TryteString.random() should use cls.LEN as its default length, when available

[todofixthis]

When calling a class' random() method, the length parameter should only be required if the class has no LEN attribute.

Example:

>>> from iota import Address
>>> Address.random()

# Expected Result
Address(b'... 81 random trytes ...')

# Actual Result
TypeError: random() missing 1 required positional argument: 'length'

[marko-k0]

Does this mean that every class that is a subclass of TryteString and has LEN class attribute needs to override random class method:

    @classmethod
    def random(cls, length=LEN):
        return super(Address, cls).random(length)

Is more elegant solution possible - changes only in the TryteString class?

[todofixthis]

Hey @redondo-mk it should automatically use cls.LEN when length is None; see https://github.com/iotaledger/iota.lib.py/pull/167/files#diff-d6aa393b4abd731eaf02e44ac1dc7d5aR64

[xie4991]

You can try this：Address.random().choice(81 random trytes )
It may be solved by giving a limited range later.