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Python interpreter conflict causes elusive MCP import error

By PulseAugur Editorial · [1 sources] ·

A developer encountered a persistent ModuleNotFoundError for the MCP package, despite pip indicating it was installed. The issue stemmed from two different Python interpreters sharing the same PATH, with pip associated with Python 3.13 while the script ran under Python 3.11. This meant the installed MCP package was inaccessible to the script's interpreter. Further investigation revealed that the interpreter which could access MCP had installed version 2.3.0, which contained breaking API changes that the script was not designed to handle, despite a requirements.txt file attempting to pin an earlier version. AI

RANK_REASON The article describes a specific technical problem and its resolution related to software development tools and environment configuration.

Read on dev.to — MCP tag →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

Python interpreter conflict causes elusive MCP import error

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  1. dev.to — MCP tag TIER_1 English(EN) · Enjoy Kumawat ·

    pip Said mcp Was Installed, and My Script Still Couldn't Import It

    <p>A couple of weeks ago I wrote up a workaround for a weird failure in this repo's MCP server: <code>server.py</code> opens with <code>from mcp.server.fastmcp import FastMCP</code>, that import raised a bare <code>ModuleNotFoundError</code> in the sandbox this repo's scheduled t…

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