Method parse

code-ch08/tx.py:105–127

Takes a byte stream and parses the transaction at the start return a Tx object

(cls, s, testnet=False)

    @classmethod
    def parse(cls, s, testnet=False):
        '''Takes a byte stream and parses the transaction at the start
        return a Tx object
        '''
        # s.read(n) will return n bytes
        # version is an integer in 4 bytes, little-endian
        version = little_endian_to_int(s.read(4))
        # num_inputs is a varint, use read_varint(s)
        num_inputs = read_varint(s)
        # parse num_inputs number of TxIns
        inputs = []
        for _ in range(num_inputs):
            inputs.append(TxIn.parse(s))
        # num_outputs is a varint, use read_varint(s)
        num_outputs = read_varint(s)
        # parse num_outputs number of TxOuts
        outputs = []
        for _ in range(num_outputs):
            outputs.append(TxOut.parse(s))
        # locktime is an integer in 4 bytes, little-endian
        locktime = little_endian_to_int(s.read(4))
        # return an instance of the class (see __init__ for args)
        return cls(version, inputs, outputs, locktime, testnet=testnet)

    def serialize(self):
        '''Returns the byte serialization of the transaction'''