A library for Python programming
pip install --upgrade pprog
identity(value, *args, **kwargs) returns the first value value.
perm(values, /, *, cycle) permutates a list according to a cycle notation.
attrgetter(attr, ..., /, *, default) instantiates a callable object that fetches the given attribute(s) from its operand, with default value for missing attributes.
itemgetter(item, ..., /, *, default) instantiates a callable object that fetches the given item(s) from its operand, with muti-level keys and default value for missing items.
ConstantCreator(value, /, *, copy=False) instantiates a callable object that returns the same constant when it is called.
PermArgsExecutor(fun, /, *, perm=None) instantiates a callable object that swaps positional arguments according to a cyclc notation. By default, it permutates the first two arguments.
>>> from pprog import identity
>>> identity("value", "other_input", key="other_keyword_input")
'value'
>>> from pprog import perm
>>> perm(["a", "b", "c", "d", "e", "f", "g"], [1, 2, 4])
['a', 'c', 'e', 'd', 'b', 'f', 'g']
>>> from pprog import AttrCaller
>>> caller = AttrCaller("upper")
>>> caller("test")
'TEST'
>>> from pprog import ConstantCreator
>>> creator = ConstantCreator("value")
>>> creator()
'value'
>>> from pprog import PermArgsExecutor
>>> executor = PermArgsExecutor(range)
>>> executor(4, 2)
range(2, 4)