What is a Python egg?

Note: Egg packaging has been superseded by Wheel packaging. Same concept as a .jar file in Java, it is a .zip file with some metadata files renamed .egg, for distributing code as bundles. Specifically: The Internal Structure of Python Eggs A “Python egg” is a logical structure embodying the release of a specific version of a Python project, comprising its code, … Read more

ModuleNotFoundError: No module named ‘sklearn’

I want to import sklearn but there is no module apparently: I am using Anaconda and Python 3.6.1; I have checked everywhere but still can’t find answers. When I use the command: conda install scikit-learn should this not just work?Where does anaconda install the package? I was checking the frameworks in my python library and there was nothing … Read more

ModuleNotFoundError: No module named ‘sklearn’

I want to import sklearn but there is no module apparently: I am using Anaconda and Python 3.6.1; I have checked everywhere but still can’t find answers. When I use the command: conda install scikit-learn should this not just work?Where does anaconda install the package? I was checking the frameworks in my python library and there was nothing … Read more

What is __init__.py for?

It used to be a required part of a package (old, pre-3.3 “regular package”, not newer 3.3+ “namespace package”). Here’s the documentation. Python defines two types of packages, regular packages and namespace packages. Regular packages are traditional packages as they existed in Python 3.2 and earlier. A regular package is typically implemented as a directory … Read more

What is __init__.py for?

It used to be a required part of a package (old, pre-3.3 “regular package”, not newer 3.3+ “namespace package”). Here’s the documentation. Python defines two types of packages, regular packages and namespace packages. Regular packages are traditional packages as they existed in Python 3.2 and earlier. A regular package is typically implemented as a directory … Read more

How can I solve “java.lang.NoClassDefFoundError”?

After you compile your code, you end up with .class files for each class in your program. These binary files are the bytecode that Java interprets to execute your program. The NoClassDefFoundError indicates that the classloader (in this case java.net.URLClassLoader), which is responsible for dynamically loading classes, cannot find the .class file for the class that you’re trying to use. Your code … Read more

“pip install unroll”: “python setup.py egg_info” failed with error code 1

ere’s a little guide explaining a little bit how I usually install new packages on Python + Windows. It seems you’re using Windows paths, so this answer will stick to that particular SO: I never use a system-wide Python installation. I only use virtualenvs, and usually I try to have the latest version of 2.x … Read more