i am getting rinkeby error while running my deploy_and_create.py in brownie python

Question

PS E:\NFT-DEMO> brownie run scripts/deploy_and_create.py --network rinkeby INFO: Could not find files for the given pattern(s). Brownie v1.16.4 - Python development framework for Ethereum

NftDemoProject is the active project. File "C:\Users\scs\AppData\Local\Programs\Python\Python310\lib\site-packages\brownie_cli_main_.py", line 64, in main importlib.import_module(f"brownie._cli.{cmd}").main() network.connect(CONFIG.argv["network"]) File "C:\Users\scs\AppData\Local\Programs\Python\Python310\lib\site-packages\brownie\network\main.py", line 40, in connect web3.connect(host, active.get("timeout", 30)) File "C:\Users\scs\AppData\Local\Programs\Python\Python310\lib\site-packages\brownie\network\web3.py", line 52, in connect uri = _expand_environment_vars(uri) File "C:\Users\scs\AppData\Local\Programs\Python\Python310\lib\site-packages\brownie\network\web3.py", line 183, in _expand_environment_vars raise ValueError(f"Unable to expand environment variable in host setting: '{uri}'") ValueError: Unable to expand environment variable in host setting: 'https://rinkeby.infura.io/v3/$WEB3_INFURA_PROJECT_ID'

Answer 1

This states that you have not set the environment variable. Using brownie you can easily do that by creating a file named .env inside the brownie project and there you can export your variable as

export WEB3_INFURA_PROJECT_ID=XXXXXXXXXXXXXX

Now brownie will place this variable to get the infura instance

Answer 2

Unable to expand environment variable in host setting: 'https://rinkeby.infura.io/v3/$WEB3_INFURA_PROJECT_ID'

This is your error.

It says you have not set the environment variable.

You must set the environment variable.