Installing a local module using npm?
you just provide one <folder> argument to npm install, argument should point toward the local folder instead of the package name: npm install /path
packages
Is the use of Java’s default package a bad practice?
Yes, it is. Ideally, package names should be globally unique, to avoid naming collisions. Using the default package breaks this convention. It’s also impossible to import a class from the default package. Why do unnamed packages exist at all, if it’s such a bad idea? From the JLS ยง7.4.2: Unnamed packages are provided by the … Read more
Elegant way to check for missing packages and install them?
Yes. If you have your list of packages, compare it to the output from installed.packages()[,”Package”] and install the missing packages. Something like this: list.of.packages <- c(“ggplot2”, “Rcpp”) new.packages <- list.of.packages[!(list.of.packages %in% installed.packages()[,”Package”])] if(length(new.packages)) install.packages(new.packages) Otherwise: If you put your code in a package and make them dependencies, then they will automatically be installed when you … Read more
Sibling package imports
Tired of sys.path hacks? There are plenty of sys.path.append -hacks available, but I found an alternative way of solving the problem in hand. Summary Wrap the code into one folder (e.g. packaged_stuff) Create setup.py script where you use setuptools.setup(). (see minimal setup.py below) Pip install the package in editable state with pip install -e <myproject_folder> … Read more
Can you find all classes in a package using reflection?
Due to the dynamic nature of class loaders, this is not possible. Class loaders are not required to tell the VM which classes it can provide, instead they are just handed requests for classes, and have to return a class or throw an exception. However, if you write your own class loaders, or examine the … Read more