emkornfield commented on a change in pull request #4021:
URL: https://github.com/apache/iceberg/pull/4021#discussion_r796832091
##########
File path: python/tests/io/test_base.py
##########
@@ -88,8 +95,15 @@ def exists(self):
def to_input_file(self):
return LocalInputFile(location=self.location)
- def create(self, overwrite: bool = False) -> None:
- return open(self.parsed_location.path, "wb" if overwrite else "xb")
+ def create(self, overwrite: bool = False) -> OutputStream:
+ output_file = open(self.parsed_location.path, "wb" if overwrite else
"xb")
+ if not isinstance(output_file, OutputStream):
+ raise RuntimeError(
+ """
Review comment:
nit: the formatting on this looks weird, is there some way to get black
to make a better choice?
##########
File path: python/src/iceberg/io/base.py
##########
@@ -24,7 +24,40 @@
"""
from abc import ABC, abstractmethod
-from typing import Union
+from typing import Protocol, Union, runtime_checkable
+
+
+@runtime_checkable
+class InputStream(Protocol):
+ def read(self, n: int) -> bytes:
+ ...
Review comment:
docs for methods? Or maybe a top level doc that these should have the
same semantics as IOBase?
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