https://github.com/mcauser/micropython-mcp23017

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mcp = mcp23017.MCP23017(i2c, 0x20)
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AttributeError: 'module' object has no attribute 'MPC23017'
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from machine import Pin, I2C
import mcp23017
i2c = I2C(scl=Pin(4), sda=Pin(0)) # On the D1 mini, D4=GPIO2, D3=GPIO0
mcp = mcp23017.MCP23017(i2c, 0x20)