[Question] Why ModuleNotFoundError: No module found

[miriam-z]

Example

from fastapi import FastAPI
import pandas.io.sql as sqlio
import psycopg2

app = FastAPI()


@app.get("/")
def read_root():
    return {"Hello": "World"}

uvicorn main:app --reload

Description

import psycopg2

ModuleNotFoundError: No module named 'psycopg2'

Environment

• OS: [e.g. Linux / Windows / macOS]:

• Big Sur 11.4

• FastAPI Version [e.g. 0.3.0]:

To know the FastAPI version use:

python -c "import fastapi; print(fastapi.__version__)"

0.66.0

• Python version:

To know the Python version use:

python --version

3.9.5

Additional context

pip3 list
Package Version

---

aiofiles 0.7.0 fastapi 0.66.0 numpy 1.21.0 pandas 1.2.5 pip 21.1.2 psycopg2 2.9.1 pydantic 1.8.2 rope 0.19.0 setuptools 52.0.0.post20210125 six 1.16.0 starlette 0.14.2 toml 0.10.2 tornado 6.1 traitlets 5.0.5 typing-extensions 3.10.0.0 uvicorn 0.14.0

[ArcLightSlavik]

You need to do pip install psycopg2-binary as well

[miriam-z]

Sorry I didnt make it clear, it is not just psycopg2 but pandas also not found as well

[hail-pas]

Have you use virtual environment? Maybe you can provide with stack traceback

[aminalaee]

@miriam-z This isn't a FastAPI issue, you need to make use of virtual environments or something like pipenv.

[mehmetavnicelik]

hey! i have the same problem. is it solved? if so can you explain it please?

[tqd9563]

I have the same problem too. How can I deal with it?

[JarroVGIT]

This is not a FastAPI issue but an import issue. It’s impossible to provide a general solution, as there can be many causes.