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patterns.py

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from vector2d_v3 import Vector2d

# tag::KEYWORD_PATTERNS[]

def keyword_pattern_demo(v: Vector2d) -> None:

match v:

case Vector2d(x=0, y=0):

print(f'{v!r} is null')

case Vector2d(x=0):

print(f'{v!r} is vertical')

case Vector2d(y=0):

print(f'{v!r} is horizontal')

case Vector2d(x=x, y=y) if x==y:

print(f'{v!r} is diagonal')

case _:

print(f'{v!r} is awesome')

# end::KEYWORD_PATTERNS[]

# tag::POSITIONAL_PATTERNS[]

def positional_pattern_demo(v: Vector2d) -> None:

match v:

case Vector2d(0, 0):

print(f'{v!r} is null')

case Vector2d(0):

print(f'{v!r} is vertical')

case Vector2d(_, 0):

print(f'{v!r} is horizontal')

case Vector2d(x, y) if x==y:

print(f'{v!r} is diagonal')

case _:

print(f'{v!r} is awesome')

# end::POSITIONAL_PATTERNS[]

def main():

vectors = (

Vector2d(1, 1),

Vector2d(0, 1),

Vector2d(1, 0),

Vector2d(1, 2),

Vector2d(0, 0),

)

print('KEYWORD PATTERNS:')

for vector in vectors:

keyword_pattern_demo(vector)

print('POSITIONAL PATTERNS:')

for vector in vectors:

positional_pattern_demo(vector)

if __name__ == '__main__':

main()