I've repeatedly installed web3 via pip on an ubuntu OS (17.04, running on a DigitalOcean droplet) but for some reason when I attempt to run "from web3 import Web3" I get this response:

ModuleNotFoundError: No module named 'web3'

I think it has to do with pip because I've had trouble installing other modules (eth-testrpc). Any advice?

  • If it's a pip problem with other libraries too, then you probably have an environment setup issue. You can work in a new virtual environment to sidestep it: digitalocean.com/community/tutorials/… The upside is that you should really be working in python 3 anyway for web3.py – carver Oct 6 '17 at 0:11
  • Thanks for the input, carver. I already ran this in a venv...no dice. – Gregory DiPrisco Oct 6 '17 at 3:36
  • 1
    What do you see in your console in response to pip install -U web3? – carver Dec 29 '17 at 23:24

Web3.py can be installed using pip as follows. $ pip install web3

In terminal, it installs web3 in MacOS automatically.

To use the web3 library you will need to nstantiate an instance of the Web3 object.

from web3 import Web3, HTTPProvider, IPCProvider

Note that you should create only one RPCProvider per

process, as it recycles underlying TCP/IP network connections between

your process and Ethereum node

web3 = Web3(HTTPProvider('http://localhost:8545'))

or for an IPC based connection

web3 = Web3(IPCProvider()) web3.eth.blockNumber 4000000

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