Python f-string tips & cheat sheets - Python Morsels
Python's string formatting syntax is both powerful and complex. Let's break it down and then look at some cheat sheets.| www.pythonmorsels.com
Python's string formatting syntax is both powerful and complex. Let's break it down and then look at some cheat sheets.| www.pythonmorsels.com
Dunder methods power most operators in Python as well as some of the built-in functions. Dunder methods are a contract between the person who made a class and Python itself.| www.pythonmorsels.com
In Python we care about the behavior of an object more than the type of an object. We say, "if it looks like a duck and walks like a duck, it's a duck." This idea is called duck typing.| www.pythonmorsels.com
Sets and dictionaries are powered by hashability. And hashable objects tend to be immutable.| www.pythonmorsels.com
Python's collections.Counter class is extremely handy, especially when paired with generator expressions.| www.pythonmorsels.com
Instead of using hard-coded indices to get tuple elements, use tuple unpacking to give descriptive names to each item. Important items should have a name instead of a number.| www.pythonmorsels.com
Sequences are iterables that have a length. Sequences are ordered collections (they maintain the order of their contents). The most common sequences built-in to Python are string, tuple, and list.| www.pythonmorsels.com
Context managers power Python's with blocks. They sandwich a code block between enter code and exit code. They're most often used for reusing common cleanup/teardown functionality.| www.pythonmorsels.com
In Python, slicing looks like indexing with colons (:). You can slice a list (or any sequence) to get the first few items, the last few items, or all items in reverse.| www.pythonmorsels.com
In Python, truthiness is asking the question, what happens if I convert an object to a boolean. Every Python object is truthy by default. Truthiness in Python is about non-emptiness and non-zeroness.| www.pythonmorsels.com
Want to customize what "equality" means for your class instances in Python? Implement a __eq__ method! Make sure to return NotImplemented as appropriate though.| www.pythonmorsels.com
Python's built-in functions list includes 71 functions now! Which built-in functions are worth knowing about? And which functions should you learn later?| www.pythonmorsels.com
Unlike traditional C-style for loops, Python's for loops don't have indexes. It's considered a best practice to avoid reaching for indexes unless you really need them.| www.pythonmorsels.com
Iterators are lazy iterables which power all iteration in Python. Iterators are the generic form of a generator-like object.| www.pythonmorsels.com
Python's list comprehensions are special-purpose tools for taking an old iterable, looping over it, and making a new list out of it.| www.pythonmorsels.com
The Python REPL is another name for Python's interactive Python interpreter, which accepts Python statements and immediately evaluates them.| www.pythonmorsels.com
Source code: Lib/decimal.py The decimal module provides support for fast correctly rounded decimal floating-point arithmetic. It offers several advantages over the float datatype: Decimal “is based...| Python documentation
Equality checks whether two objects represent the same value. Identity checks whether two variables point to the same object.| www.pythonmorsels.com
Source code: Lib/pickle.py The pickle module implements binary protocols for serializing and de-serializing a Python object structure. “Pickling” is the process whereby a Python object hierarchy is...| Python documentation
Source code: Lib/fractions.py The fractions module provides support for rational number arithmetic. A Fraction instance can be constructed from a pair of integers, from another rational number, or ...| Python documentation
A Python program is read by a parser. Input to the parser is a stream of tokens, generated by the lexical analyzer(also known as the tokenizer). This chapter describes how the lexical analyzer brea...| Python documentation
The following sections describe the standard types that are built into the interpreter. The principal built-in types are numerics, sequences, mappings, classes, instances and exceptions. Some colle...| Python documentation
Source code: Lib/typing.py This module provides runtime support for type hints. Consider the function below: The function surface_area_of_cube takes an argument expected to be an instance of float,...| Python documentation
>>>, The default Python prompt of the interactive shell. Often seen for code examples which can be executed interactively in the interpreter.,,..., Can refer to:- The default Python prompt of the i...| Python documentation
Source code: Lib/pathlib/ This module offers classes representing filesystem paths with semantics appropriate for different operating systems. Path classes are divided between pure paths, which pro...| Python documentation
Source code: Lib/os.py This module provides a portable way of using operating system dependent functionality. If you just want to read or write a file see open(), if you want to manipulate paths, s...| Python documentation
Source code: Lib/functools.py The functools module is for higher-order functions: functions that act on or return other functions. In general, any callable object can be treated as a function for t...| Python documentation
Objects, values and types: Objects are Python’s abstraction for data. All data in a Python program is represented by objects or by relations between objects. (In a sense, and in conformance to Von ...| Python documentation
Definitions for colloquial Python terminology (effectively an unofficial version of the Python glossary).| www.pythonmorsels.com
