Python Questions

Directly using the variable name.

Using the class name followed by the variable name.

Using the 'self' keyword followed by the variable name.

Instance variables cannot be accessed within class methods.

deque

defaultdict

OrderedDict

Counter

It forces a function to return a value of a specific data type.

It allows a nested function to 'remember' and access variables from its enclosing function's scope even after the outer function has finished executing.

It prevents a function from accessing global variables.

It allows a function to be defined inside a class.

Faster code execution speed

Reduced memory consumption during execution

Improved code readability and organization

Elimination of the need for comments

keyword arguments, *args, positional arguments, **kwargs

**kwargs, keyword arguments, *args, positional arguments

*args, positional arguments, **kwargs, keyword arguments

positional arguments, keyword arguments, *args, **kwargs

math.pi

math(pi)

math->pi

pi

csv

file

text

data

To define a common interface for a set of related classes.

To create objects with multiple forms and behaviors.

To enable code reuse by inheriting from existing classes.

To hide the internal implementation details of a class from the outside world.

OrderedDict is mutable, while regular dictionaries are immutable.

OrderedDict supports list comprehensions for creating dictionaries, while regular dictionaries do not.

OrderedDict preserves the order of key insertion, while regular dictionaries do not guarantee order.

OrderedDict allows duplicate keys, while regular dictionaries do not.

It enables multiline matching.

It performs a greedy match.

It makes the pattern case-insensitive.

It treats the pattern as a raw string, ignoring escape sequences.