Defining and Calling Python Functions (Overview)

# mypy doesn't seem to handle the function arg dictionary syntax on WSL which
# is running mypy version 0.971 which it believes is the latest.
# The code runs fine in python though which is version 3.8.
# $ mypy --version
# mypy 0.971 (compiled: yes)
# $ python --version
# Python 3.8.0
#
# I also tried it on Crostini in my Pixelbook in a python venv which is
# running later versions but gives the same errors.
# $ mypy --version
# mypy 1.11.2 (compiled: yes)
# $ python --version
# Python 3.11.2
# $ mypy annotation-dict-args.py 
# annotation-dict-args.py:31: error: Invalid type comment or annotation  [valid-type]
# annotation-dict-args.py:32: error: Invalid type comment or annotation  [valid-type]
# Found 2 errors in 1 file (checked 1 source file)
# $ python annotation-dict-args.py 
# {'r': {'desc': 'radius', 'type': <class 'float'>}, 'return': {'desc': 'area', 'type': <class 'float'>}}
# 3.1415926
# 40.715040096
# 12.5663704
#
# Note: specifiying mypy to use a particular python version with
# --python-version x.y didn't help either.
#
def area(r: {'desc': 'radius', 'type': float}) \
         -> {'desc': 'area', 'type': float}:
    return 3.1415926 * (r**2)

print(area.__annotations__)

print(area(1))
print(area(3.6))
#area('barf on this')
print(area(*[2]))
#area(*(2, 'barf on this too'))
#area(['barf', 'on', 'this'])