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item_24_example_09.py
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executable file
·41 lines (33 loc) · 1.19 KB
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#!/usr/bin/env PYTHONHASHSEED=1234 python3
# Copyright 2014-2019 Brett Slatkin, Pearson Education Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# Example 9
# Check types in this file with: python -m mypy <path>
from datetime import datetime
from time import sleep
from typing import Optional
def log_typed(message: str,
when: Optional[datetime]=None) -> None:
"""Log a message with a timestamp.
Args:
message: Message to print.
when: datetime of when the message occurred.
Defaults to the present time.
"""
if when is None:
when = datetime.now()
print(f'{when}: {message}')
log_typed('Hi there!')
sleep(0.1)
log_typed('Hello again!')