get pool length

pool_length.py

from web3 import Web3

# https://web3py.readthedocs.io/en/stable/quickstart.html
# https://docs.matic.network/docs/develop/network-details/network/
w3 = Web3(Web3.HTTPProvider("https://rpc-mainnet.matic.network"))

print(w3.isConnected())

print(w3.eth.block_number)

# https://polygonscan.com/address/0x0d17C30aFBD4d29EEF3639c7B1F009Fd6C9f1F72
masterchef_address = "0x0d17C30aFBD4d29EEF3639c7B1F009Fd6C9f1F72"

# copy from Contract ABI section in
# https://polygonscan.com/address/0x0d17C30aFBD4d29EEF3639c7B1F009Fd6C9f1F72
masterchef_abi = open("masterchef_abi.json").read()

# https://web3py.readthedocs.io/en/stable/examples.html#interacting-with-existing-contracts
chef = w3.eth.contract(masterchef_address, abi=masterchef_abi)
n_pools = chef.functions.poolLength().call()

print("pool length", n_pools)