Python

It is recommended to properly indent docstrings for readability.

Use of insecure MD2, MD4, MD5, or SHA1 hash functions should be avoided. Using more secure algorithms like SHA256 or SHA512.

Use of insecure cipher or cipher mode. Replace with a known secure cipher such as AES.

Use of insecure cipher or cipher mode. Replace with a known secure cipher such as AES.

Having a nullable many-to-many field doesn't do anything. The declaration of a ManyToManyField causes the creation of an intermediate table to hold the relationship. Each relation between the two tables is an entry in this new table. By definition, having no relations between two tables would mean no entries in this table. There's no use of null. Consider removing null=True from this property.

Cipher used is not secure. It is recommended to replace with a known secure cipher such as AES.

In order to conform to the object model, classes that define their own equality method should also define their own hash method, or be unhashable. If the hash method is not defined then the hash of the super class is used. This is unlikely to result in the expected behavior. A class can be made unhashable by setting its __hash__ attribute to None.

Use of insecure cipher mode such as ECB is not recommended for use in cryptographic protocols at all. In case of ECB, it encrypts identical plaintext blocks into identical ciphertext blocks; and does not hide data patterns well. In some senses, it doesn't provide serious message confidentiality.

D2, MD4, MD5, SHA1 signature algorithms are known to be vulnerable to collision attacks. Attackers can exploit this to generate another certificate with the same digital signature, allowing them to masquerade as the affected service.

There should be only one space after the , character.

A continuation line is indented farther than it should be for a hanging indent.

While returning NotImplemented would be fine, raising it doesn't work and will cause a TypeError because NotImplemented is not an exception type.

Using range(len(...)) is not pythonic. Python does not have not index-based loops. Instead, it uses collection iterators. Python has a built-in method enumerate which adds a counter to an iterable.

There’s no need to calculate length of an iterable in order to fetch the last element of the iterable. You can provide a negative index -1 to it directly in orger to get the last element. In this way, you don't have to iterate over the sequence using len to get the last index when your purpose is only to get the last element.

Calculating the length of the hypotenuse using the standard formula c = sqrt(a**2 + b**2) may lead to overflow if the two other sides are both very large. Even though c will not be much bigger than max(a, b), either a**2 or b**2 (or both) could be. Thus, the calculation could overflow, even though the result is well within representable range. It is recommended to use the built-in function hypot(a,b) from the math library.

Encountered a TypeError while assignment. Please see the message occurrence.

Type of __all__ must be sequence string. See the issue message for more details

The boolean expression with redundant pre-python 2.5 ternary syntax is used and can be simplified for better readability. Please look at the issue text for suggestion.