code: def check(cls, config, strict=False):  # type: (dict, bool) -> Dict[str, List[str]]
          
          result = {"errors": [], "warnings": []}
          # Schema validation errors
          validation_errors = validate_object(config, "poetry-schema")
  
          result["errors"] += validation_errors
  
          if strict:
              # If strict, check the file more thoroughly
  
              # Checking license
              license = config.get("license")
              if license:
                  try:
                      license_by_id(license)
                  except ValueError:
                      result["errors"].append("{} is not a valid license".format(license))
  
              if "dependencies" in config:
                  python_versions = config["dependencies"]["python"]
                  if python_versions == "*":
                      result["warnings"].append(
                          "A wildcard Python dependency is ambiguous. "
                          "Consider specifying a more explicit one."
                      )
  
              # Checking for scripts with extras
              if "scripts" in config:
                  scripts = config["scripts"]
                  for name, script in scripts.items():
                      if not isinstance(script, dict):
                          continue
  
                      extras = script["extras"]
                      for extra in extras:
                          if extra not in config["extras"]:
                              result["errors"].append(
                                  'Script "{}" requires extra "{}" which is not defined.'.format(
                                      name, extra
                                  )
                              )
  
          return result
docs: Checks the validity of a configuration