2017-12-18-213425.ipynb

Kernel: Python 3 (Anaconda)

import hashlib

class chunk:
    def __init__(self, index, data, previous):
        self.index=index
        self.data=data
        self.previous=previous
        self.hash=self.hash()
        
        
def hash(self):
        x=hashlib.sha256()
        x.new(str(self.index)+str(self.data)+str(self.previous))
        return w.hexdigest()

    def rootblock():
        return chunk(0, 'Root', '0')
    
    def next(previousblock):
        if len(currentidx) ==2:
            currentidx = previousblock.index + 1
            currentdata= str(currentidx)
            currenthash=previousblock.hash
        else:
             currentdata= str(currentidx)
                
        return Block(currentidx, currentdata, currenthash)
    
    blockchain = [rootblock()]
    previousblock = blockchain[0]
    
    def blocks(l, L):
        for i in range (0, len(l), L):
            yield l[i:i +L]
            
    def merkel_tree():
        part = []
        for i in blocks(l,2):
            newblock=next(previousblock)
            blockchain.append(newblock)
            previousblock = newblock

---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
<ipython-input-2-10b9bad4efd2> in <module>()
      1 import hashlib
      2 
----> 3 class chunk:
      4 
      5     def __init__(self, index, data, previous):
<ipython-input-2-10b9bad4efd2> in chunk()
     28         return Block(currentidx, currentdata, currenthash)
     29 
---> 30     blockchain = [rootblock()]
     31     previousblock = blockchain[0]
     32 
<ipython-input-2-10b9bad4efd2> in rootblock()
     16 
     17     def rootblock():
---> 18         return chunk(0, 'Root', '0')
     19 
     20     def next(previousblock):
NameError: name 'chunk' is not defined

class chunk:
    def __init__(self, index, data, previous):
        self.index=index
        self.data=data
        self.previous=previous
        self.hash=self.hash()