Solution to the problem "/bin/sh: pip: command not found" during Dockerfile build

The content of the written Dockerfile is:

FROM python:3.6.8

RUN pip install --upgrade pip

WORKDIR /code
ADD ./code

RUN pip install -r requirements.txt

ENTRYPOINT ["pytest"]

When executing the image creation to RUN pip install --upgrade pip, it reports /bin/sh: pip: command not found, and it is found that pip cannot be found:

It is found that the called image cannot find the pip command. Here is my solution:

I directly deleted the image I originally called, and then rebuilt it, and downloaded the image again. At this time, I can

docker rmi -f python:3.6.8

docker build -t python_pytest:v1 .

I also checked some information online. Most of the suggestions were to install pip in the image or write the installation command in the dockerfile. I tried both of them and found that there were still other pitfalls. Finally, I found that directly deleting the image and re-downloading it was the fastest solution. I hope it can help everyone.

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