https://learn-python.com/ Free Python tutorials plus the part nobody else covers: how to configure coding agents for Python, and how to review the Python they write. Sun, 06 Sep 2026 03:07:12 GMT https://learn-python.com/hello-world/https://learn-python.com/hello-world/Python is a very simple language, and has a very straightforward syntax. It encourages programmers to program without boilerplate (prepared) code. https://learn-python.com/ai/agent-setup/https://learn-python.com/ai/agent-setup/The twenty minutes of setup that decide whether an agent is useful on your Python codebase or an expensive way to generate rework. https://learn-python.com/review/failure-modes/https://learn-python.com/review/failure-modes/A working catalogue of the bugs that show up over and over in generated Python — what each one looks like, why models produce it, and the check that catches it. https://learn-python.com/variables-and-types/https://learn-python.com/variables-and-types/Python is completely object oriented, and not “statically typed”. You do not need to declare variables before using them, or declare their type. https://learn-python.com/review/dependencies/https://learn-python.com/review/dependencies/Language models invent package names. Attackers have noticed, and register them. Here is the check that takes four seconds. https://learn-python.com/lists/https://learn-python.com/lists/Lists are very similar to arrays. They can contain any type of variable, and they can contain as many variables as you wish. https://learn-python.com/ai/agents-md/https://learn-python.com/ai/agents-md/Most AGENTS.md files are 400 lines of advice the model already knew. Here is what earns its place in the context window, and a Python template you can copy. https://learn-python.com/basic-operators/https://learn-python.com/basic-operators/This section explains how to use basic operators in Python. https://learn-python.com/review/security/https://learn-python.com/review/security/Generated code is not more malicious than human code. It is more confidently insecure, in a small number of predictable ways, at higher volume. https://learn-python.com/ai/feedback-loops/https://learn-python.com/ai/feedback-loops/An agent is only as good as the signal it gets back. Here is how to build a Python feedback loop that is fast, honest, and hard to game. https://learn-python.com/string-formatting/https://learn-python.com/string-formatting/Python uses C-style string formatting to create new, formatted strings. https://learn-python.com/ai/context/https://learn-python.com/ai/context/Codebase layout used to be a question of taste. It is now a performance parameter — for your agent and, it turns out, for the humans too. https://learn-python.com/review/performance/https://learn-python.com/review/performance/Generated Python is usually correct and frequently slow, in a small number of recognisable ways. None of them show up in a test. https://learn-python.com/basic-string-operations/https://learn-python.com/basic-string-operations/Strings are bits of text. They can be defined as anything between quotes: As you can see, the first thing you learned was printing a simple sentence. https://learn-python.com/ai/mcp/https://learn-python.com/ai/mcp/MCP lets an agent reach outside your codebase. Most of what gets installed is noise; a few of them change what the agent can actually do. https://learn-python.com/conditions/https://learn-python.com/conditions/Python uses boolean logic to evaluate conditions. The boolean values True and False are returned when an expression is compared or evaluated. https://learn-python.com/ai/spec-to-pr/https://learn-python.com/ai/spec-to-pr/The end-to-end workflow, including the two steps everybody skips and then pays for later. https://learn-python.com/loops/https://learn-python.com/loops/There are two types of loops in Python, for and while. For loops iterate over a given sequence. https://learn-python.com/ai/when-not-to/https://learn-python.com/ai/when-not-to/The cases where delegating costs more than doing it yourself — and the one that quietly costs the most. https://learn-python.com/functions/https://learn-python.com/functions/Functions are a convenient way to divide your code into useful blocks, allowing us to order our code, make it more readable, reuse it and save some time. https://learn-python.com/ai/evals/https://learn-python.com/ai/evals/Your function is now non-deterministic, slow, costs money per call and fails in ways an assertion cannot express. Here is a test strategy that still works. https://learn-python.com/classes-and-objects/https://learn-python.com/classes-and-objects/Objects are an encapsulation of variables and functions into a single entity. Objects get their variables and functions from classes. https://learn-python.com/ai/tokenomics/https://learn-python.com/ai/tokenomics/Counting tokens before you send them, attributing every call to a feature, and the four changes that usually halve the bill. https://learn-python.com/dictionaries/https://learn-python.com/dictionaries/A dictionary is a data type similar to arrays, but works with keys and values instead of indexes. https://learn-python.com/modules-and-packages/https://learn-python.com/modules-and-packages/In programming, a module is a piece of software that has a specific functionality. https://learn-python.com/files-and-context-managers/https://learn-python.com/files-and-context-managers/Reading and writing files, and the `with` statement that guarantees cleanup — the single most idiomatic construct in Python. https://learn-python.com/generators/https://learn-python.com/generators/Generators are very easy to implement, but a bit difficult to understand. Generators are used to create iterators, but with a different approach. https://learn-python.com/list-comprehensions/https://learn-python.com/list-comprehensions/List Comprehensions is a very powerful tool, which creates a new list based on another list, in a single, readable line. https://learn-python.com/multiple-function-arguments/https://learn-python.com/multiple-function-arguments/Every function in Python receives a predefined number of arguments, if declared normally, like this: It is possible to declare functions which receive a variable number of arguments, using the following syntax: The “therest” variable is a list of variables, which receives all arguments which were given to the “foo” function after the first 3 arguments. https://learn-python.com/regular-expressions/https://learn-python.com/regular-expressions/Regular Expressions (sometimes shortened to regexp, regex, or re) are a tool for matching patterns in text. In Python, we have the re module.