Getting an error In spyder while doing Sample Program for Block Chain.

[Ashish Yadav]

Below is the python code which i am trying to run on Spyder, but getting an error.

I have downloaded that code from Internet .  Please help me .

Error- TypeError: encoding without a string argument

import hashlib as hasher

class Block:

  def __init__(self, index, timestamp, data, previous_hash):

    self.index = index

    self.timestamp = timestamp

    self.data = data

    self.previous_hash = previous_hash

    self.hash = self.hash_block()

  

  def hash_block(self):

    sha = hasher.sha256()

    sha.update(str(self.index) + 

               str(self.timestamp) + 

               str(self.data) + 

               str(self.previous_hash))

#    return hashlib.sha256(str(msg).encode('utf-8')).hexdigest()

    return sha.hexdigest()

import datetime as date

def create_genesis_block():

  # Manually construct a block with

  # index zero and arbitrary previous hash

  return Block(0, date.datetime.now(), "Genesis Block", "0")

def next_block(last_block):

  this_index = last_block.index + 1

  this_timestamp = date.datetime.now()

  this_data = "Hey! I'm block " + str(this_index)

  this_hash = last_block.hash

  return Block(this_index, this_timestamp, this_data, this_hash)

# Create the blockchain and add the genesis block

blockchain = [create_genesis_block()]

previous_block = blockchain[0]

# How many blocks should we add to the chain

# after the genesis block

num_of_blocks_to_add = 5

# Add blocks to the chain

for i in range(0, num_of_blocks_to_add):

  block_to_add = next_block(previous_block)

  blockchain.append(block_to_add)

  previous_block = block_to_add

  # Tell everyone about it!

  print ("Block #{} has been added to the blockchain!".format(block_to_add.index))

  print ("Hash: {}\n".format(block_to_add.hash))

  

Thanks

Ashish

[Russel Rehmund]

Ran fine for me in pycharm.  I just pasted your code and ran in the console without issue.

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Russel Rehmund

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www.the3daddict.com

[Ashish Yadav]

I am trying this in Spyder and getting an issue .

I do not know why ? please help me .

[Ravi Jagannadhan]

Paste your code in notepad first, and look for any out of place ascii characters.

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[Ashish Yadav]

I have checked that but still getting the same error.

[Justin Israel]

On Wed, Dec 20, 2017 at 8:57 AM Ashish Yadav <ashishs...@gmail.com> wrote:

I have checked that but still getting the same error.

Are you running this under Python3? If so, it would be working in Python 2.x but complaining in Python3 because of your modification on line 16.

Change this:

    sha.update(str(self.index) + 

               str(self.timestamp) + 

               str(self.data) + 

               str(self.previous_hash))

To this:

    sha.update((str(self.index) + 

               str(self.timestamp) + 

               str(self.data) + 

               str(self.previous_hash)).encode('utf-8'))

 

Justin

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