Situation: I want to start a blockchain node

Action: sudo python blockchain.py -p 5000

Result:

Traceback (most recent call last):
  File "blockchain.py", line 33, in <module>
    from urllib.parse import urlparse
ImportError: No module named parse

Attemption:
pip install parse(install success, does not solve problem)
pip install urllib(No matching distribution found for urllib)
pip install urlparse(No matching distribution found for urlparse)

Solution:
In blockchain.py, change
from urllib.parse import urlparse
to
from urlparse import urlparse

Could you please tell me the reason why we cannot import urlparse from urllib.parse?

And I wonder if we can only execute all the command like create node, start the blockchain client under root? As it notify me "cannot import Crypto" when I type python blockchain_client.py without sudo.

Thanks.

Hi Adil,

Thanks for your codes! I learned a lot from it!
I have a small question. How to generate the sender and receiver address for the url such as http://127.0.0.1:5000?

Thanks

xwei

Hello, it doesn't work when executing the follow command in Windows 10+python3.6:

python blockchain.py -p 5000

The error information is:

ModuleNotFoundError: No module named 'Crypto'

Then, after installed crypto

pip install crypto

Another problem appears:

ModuleNotFoundError: No module named 'Crypto.Random'

Any pip package needed to install before ? If so, would you please append the requirement file ?
Thanks for your sharing!

How a new account gets coins? The miner should bind an account and transfer the mining rewards to this account. Isn't it?

hi all
i run blockchain.py on 3 or 4 different port
in configure tab in every blockchain node i added another node addreses
but when i mine a block in for example node 1 when i press refresh button in every blockchain node Nothing happen and nodes are not sync

in addition i use win10 and i run it under Spyder
in spyder i have 4 console that every blockchain.py run at that console
and every thing work except node synnc

Hey I want to change the confirmation_amount = amount * 0.1

But I still have a lot of error and can't figure it out

$ python blockchain_client.py
Traceback (most recent call last):
File "blockchain_client.py", line 22, in
import Crypto
ImportError: No module named Crypto

Hi there I am new to blockchain development and learning it with your codes your codes are very useful in understanding blockchain but there one issue that i am not able to transact the amount in the make transactions page the success modal does not appear can anybody please help me with that

Hi, on client side after print i have:
OrderedDict([('value', 1), ('sender_address', '30819f300d06092a864886f70d010101050003818d0030818902818100b5ee6802cd965cc6dae7f58e4ead61178f63435151bd2b828a04c2e67643161ecc855ddab5af5efa36b174edfa0a9b585ffcd989edf8255b8b2d92881a161b767129a742204d17e7df3eb51fc7e10887ad9e8ca519137e9fb3ddb1ca2e698a81784467dc9944b7e9688de552ea179e70612674d51c8decb9762fcb71f2fd4f950203010001'), ('recipient_address', '30819f300d06092a864886f70d010101050003818d0030818902818100b5ee6802cd965cc6dae7f58e4ead61178f63435151bd2b828a04c2e67643161ecc855ddab5af5efa36b174edfa0a9b585ffcd989edf8255b8b2d92881a161b767129a742204d17e7df3eb51fc7e10887ad9e8ca519137e9fb3ddb1ca2e698a81784467dc9944b7e9688de552ea179e70612674d51c8decb9762fcb71f2fd4f950203010001')])
on bitcoin side:
OrderedDict([('sender_address', '30819f300d06092a864886f70d010101050003818d0030818902818100b5ee6802cd965cc6dae7f58e4ead61178f63435151bd2b828a04c2e67643161ecc855ddab5af5efa36b174edfa0a9b585ffcd989edf8255b8b2d92881a161b767129a742204d17e7df3eb51fc7e10887ad9e8ca519137e9fb3ddb1ca2e698a81784467dc9944b7e9688de552ea179e70612674d51c8decb9762fcb71f2fd4f950203010001'), ('value', 1), ('recipient_address', '30819f300d06092a864886f70d010101050003818d0030818902818100b5ee6802cd965cc6dae7f58e4ead61178f63435151bd2b828a04c2e67643161ecc855ddab5af5efa36b174edfa0a9b585ffcd989edf8255b8b2d92881a161b767129a742204d17e7df3eb51fc7e10887ad9e8ca519137e9fb3ddb1ca2e698a81784467dc9944b7e9688de552ea179e70612674d51c8decb9762fcb71f2fd4f950203010001')])

as you can see dict value equals, but strings different as result verify return false.

Hi, thank you for tutorial, how can i understand according implementation you can add nodes only in visible network?

can you please tell me ,what is the issue behind that .when i enter node address it was as it is.... nothing was changed