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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!')