add demo; proper readme; remove kython dependencies

my/books/kobo.py

@@ -4,7 +4,7 @@ from .. import paths
 
 @lru_cache()
 def kobuddy_module():
-    from kython import import_from
+    from ..common import import_from
     return import_from(paths.kobuddy.repo, 'kobuddy')
 
 kobuddy = kobuddy_module()

my/coding/github/__init__.py

@@ -4,7 +4,7 @@ from ... import paths
 
 @lru_cache()
 def ghexport():
-    from kython import import_file
+    from ...common import import_file
     return import_file(paths.ghexport.repo / 'model.py')
 
 

my/common.py

@@ -0,0 +1,56 @@
+from pathlib import Path
+import functools
+from typing import Union, Callable, Dict, List, Iterable, TypeVar
+
+# some helper functions
+
+def import_file(p: Union[str, Path], name=None):
+    p = Path(p)
+    if name is None:
+        name = p.stem
+    import importlib.util
+    spec = importlib.util.spec_from_file_location(name, p) # type: ignore
+    foo = importlib.util.module_from_spec(spec)
+    spec.loader.exec_module(foo) # type: ignore
+    return foo
+
+def import_from(path, name):
+    path = str(path)
+    import sys
+    try:
+        sys.path.append(path)
+        import importlib
+        return importlib.import_module(name)
+    finally:
+        sys.path.remove(path)
+
+
+T = TypeVar('T')
+K = TypeVar('K')
+V = TypeVar('V')
+
+def the(l: Iterable[T]) -> T:
+    it = iter(l)
+    try:
+        first = next(it)
+    except StopIteration as ee:
+        raise RuntimeError('Empty iterator?')
+    assert all(e == first for e in it)
+    return first
+
+
+def group_by_key(l: Iterable[T], key: Callable[[T], K]) -> Dict[K, List[T]]:
+    res: Dict[K, List[T]] = {}
+    for i in l:
+        kk = key(i)
+        lst = res.get(kk, [])
+        lst.append(i)
+        res[kk] = lst
+    return res
+
+
+Cl = TypeVar('Cl')
+R = TypeVar('R')
+
+def cproperty(f: Callable[[Cl], R]) -> R:
+    return property(functools.lru_cache(maxsize=1)(f)) # type: ignore

my/hypothesis.py

@@ -1,26 +1,27 @@
 from functools import lru_cache
+from pathlib import Path
 
 from . import paths
 
 @lru_cache()
 def hypexport():
-    from kython import import_file
-    return import_file(paths.hypexport.repo / 'model.py')
+    from .common import import_file
+    return import_file(Path(paths.hypexport.repo) / 'model.py')
 
 Annotation = hypexport().Annotation
 
 def get_model():
-    sources = list(sorted(paths.hypexport.export_dir.glob('*.json')))
+    export_dir = Path(paths.hypexport.export_dir)
+    sources = list(sorted(export_dir.glob('*.json')))
     model = hypexport().Model(sources)
     return model
 
 
-from kython import listdir_abs
 from typing import Dict, List, NamedTuple, Optional, Sequence
 from pathlib import Path
 from datetime import datetime
 
-from kython import group_by_key, the, cproperty
+from .common import group_by_key, the, cproperty
 
 
 class Page(NamedTuple):

my/reading/goodreads.py

@@ -8,7 +8,7 @@ from .. import paths
 
 @lru_cache()
 def goodrexport():
-    from kython import import_file
+    from ..common import import_file
     return import_file(paths.goodrexport.repo / 'model.py')
 
 

my/stackexchange.py

@@ -4,7 +4,7 @@ from . import paths
 
 @lru_cache()
 def stexport():
-    from kython import import_file
+    from .common import import_file
     stexport_model = import_file(paths.stexport.repo / 'model.py')
     return stexport_model