When creating a context manager using a generator, the code before the yield statement is equivalent to the __enter__ method of a class-based context manager. It sets up the context before it's entered.

When attempting to access a non-existent key in a dictionary without using the get method, Python will raise a KeyError. To avoid this error, you can use the get method, which returns a default value (or None if not specified) instead of raising an error.

If an 'if' condition is false, the code will skip to the next sequential condition or the 'else' block if one is provided.

'pip' is the package installer for Python. It's used to install and manage software packages written in Python.

Variable names cannot start with a digit in Python, so "123myvar" is not a valid variable name.

When a Python module is imported, the code in the module is executed after importing. This allows you to use the module's functionality.

Using module aliases (aliases) in Python can make your code more readable and prevent naming conflicts when dealing with long module names or avoiding conflicts.

.py files contain Python source code, while .pyc files contain bytecode. Bytecode files (.pyc) are generated from source code (.py) to improve execution speed. The bytecode is platform-independent and can be executed faster.

NoSuchElementError is not a built-in exception in Python. The other options, ValueError, ImportError, and KeyError, are all common built-in exceptions in Python.

In Python, the keyword used to define a new class is 'class.' You use it to create a blueprint for objects with attributes and methods.