8000 uploading first draft of sample code for python-circular-import · realpython/materials@e5fb093 · GitHub
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uploading first draft of sample code for python-circular-import
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‎python-circular-import/entity-relations/people/__init__.py

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‎python-circular-import/entity-relations/people/__main__.py

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from people import club, person
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def main():
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p1 = person.Person("John", 30)
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p2 = person.Person("Jane", 29)
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c = club.Club("Tennis Club", [p1, p2])
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print(c)
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if __name__ == "__main__":
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main()

‎python-circular-import/entity-relations/people/club.py

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# from __future__ import annotations
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# from typing import TYPE_CHECKING
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# if TYPE_CHECKING:
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# from people.person import Person
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from people.person import Person
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class Club:
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def __init__(self, name, members: list[Person] = []):
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self.name = name
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self.members = members
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def __str__(self):
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return f"{self.name} ({len(self.members)} members)"

‎python-circular-import/entity-relations/people/person.py

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# from __future__ import annotations
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# from typing import TYPE_CHECKING
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# if TYPE_CHECKING:
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# from people.club import Club
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from people.club import Club
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class Person:
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def __init__(self, name, age, clubs: list[Club] = []):
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self.name = name
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self.age = age
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self.clubs = clubs
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def __str__(self):
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return f"{self.name} ({self.age})"

‎python-circular-import/entity-relations/people_runtime/__init__.py

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‎python-circular-import/entity-relations/people_runtime/__main__.py

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from people_runtime import club, person
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def main():
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p1 = person.Person("John", 30)
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p2 = person.Person("Jane", 29)
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c = club.Club("Tennis Club")
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c.assign_member(p1)
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c.assign_member(p2)
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print(c)
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if __name__ == "__main__":
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main()

‎python-circular-import/entity-relations/people_runtime/club.py

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# from people_runtime.person import Person
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class Club:
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def __init__(self, name):
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self.name = name
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self.members = set()
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def __str__(self):
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return f"{self.name} ({len(self.members)} members)"
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def assign_member(self, person):
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from people_runtime.person import Person
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if isinstance(person, Person):
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self.members.add(person)
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if self not in person.clubs:
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person.join_club(self)
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else:
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raise ValueError("Can only assign instances of Person")

‎python-circular-import/entity-relations/people_runtime/person.py

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# from people_runtime.club import Club
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class Person:
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def __init__(self, name, age):
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self.name = name
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self.age = age
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self.clubs = set()
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def __str__(self):
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return f"{self.name} ({self.age})"
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def join_club(self, club):
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from people_runtime.club import Club
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if isinstance(club, Club):
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self.clubs.add(club)
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if self not in club.members:
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club.assign_member(self)
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else:
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raise ValueError("Can only join instances of Club")

‎python-circular-import/entity-relations/pyproject.toml

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‎python-circular-import/layered-architecture/pyproject.toml

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