visitor function using the following:
printVisitor=createVisitor(p)
Then any time I want to print a collection I just type:
printVisitor(c)
A Better Example
If you were writing an IRC server you would probably have many functions that operated on a list of users, such as ban,makeop, etc. You could create those functions in a manor similar to the following:
banUsers=createVisitor(ban)
makeOperators=createVisitor(makeop)
Then in a seperate file you could use these functions as if they were regular functions.
you would type banUsers(users) to ban, or makeOperators(users) to promote those users.
This function is a function that returns a function. You pass it a function, and it returns a function that takes a collection as a parameter and applies your function to it. The difference between this and map is that this returns a function that you can use again which takes a collection as a parameter.
For Example
If I had a collection c, and a function p that prints its argument, I can create a visitor function using the following:
printVisitor=createVisitor(p)
Then any time I want to print a collection I just type:
printVisitor(c)
A Better Example
If you were writing an IRC server you would probably have many functions that operated on a list of users, such as ban,makeop, etc. You could create those functions in a manor similar to the following:
banUsers=createVisitor(ban)
makeOperators=createVisitor(makeop)
Then in a seperate file you could use these functions as if they were regular functions.
you would type banUsers(users) to ban, or makeOperators(users) to promote those users.
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Translates text from using translate.google.com
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Returns a safe copy if the value argument is mutable, otherwise returns the original argument. If the feedback keyword argument is True, then a tuple is returned containing the resulting argument, and whether or not is was mutable.
