[Python] fix python required property check and validation for optional properties

modules/swagger-codegen/src/main/resources/python/model.mustache

@@ -88,37 +88,37 @@ class {{classname}}(object):
 {{/isContainer}}
 {{/isEnum}}
 {{^isEnum}}
-{{#hasValidation}}
 {{#required}}
         if {{name}} is None:
             raise ValueError("Invalid value for `{{name}}`, must not be `None`")
 {{/required}}
+{{#hasValidation}}
 {{#maxLength}}
-        if len({{name}}) > {{maxLength}}:
+        if {{name}} is not None and len({{name}}) > {{maxLength}}:
             raise ValueError("Invalid value for `{{name}}`, length must be less than or equal to `{{maxLength}}`")
 {{/maxLength}}
 {{#minLength}}
-        if len({{name}}) < {{minLength}}:
+        if {{name}} is not None and len({{name}}) < {{minLength}}:
             raise ValueError("Invalid value for `{{name}}`, length must be greater than or equal to `{{minLength}}`")
 {{/minLength}}
 {{#maximum}}
-        if {{name}} >{{#exclusiveMaximum}}={{/exclusiveMaximum}} {{maximum}}:
+        if {{name}} is not None and {{name}} >{{#exclusiveMaximum}}={{/exclusiveMaximum}} {{maximum}}:
             raise ValueError("Invalid value for `{{name}}`, must be a value less than {{^exclusiveMaximum}}or equal to {{/exclusiveMaximum}}`{{maximum}}`")
 {{/maximum}}
 {{#minimum}}
-        if {{name}} <{{#exclusiveMinimum}}={{/exclusiveMinimum}} {{minimum}}:
+        if {{name}} is not None and {{name}} <{{#exclusiveMinimum}}={{/exclusiveMinimum}} {{minimum}}:
             raise ValueError("Invalid value for `{{name}}`, must be a value greater than {{^exclusiveMinimum}}or equal to {{/exclusiveMinimum}}`{{minimum}}`")
 {{/minimum}}
 {{#pattern}}
-        if not re.search('{{{vendorExtensions.x-regex}}}', {{name}}{{#vendorExtensions.x-modifiers}}{{#-first}}, flags={{/-first}}re.{{.}}{{^-last}} | {{/-last}}{{/vendorExtensions.x-modifiers}}):
+        if {{name}} is not None and not re.search('{{{vendorExtensions.x-regex}}}', {{name}}{{#vendorExtensions.x-modifiers}}{{#-first}}, flags={{/-first}}re.{{.}}{{^-last}} | {{/-last}}{{/vendorExtensions.x-modifiers}}):
             raise ValueError("Invalid value for `{{name}}`, must be a follow pattern or equal to `{{{pattern}}}`")
 {{/pattern}}
 {{#maxItems}}
-        if len({{name}}) > {{maxItems}}:
+        if {{name}} is not None and len({{name}}) > {{maxItems}}:
             raise ValueError("Invalid value for `{{name}}`, number of items must be less than or equal to `{{maxItems}}`")
 {{/maxItems}}
 {{#minItems}}
-        if len({{name}}) < {{minItems}}:
+        if {{name}} is not None and len({{name}}) < {{minItems}}:
             raise ValueError("Invalid value for `{{name}}`, number of items must be greater than or equal to `{{minItems}}`")
 {{/minItems}}
 {{/hasValidation}}

samples/client/petstore/python/petstore_api/models/animal.py

@@ -75,6 +75,8 @@ def class_name(self, class_name):
         :param class_name: The class_name of this Animal.
         :type: str
         """
+        if class_name is None:
+            raise ValueError("Invalid value for `class_name`, must not be `None`")
 
         self._class_name = class_name
 

samples/client/petstore/python/petstore_api/models/cat.py

@@ -78,6 +78,8 @@ def class_name(self, class_name):
         :param class_name: The class_name of this Cat.
         :type: str
         """
+        if class_name is None:
+            raise ValueError("Invalid value for `class_name`, must not be `None`")
 
         self._class_name = class_name
 

samples/client/petstore/python/petstore_api/models/dog.py

@@ -78,6 +78,8 @@ def class_name(self, class_name):
         :param class_name: The class_name of this Dog.
         :type: str
         """
+        if class_name is None:
+            raise ValueError("Invalid value for `class_name`, must not be `None`")
 
         self._class_name = class_name
 

samples/client/petstore/python/petstore_api/models/format_test.py

@@ -108,9 +108,9 @@ def integer(self, integer):
         :param integer: The integer of this FormatTest.
         :type: int
         """
-        if integer > 100.0:
+        if integer is not None and integer > 100.0:
             raise ValueError("Invalid value for `integer`, must be a value less than or equal to `100.0`")
-        if integer < 10.0:
+        if integer is not None and integer < 10.0:
             raise ValueError("Invalid value for `integer`, must be a value greater than or equal to `10.0`")
 
