Analyzing the Impact of Coronavirus on the Stock Market using Python, Google Sheets and Google Finance
- Source Code for my blog post: Analyzing the Impact of Coronavirus on the Stock Market using Python, Google Sheets and Google Finance
Source Code for my blog post: A Practical Introduction to Blockchain with Python
License: Other
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
A declarative, efficient, and flexible JavaScript library for building user interfaces.
๐ Vue.js is a progressive, incrementally-adoptable JavaScript framework for building UI on the web.
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
An Open Source Machine Learning Framework for Everyone
The Web framework for perfectionists with deadlines.
A PHP framework for web artisans
Bring data to life with SVG, Canvas and HTML. ๐๐๐
JavaScript (JS) is a lightweight interpreted programming language with first-class functions.
Some thing interesting about web. New door for the world.
A server is a program made to process requests and deliver data to clients.
Machine learning is a way of modeling and interpreting data that allows a piece of software to respond intelligently.
Some thing interesting about visualization, use data art
Some thing interesting about game, make everyone happy.
We are working to build community through open source technology. NB: members must have two-factor auth.
Open source projects and samples from Microsoft.
Google โค๏ธ Open Source for everyone.
Alibaba Open Source for everyone
Data-Driven Documents codes.
China tencent open source team.