Python2012-04-07
Schwartzian Transform in python
The technique, attributed to Randal Schwartz of the Perl community, sorts the elements of a list by a metric which maps each element to its "sort value". In Python, just use the ke
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Python2012-04-07
Multidimensional list (array) in python
The reason is that replicating a list with * doesn't create copies, it only creates references to the existing objects. The *3 creates a list containing 3 references to the same li
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Array in python
Lists are equivalent to C or Pascal arrays in their time complexity; the primary difference is that a Python list can contain objects of many different types.
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Remove duplicates from a list in python
If you don't mind reordering the list, sort it and then scan from the end of the list, deleting duplicates as you go
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Iterate over a sequence in reverse order in python
Use the reversed() built-in function, which is new in Python 2.4
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Convert between tuples and lists in python
The type constructor tuple(seq) converts any sequence (actually, any iterable) into a tuple with the same items in the same order.
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Python2012-04-07
Perl's chomp() equivalent for removing trailing newlines from strings in python
Starting with Python 2.2, you can use S.rstrip("\r\n") to remove all occurrences of any line terminator from the end of the string S without removing other trailing whitespace. If
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Convert number to string in python
To convert, e.g., the number 144 to the string ‘144', use the built-in type constructor str(). If you want a hexadecimal or octal representation, use the built-in functions hex()
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Convert string to number in python
For integers, use the built-in int() type constructor, e.g. int('144') == 144. Similarly, float() converts to floating-point, e.g. float('144') == 144.0.
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Hexadecimal and Octal integers in python
To specify an octal digit, precede the octal value with a zero, and then a lower or uppercase 'o'. For example, to set the variable 'a' to the octal value '10' (8 in decimal), type
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Ternary operator in python
C language's ternary operator equivalent was added in Python 2.5. The syntax would be as follows
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Callable objects in python
You can make a higher order function in Python using two choices: you can use nested scopes or you can use callable objects. For example, suppose you wanted to define linear(a,b) w
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