marclamberti opened a new issue, #48665:
URL: https://github.com/apache/airflow/issues/48665
### Apache Airflow version
3.0.0
### If "Other Airflow 2 version" selected, which one?
_No response_
### What happened?
Hey there,
I think we have an issue with .map(). When I try to loop over the
_MapedResult object, I'm getting a NoneType object error, whereas the exact
same code in AF2.0 works and prints the file.
### What you think should happen instead?
Each file should be printed out on the standard output like in AF 2.0
### How to reproduce
```python
def filter_file_extension(file: str) -> str:
if file.rsplit('.', 1)[1] == 'zip':
return None
return file
@dag
def my_dag():
@task
def return_files() -> list[str]:
return ["a.txt", "b.zip", "c.txt"]
@task
def print_filtered_files(files: list[str]) -> None:
for file in files:
print(file) # <---- 'NoneType' object has not attribute 'rsplit' , in
AF2.0 that prints the file correctly
filtered_files = return_files().map(filter_file_extension)
print_filtered_files(filtered_files)
```
### Operating System
Mac
### Versions of Apache Airflow Providers
_No response_
### Deployment
Docker-Compose
### Deployment details
_No response_
### Anything else?
_No response_
### Are you willing to submit PR?
- [ ] Yes I am willing to submit a PR!
### Code of Conduct
- [x] I agree to follow this project's [Code of
Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)
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