Python Tutorials from Scratch | Strings: Functions, Indexes, and Slices (str)
In this video from the "Python Lessons from Scratch" series, we explore strings (the str type) in Python: basic string functions and methods, as well as indexes and slicing. Strings are used everywhere: in user input, text processing, files, parsing, and message formatting. Therefore, it's important to understand how to properly extract characters, take substrings, and apply text processing methods.
In this lesson, you'll learn:
What is a str string and why are strings immutable in Python?
Indices: how to get a character by index, what are negative indexes?
Slicing: s[start:end:step], how to extract part of a string, how to step, how to reverse a string;
Basic string functions:
len() — string length,
str() — string conversion;
The most useful string methods in practice:
lower(), upper(), capitalize(), title()
strip(), lstrip(), rstrip() — removing spaces/characters from the edges
replace() — replacing
find() / index() — searching
count() — counting occurrences
split() — splitting a string
join() — concatenating a list of strings
startswith() / endswith() — checking the beginning/end
common beginner mistakes:
out-of-bounds index (IndexError),
confusing find() and index(),
incorrect slicing boundaries,
expecting methods to modify the string "in place".
The video will also include simple practical examples: trimming spaces, replacing characters, getting a domain from an email, reassembling a string from parts, format checking, reversing a string, etc.
This lesson is suitable for:
beginners learning Python from scratch;
those who want to confidently work with text;
schoolchildren/students;
For those planning automation, parsing, data analysis, and web development.
👍 If you found this video helpful, give it a like.
💬 Tell us in the comments which string methods you confuse most often: split/join, find/index, strip/replace.
🔔 Subscribe—there will be dictionaries, functions, and more practice.
Hashtags:
#Python #PythonSNulya #PythonStrings #Indexes #Slices #PythonLessons
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