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 # snippets
 
-This is a collection of independent python snippets used in the pyiron project, but hopefully useful elsewhere too.
+This is a collection of independent python snippets which we in the pyiron project find generically useful.
 
 To qualify for inclusion, a snippet must not have any dependencies outside the python standard library, and should fit reasonably inside a single file.
+
+(Note that the _tests_ may have non-standard dependencies, e.g. to ensure the snippets work in various edge cases we care about, but the actual snippets themselves must be able to behave well in a clean environment.)
+
+
+# Summary
+
+The snippets may have more functionality that this -- taking a look at the test suite is the best way to get an exhaustive sense of their functionality -- but these examples will give you the gist of things.
+
+## Colors
+
+Just a shortcut to the `seaborn.color_palette()` of colors in hex:
+
+```python
+>>> from snippets.colors import SeabornColors
+>>> SeabornColors.white
+'#ffffff'
+
+```
+
+## Deprecate
+
+Easily indicate that some functionality is being deprecated
+
+```python
+>>> from snippets.deprecate import deprecate
+>>> 
+>>> @deprecate(message="Use `bar(a, b)` instead", version="0.5.0")
+... def foo(a, b):
+...     pass
+>>> foo(1, 2)
+
+```
+
+Raises a warning like `DeprecationWarning: __main__.foo is deprecated: Use bar(a, b) instead. It is not guaranteed to be in service in vers. 0.5.0 foo(1, 2)`
+
+
+## DotDict
+
+A dictionary that allows dot-access. Has `.items()` etc.
+
+```python
+>>> from snippets.dotdict import DotDict
+>>> 
+>>> d = DotDict({"a": 1})
+>>> d.b = 2
+>>> print(d.a, d.b)
+1 2
+
+```
+
+## Factory
+
+Make dynamic classes that are still pickle-able
+
+```python
+>>> from abc import ABC
+>>> import pickle
+>>>
+>>> from snippets.factory import classfactory
+>>>
+>>> class HasN(ABC):
+...     '''Some class I want to make dynamically subclass.'''
+...     def __init_subclass__(cls, /, n=0, s="foo", **kwargs):
+...         super(HasN, cls).__init_subclass__(**kwargs)
+...         cls.n = n
+...         cls.s = s
+...
+...     def __init__(self, x, y=0):
+...         self.x = x
+...         self.y = y
+>>>
+>>> @classfactory
+... def has_n_factory(n, s="wrapped_function", /):
+...     return (
+...         f"{HasN.__name__}{n}{s}",  # New class name
+...         (HasN,),  # Base class(es)
+...         {},  # Class attributes dictionary
+...         {"n": n, "s": s}
+...         # dict of `builtins.type` kwargs (passed to `__init_subclass__`)
+...     )
+>>> Has2 = has_n_factory(2, "my_dynamic_class")
+>>>
+>>> foo = Has2(42, y=-1)
+>>> print(foo.n, foo.s, foo.x, foo.y)
+2 my_dynamic_class 42 -1
+
+>>> reloaded = pickle.loads(pickle.dumps(foo))  # doctest: +SKIP
+>>> print(reloaded.n, reloaded.s, reloaded.x, reloaded.y)  # doctest: +SKIP
+2 my_dynamic_class 42 -1  # doctest: +SKIP
+
+```
+
+(Pickle doesn't play well with testing the docs -- you can't run `pickle.dumps(pickle.loads(5))` either!)
+
+
+## Files
+
+Shortcuts for filesystem manipulation
+
+```python
+>>> from snippets.files import DirectoryObject, FileObject
+>>>
+>>> d = DirectoryObject("some_dir")
+>>> d.write(file_name="my_filename.txt", content="Some content")
+>>> f = FileObject("my_filename.txt", directory=d)
+>>> f.is_file()
+True
+>>> f2 = f.copy("new_filename.txt", directory=d.create_subdirectory("sub"))
+>>> f2.read()
+'Some content'
+>>> d.file_exists("sub/new_filename.txt")
+True
+>>> d.delete()
+
+```
+
+
+## Has post
+
+A meta-class introducing a `__post__` dunder which runs after the `__init__` of _everything_ in the MRO.
+
+```python
+>>> from snippets.has_post import HasPost
+>>> 
+>>> class Foo(metaclass=HasPost):
+...     def __init__(self, x=0):
+...         self.x = x
+...         print(f"Foo.__init__: x = {self.x}")
+>>> 
+>>> class Bar(Foo):
+...     def __init__(self, x=0, post_extra=2):
+...         super().__init__(x)
+...         self.x += 1
+...         print(f"Bar.__init__: x = {self.x}")
+... 
+...     def __post__(self, *args, post_extra=2, **kwargs):
+...         self.x += post_extra
+...         
+...         print(f"Bar.__post__: x = {self.x}")
+>>>         
+>>> Bar().x
+Foo.__init__: x = 0
+Bar.__init__: x = 1
+Bar.__post__: x = 3
+3
+
+```
+
+Honestly, try thinking if there's another way to solve your problem; this is a dark magic.
+
+## Import alarm
+
+Fail gracefully when optional dependencies are missing for (optional) functionality.
+
+```python
+>>> from snippets.import_alarm import ImportAlarm
+>>>
+>>> with ImportAlarm(
+...     "Some functionality unavailable: `magic` dependency missing"
+... ) as my_magic_alarm:
+...     import magic
+>>>
+>>> with ImportAlarm("This warning won't show up") as datetime_alarm:
+...     import datetime
+>>>
+>>> class Foo:
+...     @my_magic_alarm
+...     @datetime_alarm
+...     def __init__(self, x):
+...         self.x = x
+... 
+...     @property
+...     def magical(self):
+...         return magic.method(self.x)
+...
+...     def a_space_odyssey(self):
+...         print(datetime.date(2001, 1, 1))
+...     
+>>>
+>>> foo = Foo(0)
+>>> # Raises a warning re `magic` (since that does not exist)
+>>> # but not re `datetime` (since it does and we certainly have it)
+>>> foo.a_space_odyssey()
+2001-01-01
+
+>>> try:
+...     foo.magical(0)
+... except NameError as e:
+...     print("ERROR:", e)
+ERROR: name 'magic' is not defined
+
+```
+
+## Logger
+
+Configures the logger and writes to `pyiron.log`
+
+## Retry
+
+If at first you don't succeed
+
+```python
+>>> from time import time 
+>>> 
+>>> from snippets.retry import retry
+>>> 
+>>> def at_most_three_seconds():
+...     t = int(time())
+...     if t % 3 != 0:
+...         raise ValueError("Not yet!")
+...     return t
+>>>         
+>>> retry(at_most_three_seconds, msg="Tried and failed...", error=ValueError) % 3
+0
+
+```
+
+Depending on the system clock at invokation, this simple example may give warnings like `UserWarning: Tried and failed... Trying again in 1.0s. Tried 1 times so far...` up to two times.
+
+
+## Singleton
+
+A metaclass for the [singleton pattern](https://en.wikipedia.org/wiki/Singleton_pattern).
+
+```python
+>>> from snippets.singleton import Singleton
+>>> 
+>>> class Foo(metaclass=Singleton):
+...     pass
+>>> 
+>>> foo1 = Foo()
+>>> foo2 = Foo()
+>>> foo1 is foo2
+True
+
+```
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