Python-сообщество

 def alternative_abs(a, b):
    result = a - b
    return result * -1 if result <= 0 else result

  
>>> n = 2 - 4
>>> n = -n if n < 0 else n
>>> n
2
>>> 
>>> 
>>> n = 2 - 4
>>> n = (n, -n)[n < 0]
>>> n
2
>>>

 (n, -n)[n < 0]

numbers.Integral

    These represent elements from the mathematical set of integers (positive and negative).

    There are two types of integers:

    Integers (int)

        These represent numbers in an unlimited range, subject to available (virtual) memory only. For the purpose of shift and mask operations, a binary representation is assumed, and negative numbers are represented in a variant of 2’s complement which gives the illusion of an infinite string of sign bits extending to the left.

    Booleans (bool)

        These represent the truth values False and True. The two objects representing the values False and True are the only Boolean objects. The Boolean type is a subtype of the integer type, and Boolean values behave like the values 0 and 1, respectively, in almost all contexts, the exception being that when converted to a string, the strings "False" or "True" are returned, respectively.

    The rules for integer representation are intended to give the most meaningful interpretation of shift and mask operations involving negative integers.

[guest@localhost ~]$ pydoc3
pydoc - the Python documentation tool

pydoc3 <name> ...
    Show text documentation on something.  <name> may be the name of a
    Python keyword, topic, function, module, or package, or a dotted
    reference to a class or function within a module or module in a
    package.  If <name> contains a '/', it is used as the path to a
    Python source file to document. If name is 'keywords', 'topics',
    or 'modules', a listing of these things is displayed.

pydoc3 -k <keyword>
    Search for a keyword in the synopsis lines of all available modules.

pydoc3 -p <port>
    Start an HTTP server on the given port on the local machine.  Port
    number 0 can be used to get an arbitrary unused port.

pydoc3 -b
    Start an HTTP server on an arbitrary unused port and open a Web browser
    to interactively browse documentation.  The -p option can be used with
    the -b option to explicitly specify the server port.

pydoc3 -w <name> ...
    Write out the HTML documentation for a module to a file in the current
    directory.  If <name> contains a '/', it is treated as a filename; if
    it names a directory, documentation is written for all the contents.

[guest@localhost ~]$ pydoc3 -p 1234
Server ready at http://localhost:1234/
Server commands: [b]rowser, [q]uit
server>

  
>>> n = -2.0
>>> 
>>> n = (n * n) ** 0.5
>>> n
2.0
>>>