Use mypy annotations#9
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Fix error when `dependencies` Cargo key is not found
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kjeremy
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Nov 18, 2020
esteve
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May 6, 2021
| from colcon_core.environment_variable import EnvironmentVariable | ||
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| """Environment variable to override the Cargo executable""" | ||
| # Environment variable to override the Cargo executable |
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Depends what you use to generate the documentation, but if we're talking about sphinx, it doesn't support extracting docstrings from variables unfortunately
| return os.environ[environment_variable] | ||
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| which = shutil.which(executable_name) | ||
| if which: |
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This already returns None if the executable_name can't be found, so it can be simplified as:
return shutil.which(executable_name)
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yes, agree, I 'll change it back
| if value: | ||
| return value | ||
| return shutil.which(executable_name) | ||
| if environment_variable in os.environ: |
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This change is equivalent to the existing code, why the change?
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I find queyring directly the os.environ more readable in a couple of ways:
- There's no need for the intermediate
valuevariable, which doesn't say much about the value it holds anyway - the environment in python is just a dictionary, so using an
osfunction,getenv, to manipulate it sounds unnecessary since there are already established ways of querying a dictionary.
In any case, it's not terribly important, I can revert the change if you think it was better before.
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Since colcon packages mandate Pytyhon 3.5 or higher, we can use explicit mypy annotations to document function parameters and output types instead of docstrings. I'm also removing the docstrings for the types since sphinx can parse and create documentation for mypy types.
Current PR also includes: Fix KeyError exception when
dependenciesCargo key is not found (it's tightly coupled with the change in mypy types - hence I can't make a separate PR for it.