Created
May 25, 2024 06:19
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python events
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events = {} | |
def register_event(event: str, fn: callable): | |
if not event in events: | |
events[event] = [] | |
events[event].append(fn) | |
def dispatch(event: str, *args, **kwargs): | |
if not event in events: | |
raise ValueError("event %s is not registered!" % event) | |
handlers = events[event] | |
for fn in handlers: | |
fn(*args, **kwargs) | |
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import functools | |
from lib_event import register_event, dispatch | |
users = {} | |
def send_email(user): | |
print("email has been sent to %s" % user["email"]) | |
def notify(msg, user): | |
print("%s: %s" % (msg, user)) | |
def create_user(name): | |
if name in users: | |
print("user %s already created!" % name) | |
return | |
user = {"name": name, "email": name + "@python.org", "password": "123"} | |
users[name] = user | |
dispatch("user_created", user) | |
def change_password(name, password): | |
if name not in users: | |
print("user %s not found!" % name) | |
return | |
user = users[name] | |
user["password"] = password | |
dispatch("password_changed", user) | |
def main(): | |
print("> create user") | |
create_user("irul") | |
print("> create user") | |
create_user("jaka") | |
print("> create user") | |
create_user("irul") | |
print("> change password") | |
change_password("jaka", "456") | |
print("> all users") | |
for name in users: | |
print(users[name]) | |
if __name__ == '__main__': | |
register_event("user_created", functools.partial(notify, "user successfuly created")) | |
register_event("user_created", send_email) | |
register_event("password_changed", functools.partial(notify, "password successfuly changed")) | |
register_event("password_changed", send_email) | |
main() |
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