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Comparison with traditional programming ways

While this is more code than we would typically need in traditional programming, there is one key difference. To use datetime.utcnow().isoformat() as a greeting value, we need to define a property greeting that utilizes this value.

property greeting: str using utc_now_iso_format:
mixins/property/greeting/using_utc_now_iso_format_fy.py
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"""fy
property greeting: str using utc_now_iso_format:
"""
from datetime import datetime


# fy:start ===>>>
class Greeting_UsingUtcNowIsoFormat_PropertyMixin:

    @property
    def _greeting(self) -> str:
        # fy:end <<<===
        return datetime.utcnow().isoformat()

Then the flow would look like:

flow Greet_UsingUtcNowIsoFormat -> None:
    property greeting using utc_now_iso_format
    method greet using greeting
flows/greet__using_utc_now_iso_format__fy.py
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"""fy
flow Greet_UsingUtcNowIsoFormat -> None:
    property greeting using utc_now_iso_format
    method greet using greeting
"""
from fy_core.base.flow_base import FlowBase

from mixins.method.greet.using_greeting_fy import (
    Greet_UsinGreeting_MethodMixin,
)
from mixins.property.greeting.using_utc_now_iso_format_fy import (
    Greeting_UsingUtcNowIsoFormat_PropertyMixin,
)


# fy:start ===>>>
class Greet_UsingUtcNowIsoFormat_Flow(
    # Property Mixins
    Greeting_UsingUtcNowIsoFormat_PropertyMixin,
    # Method Mixins
    Greet_UsinGreeting_MethodMixin,
    # Base
    FlowBase[None],
):
    def __call__(self) -> None:
        # fy:end <<<===
        self._greet()

We can explicitly see that usage of datetime.utcnow().isoformat() is not an accident or error, but is intentional.