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Update core.py [If funnction do not return any thing then warning will be pop up] #28680

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Update core.py [If funnction do not return any thing then warning will be pop up] #28680

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13 changes: 12 additions & 1 deletion sdks/python/apache_beam/transforms/core.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1423,15 +1423,21 @@ def _check_fn_use_yield_and_return(fn):
source_code = _get_function_body_without_inners(fn)
has_yield = False
has_return = False
if len(source_code)==0:
return None
Comment on lines +1426 to +1427
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What is the purpose of this check?

for line in source_code.split("\n"):
if line.lstrip().startswith("yield ") or line.lstrip().startswith(
"yield("):
has_yield = True
if line.lstrip().startswith("return ") or line.lstrip().startswith(
"return("):
has_return = True
if line.lstrip().startswith("return None"):
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The warn could also be placed here instead, eliminating the need for the elif block.

return None
if has_yield and has_return:
return True
if not has_return and not has_yield:
return None
return False
except Exception as e:
_LOGGER.debug(str(e))
Expand Down Expand Up @@ -1484,8 +1490,13 @@ def __init__(self, fn, *args, **kwargs):
'Using yield and return in the process method '
'of %s can lead to unexpected behavior, see:'
'https://github.com/apache/beam/issues/22969.',
self.fn.__class__)
self.fn.__class__)

elif _check_fn_use_yield_and_return(self.fn.process) is None:
_LOGGER.warning(
'no iterator is returned by the process method in %s',
self.fn.__class__)

Comment on lines +1495 to +1499
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Mechanically you probably don't want to re-run _check_fn_use_yield_and_return() here. Consider capturing the output value the first time and using that here instead

# Validate the DoFn by creating a DoFnSignature
from apache_beam.runners.common import DoFnSignature
self._signature = DoFnSignature(self.fn)
Expand Down
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