chadrik commented on a change in pull request #12883:
URL: https://github.com/apache/beam/pull/12883#discussion_r495317141
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File path: sdks/python/apache_beam/metrics/metric.py
##########
@@ -101,23 +121,26 @@ def gauge(namespace, name):
class DelegatingCounter(Counter):
"""Metrics Counter that Delegates functionality to MetricsEnvironment."""
def __init__(self, metric_name):
+ # type: (MetricName) -> None
super(Metrics.DelegatingCounter, self).__init__()
self.metric_name = metric_name
- self.inc = MetricUpdater(cells.CounterCell, metric_name, default=1)
+ self.inc = MetricUpdater(cells.CounterCell, metric_name, default=1) #
type: ignore[assignment]
Review comment:
Here's the workaround:
```python
class DelegatingCounter(Counter):
"""Metrics Counter that Delegates functionality to MetricsEnvironment."""
def __init__(self, metric_name):
# type: (MetricName) -> None
super(Metrics.DelegatingCounter, self).__init__(metric_name)
self._inc = MetricUpdater(cells.CounterCell, metric_name, default=1)
def inc(value=None):
self._inc(value)
```
I don't know the reasoning behind this limitation. Even the simplest
scenario fails on the latest version of mypy:
```python
class Foo(object):
x = None # type: Callable[[], None]
def blah():
# type: () -> None
pass
class Bar(Foo):
def __init__(self):
# type: () -> None
self.x = blah
```
Note that it does work without complaint if the callable is defined on the
class:
```python
class Bar(Foo):
x = blah
```
but we can't do that because `MetricUpdater` needs the `metric_name`.
So, since what's being done in this metrics code is valid python, I thought
ignoring the error was the most expedient path. If mypy fixes this in a future
version, these lines will generate an "unused type ignore" error and we can get
rid of them.
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