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Hands-On Blockchain for Python Developers

You're reading from   Hands-On Blockchain for Python Developers Gain blockchain programming skills to build decentralized applications using Python

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Product type Paperback
Published in Feb 2019
Publisher Packt
ISBN-13 9781788627856
Length 450 pages
Edition 1st Edition
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Author (1):
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Arjuna Sky Kok Arjuna Sky Kok
Author Profile Icon Arjuna Sky Kok
Arjuna Sky Kok
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Toc

Table of Contents (19) Chapters Close

Preface 1. Section 1: Blockchain and Smart Contracts
2. Introduction to Blockchain Programming FREE CHAPTER 3. Smart Contract Fundamentals 4. Implementing Smart Contracts Using Vyper 5. Section 2: Web3 and Populus
6. Interacting with Smart Contracts Using Web3 7. Populus Development Framework 8. Building a Practical Decentralized Application 9. Section 3: Frontend Decentralized Applications
10. Frontend Decentralized Application 11. Section 4: Cryptocurrency and Wallets
12. Creating Token in Ethereum 13. Cryptocurrency Wallet 14. Section 5: Decentralized Filesystem
15. InterPlanetary - A Brave New File System 16. Using ipfsapi to Interact with IPFS 17. Implementing a Decentralized Application Using IPFS 18. Other Books You May Enjoy

Content hashing

In the IPFS quick start documentation (https://docs.ipfs.io/introduction/usage), the first thing that they teach you is to download the cute cat picture. Use the following code to do this:

$ ipfs cat /ipfs/QmW2WQi7j6c7UgJTarActp7tDNikE4B2qXtFCfLPdsgaTQ/cat.jpg >cat.jpg
$ eog cat.jpg

When you run the preceding code, the cat picture will be downloaded and you will get the following as output:

eog is an image viewer in Ubuntu.

To respect the tradition, let's create a Python script to download the preceding image programmatically with Python and name the script download_cute_cat_picture.py:

import ipfsapi


c = ipfsapi.connect()
cute_cat_picture = 'QmW2WQi7j6c7UgJTarActp7tDNikE4B2qXtFCfLPdsgaTQ/cat.jpg'
c.get(cute_cat_picture)

After executing this script, the image will be named cat.jpg in your directory.

As you may have noticed, there is a cat.jpg filename...

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