pre-commit configuration for python projects

.pre-commit-config.yaml

repos:
-   repo: https://github.com/ambv/black
    rev: 18.6b2
    hooks:
    -   id: black
        args: [--skip-string-normalization]
        language_version: python3.6
-   repo: https://github.com/pre-commit/pre-commit-hooks
    rev: v1.3.0
    hooks:
    -   id: trailing-whitespace
    -   id: end-of-file-fixer
    -   id: double-quote-string-fixer
    -   id: detect-aws-credentials
    -   id: detect-private-key
    -   id: check-merge-conflict
    -   id: check-ast
    -   id: flake8
-   repo: local
    hooks:
    -   id: pytest
        name: pytest
        entry: tox
        language: python