         self._integer = integer
@@ -135,9 +135,9 @@ def int32(self, int32):
         :param int32: The int32 of this FormatTest.
         :type: int
         """
-        if int32 > 200.0:
+        if int32 is not None and int32 > 200.0:
             raise ValueError("Invalid value for `int32`, must be a value less than or equal to `200.0`")
-        if int32 < 20.0:
+        if int32 is not None and int32 < 20.0:
             raise ValueError("Invalid value for `int32`, must be a value greater than or equal to `20.0`")
 
         self._int32 = int32
@@ -185,11 +185,11 @@ def number(self, number):
         :param number: The number of this FormatTest.
         :type: float
         """
-        if not number:
+        if number is None:
             raise ValueError("Invalid value for `number`, must not be `None`")
-        if number > 543.2:
+        if number is not None and number > 543.2:
             raise ValueError("Invalid value for `number`, must be a value less than or equal to `543.2`")
-        if number < 32.1:
+        if number is not None and number < 32.1:
             raise ValueError("Invalid value for `number`, must be a value greater than or equal to `32.1`")
 
         self._number = number
@@ -214,9 +214,9 @@ def float(self, float):
         :param float: The float of this FormatTest.
         :type: float
         """
-        if float > 987.6:
+        if float is not None and float > 987.6:
             raise ValueError("Invalid value for `float`, must be a value less than or equal to `987.6`")
-        if float < 54.3:
+        if float is not None and float < 54.3:
             raise ValueError("Invalid value for `float`, must be a value greater than or equal to `54.3`")
 
         self._float = float
@@ -241,9 +241,9 @@ def double(self, double):
         :param double: The double of this FormatTest.
         :type: float
         """
-        if double > 123.4:
+        if double is not None and double > 123.4:
             raise ValueError("Invalid value for `double`, must be a value less than or equal to `123.4`")
-        if double < 67.8:
+        if double is not None and double < 67.8:
             raise ValueError("Invalid value for `double`, must be a value greater than or equal to `67.8`")
 
         self._double = double
@@ -268,7 +268,7 @@ def string(self, string):
         :param string: The string of this FormatTest.
         :type: str
         """
-        if not re.search('[a-z]', string, flags=re.IGNORECASE):
+        if string is not None and not re.search('[a-z]', string, flags=re.IGNORECASE):
             raise ValueError("Invalid value for `string`, must be a follow pattern or equal to `/[a-z]/i`")
 
         self._string = string
@@ -293,6 +293,8 @@ def byte(self, byte):
         :param byte: The byte of this FormatTest.
         :type: str
         """
+        if byte is None:
+            raise ValueError("Invalid value for `byte`, must not be `None`")
 
         self._byte = byte
 
@@ -339,6 +341,8 @@ def date(self, date):
         :param date: The date of this FormatTest.
         :type: date
         """
+        if date is None:
+            raise ValueError("Invalid value for `date`, must not be `None`")
 
         self._date = date
 
@@ -408,11 +412,11 @@ def password(self, password):
         :param password: The password of this FormatTest.
         :type: str
         """
-        if not password:
+        if password is None:
             raise ValueError("Invalid value for `password`, must not be `None`")
-        if len(password) > 64:
+        if password is not None and len(password) > 64:
             raise ValueError("Invalid value for `password`, length must be less than or equal to `64`")
-        if len(password) < 10:
+        if password is not None and len(password) < 10:
             raise ValueError("Invalid value for `password`, length must be greater than or equal to `10`")
 
         self._password = password

samples/client/petstore/python/petstore_api/models/name.py

@@ -81,6 +81,8 @@ def name(self, name):
         :param name: The name of this Name.
         :type: int
         """
+        if name is None:
+            raise ValueError("Invalid value for `name`, must not be `None`")
 
         self._name = name
 

samples/client/petstore/python/petstore_api/models/pet.py

@@ -133,6 +133,8 @@ def name(self, name):
         :param name: The name of this Pet.
         :type: str
         """
+        if name is None:
+            raise ValueError("Invalid value for `name`, must not be `None`")
 
         self._name = name
 
@@ -156,6 +158,8 @@ def photo_urls(self, photo_urls):
         :param photo_urls: The photo_urls of this Pet.
         :type: list[str]
         """
+        if photo_urls is None:
+            raise ValueError("Invalid value for `photo_urls`, must not be `None`")
 
         self._photo_urls = photo_urls