CustomPythonDecorators
These are custom Python decorators I wrote to restrict method arguments to a specific type. If you pass an argument other than what the decorator allows, it will raise a TypeError exception. These decorators also ensure that you are calling the decorator on an instance method of a class. I also wrote other decorators to encrypt/decrypt strings passed to instance methods.
Examples:
accepts decorators
class TestAcceptsClass(object):
# This instance method will raise an exception
# if an argument other than boolean is passed.
@accepts.boolean
def _boolean(self,_boolean_):
print('boolean => '+str(_boolean_))
# This instance method will raise an exception
# if an argument other than integer is passed.
@accepts.integer
def _integer(self,_integer_):
print('integer => '+str(_integer_))
# This instance method will raise an exception
# if an argument other than string is passed.
@accepts.string
def _string(self,_string_):
print('string => '+str(_string_))
# This instance method will raise an exception
# if an argument other than dict is passed.
@accepts.dictionary
def _dictionary(self,_dictionary_):
print('dictionary => '+str(_dictionary_))
# This instance method will raise an exception
# if an argument other than list is passed.
@accepts.list
def _list(self,_list_):
print('list => '+str(_list_))
# This instance method will raise an exception
# if an argument other than tuple is passed.
@accepts.tuple
def _tuple(self,_tuple_):
print('tuple => '+str(_tuple_))
if __name__ == '__main__':
# Our test class
test = TestAcceptsClass()
# The following examples are ways that the custom
# decorators can be used.
test._integer(1)
test._integer(1,2)
test._boolean(True)
test._boolean(True,False)
test._list(['1','2','3'])
test._list(['1','2','3'],['4','5','6'])
test._tuple(('1','2','3'),)
test._tuple(('1','2','3'),('4','5','6'))
test._string('test string')
test._string('test string1','test string2')
test._dictionary(
{'one': '1','two': '2','three': '3'},
{'four': '4','five': '5','six': '6'}
)
test._dictionary({'one': '1','two': '2','three': '3'})
# The following test cases will fail and will raise a type exception!
test._integer('1')
test._integer('1','2')
test._boolean(1)
test._boolean('True','False',1)
test._list(('1','2','3'))
test._list(('1','2','3'),('4','5','6'))
test._tuple(['1','2','3'],)
test._tuple(['1','2','3'],['4','5','6'])
test._string(True)
test._string(True,False)
# The following examples will fail and will raise a SyntaxError
# and complain about the method not being an instance of a class.
@accepts.integer
def _integer(_integer_):
print('integer: '+str(_integer_))
_integer(1)
encryption decorators
class TestStringClass(object):
@string.encrypt
def encrypt(self,string):
return string
@string.decrypt
def decrypt(self,string):
return string
if __name__ == '__main__':
# This will work
test = TestStringClass()
encrypted_text = test.encrypt('This is an encrypted string')
print test.decrypt(encrypted_text)
# This will not work
@string.encrypt
def test_string_method(string):
string
test_string_method('This is a test') ^^ Remove newlines in between method declarations if using the python shell/interpretter and are having problems!