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Hands-On Blockchain for Python Developers

You're reading from  Hands-On Blockchain for Python Developers

Product type Book
Published in Feb 2019
Publisher Packt
ISBN-13 9781788627856
Pages 450 pages
Edition 1st Edition
Languages
Concepts
Author (1):
Arjuna Sky Kok Arjuna Sky Kok
Profile icon Arjuna Sky Kok

Table of Contents (19) Chapters

Preface 1. Section 1: Blockchain and Smart Contracts
2. Introduction to Blockchain Programming 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

Other tricks

Vyper is not as liberal as Python; there are some limitations that you must live with. To overcome these limitations, you need to make peace with them or you need to unlock your creativity. Here are some hints as to how to do this.

The first limitation is that the array must have a fixed size. In Python, you might be very accustomed to having a list that you can extend on your whim, as shown in the following code:

>>> flexible_list = []
>>> flexible_list.append('bitcoin')
>>> flexible_list.append('ethereum')
>>> flexible_list
['bitcoin', 'ethereum']

There is no such thing in Vyper. You have to declare how big your array is. Then you must use an integer variable to track how many items you have inserted into this fixed-size array. You used this strategy in the Donation smart contract.

If you are...

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