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Python Lists: A Quick Reference 🐍

*   Definition: Lists are ordered, mutable collections that can contain various data types and duplicates.
*   Creating Lists: Creating empty, numerical, mixed, nested lists, and lists with duplicates.
*   Accessing List Elements: Accessing elements using positive and negative indexing, as well as slicing with

start:end:step

.
*   Common Operations: Adding, inserting, concatenating, deleting, clearing, searching, sorting, and reversing lists.
*   List Methods:

append()

,

insert()

,

extend()

,

remove()

,

pop()

,

clear()

,

index()

,

count()

,

sort()

, and

reverse()

.
*   List Comprehension: Quickly creating lists using expressions and conditions.
*   List vs. Tuple: Differences between mutable lists and immutable tuples.
*   Important Points: Specifics of indexing, slicing, data types, and working with lists.

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In Python 3.15, a single asterisk replaces nested loops. 🐍✨

Previously, to flatten a list, you would write:

rows = [[1, 2], [3], [4, 5]]

flat = [x for row in rows for x in row]

Now, you can simply use:

flat = [*row for row in rows]
# [1, 2, 3, 4, 5]

A double asterisk merges dictionaries: 📦

configs = [
    {"debug": False, "timeout": 10},
    {"timeout": 30},
]

config = {**part for part in configs}
# {'debug': False, 'timeout': 30}

When keys overlap, the last value wins – this is convenient for combining settings from multiple sources. ⚙️

Unpacking removes one level of nesting. In Python 3.14, this syntax within comprehensions will raise a SyntaxError. 🚫

https://peps.python.org/pep-0798/

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🚀 Django 6.1: Loading related data on demand, cascading deletion handled by the database, and a new email configuration.

The release was made on August 5th. Three major changes:

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Why regular expressions can hang on a simple string
Even a short string can cause a regular expression to take seconds or minutes to execute. The reason is catastrophic backtracking, where the engine tries a huge number of matching possibilities.
Let's look at an example:

import re

pattern = re.compile(r"(a+)+$")

text = "a" * 18 + "!"

print(bool(pattern.fullmatch(text)))

Output:

False

The expression (a+)+$ looks simple, but the problem lies in the nested quantifiers (a+)+. When the engine encounters the !, the match fails. However, before giving up, it tries various ways to distribute the a characters among the repetitions.
The number of possibilities grows rapidly with the length of the string. Let's check the execution time:

import re
from time import perf_counter

pattern = re.compile(r"(a+)+$")

for size in (10, 12, 14, 16, 18):
    text = "a" * size + "!"

    start = perf_counter()
    pattern.fullmatch(text)
    elapsed = perf_counter() - start

    print(size, f"{elapsed:.6f} сек.")

The time depends on the processor and the version of Python, but for this pattern, you'll see an exponential increase in execution time as the number of a characters increases. This is dangerous when processing user input or external data.
If you need to check if a string consists only of a characters, nested repetitions are not necessary:

pattern = re.compile(r"a+")

print(bool(pattern.fullmatch("aaaa")))
print(bool(pattern.fullmatch("aaaa!")))

Output:

True
False

But not every problematic pattern can be simplified so easily. Starting with Python 3.11, the re module supports atomic groups (?x).
They prevent the engine from backtracking inside a successfully matched group to try other possibilities:

import re

pattern = re.compile(r"(?x)a+!$")

print(bool(pattern.fullmatch("aaaa")))
print(bool(pattern.fullmatch("aaaa!")))

Output:

True
False

The group (?x)a+ fixes the captured sequence of characters. The engine can no longer redistribute them within the group, which eliminates catastrophic backtracking in this example.
In Python 3.11, possessive quantifiers are also available: *+, ++, and ?+. They do not release captured characters during backtracking:

pattern = re.compile(r"(a++)+$")

print(bool(pattern.fullmatch("aaaa")))
print(bool(pattern.fullmatch("aaaa!")))

Output:

True
False

Here, a++ is equivalent to (?x)a+, so nested repetitions no longer cause exponential backtracking.
However, possessive quantifiers can change the matching result:

import re

print(bool(re.fullmatch(r"a+a", "aa")))
print(bool(re.fullmatch(r"a++a", "aa")))

Output:

True
False

A regular a+ might return one character for the last a. The quantifier a++ does not allow this.
Let's compare the performance of all three options using timeit:

import re
import timeit

text = "a" * 18 + "!"

patterns = {
    "nested": re.compile(r"(a+)+$"),
    "atomic": re.compile(r"(?x)a+!$"),
    "possessive": re.compile(r"(a++)+$"),
}

for name, pattern in patterns.items():
    elapsed = timeit.timeit(
        lambda: pattern.fullmatch(text),
        number=10
    )

    print(name, f"{elapsed:.6f} сек.")

Here, the total time for ten runs of each pattern is measured. It's useful to test strings that almost match the expression but contain an incorrect character at the end.
🔥 Ambiguous nested repetitions can cause exponential growth in execution time. Atomic groups and possessive quantifiers help limit backtracking, but only if their use preserves the necessary matching logic.

📝 Cheat sheet for Python:

Higher-order functions:

🔹 map() - applies a function to each element
🔹 filter() - selects elements based on a condition
🔹 reduce() - sequentially combines elements into a single value

These functions help to process collections concisely and perform data transformations.

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