How to validate structure (or schema) of dictionary in Python?

Question

I have a dictionary with config info:

my_conf = {     'version': 1,      'info': {         'conf_one': 2.5,         'conf_two': 'foo',         'conf_three': False,         'optional_conf': 'bar'     } } 

I want to check if the dictionary follows the structure I need.

I'm looking for something like this:

conf_structure = {     'version': int,      'info': {         'conf_one': float,         'conf_two': str,         'conf_three': bool     } }  is_ok = check_structure(conf_structure, my_conf) 

Is there any solution done to this problem or any library that could make implementing check_structure more easy?

Answer 1

You may use schema (PyPi Link)

schema is a library for validating Python data structures, such as those obtained from config-files, forms, external services or command-line parsing, converted from JSON/YAML (or something else) to Python data-types.

from schema import Schema, And, Use, Optional, SchemaError  def check(conf_schema, conf):     try:         conf_schema.validate(conf)         return True     except SchemaError:         return False  conf_schema = Schema({     'version': And(Use(int)),     'info': {         'conf_one': And(Use(float)),         'conf_two': And(Use(str)),         'conf_three': And(Use(bool)),         Optional('optional_conf'): And(Use(str))     } })  conf = {     'version': 1,     'info': {         'conf_one': 2.5,         'conf_two': 'foo',         'conf_three': False,         'optional_conf': 'bar'     } }  print(check(conf_schema, conf))