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core: make with_alisteners() example workable. (#30059)

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**Description:**

5 fix of example from function with_alisteners() in
libs/core/langchain_core/runnables/base.py
Replace incoherent example output with workable example's output.

1. SyntaxError: unterminated string literal
    print(f"on start callback starts at {format_t(time.time())}
    correct as
    print(f"on start callback starts at {format_t(time.time())}")

2. SyntaxError: unterminated string literal
    print(f"on end callback starts at {format_t(time.time())}
    correct as
    print(f"on end callback starts at {format_t(time.time())}")

3. NameError: name 'Runnable' is not defined
    Fix as
    from langchain_core.runnables import Runnable

4. NameError: name 'asyncio' is not defined
    Fix as
    import asyncio

5. NameError: name 'format_t' is not defined.
    Implement format_t() as
    from datetime import datetime, timezone

    def format_t(timestamp: float) -> str:
return datetime.fromtimestamp(timestamp, tz=timezone.utc).isoformat()
This commit is contained in:
ArrayPD 2025-03-01 15:39:02 -05:00 committed by GitHub
parent eca8c5515d
commit c671d54c6f
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1 changed files with 20 additions and 15 deletions
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35
libs/core/langchain_core/runnables/base.py
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@ -1644,8 +1644,13 @@ class Runnable(Generic[Input, Output], ABC):
.. code-block:: python
from langchain_core.runnables import RunnableLambda
from langchain_core.runnables import RunnableLambda, Runnable
from datetime import datetime, timezone
import time
import asyncio
def format_t(timestamp: float) -> str:
return datetime.fromtimestamp(timestamp, tz=timezone.utc).isoformat()
async def test_runnable(time_to_sleep : int):
print(f"Runnable[{time_to_sleep}s]: starts at {format_t(time.time())}")
@ -1653,12 +1658,12 @@ class Runnable(Generic[Input, Output], ABC):
print(f"Runnable[{time_to_sleep}s]: ends at {format_t(time.time())}")
async def fn_start(run_obj : Runnable):
print(f"on start callback starts at {format_t(time.time())}
print(f"on start callback starts at {format_t(time.time())}")
await asyncio.sleep(3)
print(f"on start callback ends at {format_t(time.time())}")
async def fn_end(run_obj : Runnable):
print(f"on end callback starts at {format_t(time.time())}
print(f"on end callback starts at {format_t(time.time())}")
await asyncio.sleep(2)
print(f"on end callback ends at {format_t(time.time())}")
@ -1671,18 +1676,18 @@ class Runnable(Generic[Input, Output], ABC):
asyncio.run(concurrent_runs())
Result:
on start callback starts at 2024-05-16T14:20:29.637053+00:00
on start callback starts at 2024-05-16T14:20:29.637150+00:00
on start callback ends at 2024-05-16T14:20:32.638305+00:00
on start callback ends at 2024-05-16T14:20:32.638383+00:00
Runnable[3s]: starts at 2024-05-16T14:20:32.638849+00:00
Runnable[5s]: starts at 2024-05-16T14:20:32.638999+00:00
Runnable[3s]: ends at 2024-05-16T14:20:35.640016+00:00
on end callback starts at 2024-05-16T14:20:35.640534+00:00
Runnable[5s]: ends at 2024-05-16T14:20:37.640169+00:00
on end callback starts at 2024-05-16T14:20:37.640574+00:00
on end callback ends at 2024-05-16T14:20:37.640654+00:00
on end callback ends at 2024-05-16T14:20:39.641751+00:00
on start callback starts at 2025-03-01T07:05:22.875378+00:00
on start callback starts at 2025-03-01T07:05:22.875495+00:00
on start callback ends at 2025-03-01T07:05:25.878862+00:00
on start callback ends at 2025-03-01T07:05:25.878947+00:00
Runnable[2s]: starts at 2025-03-01T07:05:25.879392+00:00
Runnable[3s]: starts at 2025-03-01T07:05:25.879804+00:00
Runnable[2s]: ends at 2025-03-01T07:05:27.881998+00:00
on end callback starts at 2025-03-01T07:05:27.882360+00:00
Runnable[3s]: ends at 2025-03-01T07:05:28.881737+00:00
on end callback starts at 2025-03-01T07:05:28.882428+00:00
on end callback ends at 2025-03-01T07:05:29.883893+00:00
on end callback ends at 2025-03-01T07:05:30.884831+00:00
"""
from langchain_core.tracers.root_listeners import AsyncRootListenersTracer