Add read_rds workaround for rdata on Python 3.8.

Author: nathanjmcdougall

pins/drivers.py

@@ -125,6 +125,14 @@ def load_data(
             try:
                 import rdata
 
+                # Can be removed once support for Python 3.8 is dropped.
+                # The issue is that the last `rdata` available on Python 3.8 was v0.9,
+                # which doesn'thave the same `rdata.read_rds()` function.
+                # See https://github.com/rstudio/pins-python/pull/265
+                if not hasattr(rdata, "read_rds"):
+                    parsed = rdata.parser.parse_file(f)
+                    rdata.conversion.convert(parsed)
+
                 return rdata.read_rds(f)
             except ModuleNotFoundError:
                 raise ModuleNotFoundError(