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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 8

# Check types in this file with: python -m mypy <path>

class Counter:

def __init__(self) -> None:

self.value: int = 0 # Field / variable annotation

def add(self, offset: int) -> None:

value += offset # Oops: forgot "self."

def get(self) -> int:

self.value # Oops: forgot "return"

counter = Counter()

counter.add(5)

counter.add(3)

assert counter.get() == 8