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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?

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  • 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, 2017 at 0:11
  • Thanks for the input, carver. I already ran this in a venv...no dice.
    – Gregory DiPrisco
    Oct 6, 2017 at 3:36
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    What do you see in your console in response to pip install -U web3?
    – carver
    Dec 29, 2017 at 23:24

1 Answer 1

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From the terminal, install Web3.py using pip with the following command:

pip install web3

To use the web3 library you will need to instantiate a Web3 object:

>>> from web3 import Web3, HTTPProvider, IPCProvider
>>> web3 = Web3(HTTPProvider('http://localhost:8545'))

>>> web3.eth.blockNumber
4000000

or for an IPC based connection

>>> web3 = Web3(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.

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