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Some Python nicieties

Project description

My little lib of Python goodies

Micropy is auto-formatted using yapf.

Nice things

dig()

CSS selector like deep value grabbing from almost any object.

>>> from micropy import dig
>>> dig.xget((1, 2, 3), 1)
2
>>> dig.xget({'foo': 'bar'}, 'foo')
'bar'
>>> dig.dig({'foo': 1, 'bar': [1,2,3]}, 'bar.1')
2
>>> dig.dig({'foo': 1, 'bar': [1,{'baz':'jox'},3]}, 'bar.1.baz')
'jox'
>>>

The difference between dig.dig() and funcy.get_in() is that you can use shell-like blob patterns to get several values keyed by similar names:

>>> from micropy import dig
>>> res = dig.dig({'foo': 1, 'foop': 2}, 'f*')
>>> res
[foo=1:int, foop=2:int]
>>> # (textual representation of an indexable object)
>>> res[0]
foo=1:int
>>> res[1]
foop=2:int
>>>

Programmatic class creation

Programmatic creation of arbitrary named classes in module definition, add methods using a decorator notation:

>>> from micropy import lang
>>> mystuff = (('Foo', 1), ('Bar', 2))
>>> for name, num in mystuff: locals()[name] = lang.mkclass(name, **{'num': num})
>>> Foo
<class 'micropy.lang.Foo'>
>>> Foo.num
1
>>> \
... @Foo.classmethod
... def myclassmethod(cls, x):
...     return x + 1
>>> Foo.myclassmethod(1)
2
>>>
>>> \
... @Foo.staticmethod
... def mystaticmethod(x, y):
...     return x + y
>>> Foo.mystaticmethod(1, 2)
3
>>> \
... @Foo.method
... def mymethod(self, x):
...     self.y = self.num + x
...     return self.y
>>> foo = Foo()
>>> foo.mymethod(1)
2
>>> foo.y
2
>>>

A simple way of creating small DSL’s using Python operator overloading.

>>> from micropy import lang
>>> \
... class PipingExample(lang.Piping):
...     def __add__(self, value) -> lang.Piping:
...         self.queue(lambda a, b: a + b, value)
...         return self
...
>>> simplest_pipe = PipingExample(10)
>>> res = simplest_pipe + 10 + 20
>>> res()
40
>>>

Mostly, you’ll want to use the pipe operator to define simple composition:

>>> from micropy import lang
>>> incr = lambda x: x + 1
>>> showr = "It is {}!".format
>>> (lang.ComposePiping(5) >> incr >> incr >> showr)()
'It is 7!'
>>>

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