Stop validate function from being too complex by moving subfunctions out of it

app/schema_validation/__init__.py

@@ -8,27 +8,30 @@ from notifications_utils.recipients import (validate_phone_number, validate_emai
                                             InvalidEmailError)
 
 
-def validate(json_to_validate, schema):
 format_checker = FormatChecker()
 
+
 @format_checker.checks("validate_uuid", raises=Exception)
 def validate_uuid(instance):
     if isinstance(instance, str):
         UUID(instance)
     return True
 
+
 @format_checker.checks('phone_number', raises=InvalidPhoneError)
 def validate_schema_phone_number(instance):
     if isinstance(instance, str):
         validate_phone_number(instance, international=True)
     return True
 
+
 @format_checker.checks('email_address', raises=InvalidEmailError)
 def validate_schema_email_address(instance):
     if isinstance(instance, str):
         validate_email_address(instance)
     return True
 
+
 @format_checker.checks('postage', raises=ValidationError)
 def validate_schema_postage(instance):
     if isinstance(instance, str):
@@ -36,6 +39,7 @@ def validate(json_to_validate, schema):
             raise ValidationError("invalid. It must be either first or second.")
     return True
 
+
 @format_checker.checks('datetime_within_next_day', raises=ValidationError)
 def validate_schema_date_with_hour(instance):
     if isinstance(instance, str):
@@ -50,6 +54,8 @@ def validate(json_to_validate, schema):
                                   "https://en.wikipedia.org/wiki/ISO_8601")
     return True
 
+
+def validate(json_to_validate, schema):
     validator = Draft7Validator(schema, format_checker=format_checker)
     errors = list(validator.iter_errors(json_to_validate))
     if errors.__len__() > 0: