src/google/appengine/datastore/cloud_datastore_validator.py [115:166]:
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    ])



class ValidationError(Exception):
  """Raised when validation fails."""
  pass


def _assert_condition(condition, message):
  """Asserts a validation condition and raises an error if it's not met.

  Args:
    condition: (boolean) condition to enforce
    message: error message

  Raises:
    ValidationError: if condition is not met
  """
  if not condition:
    raise ValidationError(message)


def _assert_initialized(pb):
  """Asserts that a protocol buffer is initialized.

  Args:
    pb: a protocol buffer

  Raises:
    ValidationError: if protocol buffer is not initialized
  """
  errors = []
  if not pb.IsInitialized(errors):
    _assert_condition(False, '\n\t'.join(errors))


def _assert_valid_utf8(string, desc):
  """Asserts that a string is valid UTF8.

  Args:
    string: string to check
    desc: description of the string (used in error message)

  Raises:
    ValidationError: if the string is not valid UTF8
  """
  _assert_condition(datastore_pbs.is_valid_utf8(string),
                    'The %s is not valid UTF-8.' % desc)


def _assert_string_not_empty(string, desc):
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src/google/appengine/datastore/datastore_v4_validator.py [127:178]:
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    ])



class ValidationError(Exception):
  """Raised when validation fails."""
  pass


def _assert_condition(condition, message):
  """Asserts a validation condition and raises an error if it's not met.

  Args:
    condition: (boolean) condition to enforce
    message: error message

  Raises:
    ValidationError: if condition is not met
  """
  if not condition:
    raise ValidationError(message)


def _assert_initialized(pb):
  """Asserts that a protocol buffer is initialized.

  Args:
    pb: a protocol buffer

  Raises:
    ValidationError: if protocol buffer is not initialized
  """
  errors = []
  if not pb.IsInitialized(errors):
    _assert_condition(False, '\n\t'.join(errors))


def _assert_valid_utf8(string, desc):
  """Asserts that a string is valid UTF8.

  Args:
    string: string to check
    desc: description of the string (used in error message)

  Raises:
    ValidationError: if the string is not valid UTF8
  """
  _assert_condition(datastore_pbs.is_valid_utf8(string),
                    'The %s is not valid UTF-8.' % desc)


def _assert_string_not_empty(string, desc):
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