使用 pipenv 检查软件包是否安装

Question

Is there a way to check if a particular package is installed using pipenv? I have a Makefile which runs pipenv run <command> but I want to show a friendly message if the package is not installed and ask users to run pipenv install .

Currently the run command just creates new vitrualenv and just fails with command not found.

Answer 1

You can see what dependencies are installed in two ways : pipenv run pip freeze or pipenv graph .

You can then use grep on the output of this. grep returns 0 if it matches something, or non-zero if it doesn't, and you can check the return value by examining $? .

Putting it all together, you can do something like this:

pipenv run pip freeze | grep mypackage
if [ $? -ne 0 ]; then
    echo "mypackage isn't installed; run pipenv install mypackage"
fi

Answer 2

A solution can be to call the interpreter with a minimal code and then check the return code and based on the code display the message you want.

Something like this:

all:
    @python -c "import mypackage" 2>/dev/null|| (echo "";echo "error message";echo ""; exit 1)