fix build

satella/coding/structures/dictionaries/cache_dict.py

@@ -11,6 +11,39 @@ from satella.coding.typing import K, V, NoArgCallable
 logger = logging.getLogger(__name__)
 
 
+_TIME_MODIFIERS = [
+    ('s', 1),
+    ('m', 60),
+    ('h', 60 * 60),
+    ('d', 24 * 60 * 60),
+    ('w', 7 * 24 * 60 * 60)
+]
+def _parse_time_string(s: tp.Union[int, float, str]) -> float:
+    """
+    Parse a time string into seconds, so eg. '30m' will be equal to 1800, and so will
+    be '30 min'.
+
+    This will correctly parse:
+    - seconds
+    - minutes
+    - hours
+    - days
+    - weeks
+
+    .. warning:: This does not handle fractions of a second!
+
+    :param s: time string or time value in seconds
+    :return: value in seconds
+    """
+    if isinstance(s, (int, float)):
+        return s
+
+    for modifier, multiple in _TIME_MODIFIERS:
+        if modifier in s:
+            return float(s[:s.index(modifier)]) * multiple
+
+    return float(s)
+
 
 class CacheDict(tp.Mapping[K, V]):
     """