Уроки Python з нуля / #3 – Основні дії в мові Пітон

Summary

In this video lesson, the basics of Python programming are introduced, focusing on comments, outputting information with the `print()` function, and customizing output using parameters like `sep` and `end`. The lesson also covers special characters, basic math operations, user input using the `input()` function, and rounding numbers. Key Python functions such as `min()`, `max()`, and `abs()` are explained. This comprehensive introduction equips beginners with foundational skills needed to understand Python syntax and perform basic operations, setting the stage for more advanced lessons ahead.

Takeaways

• 😀 Comments in Python are created using the hash symbol (#), which allows programmers to describe their code for future reference without affecting the program's execution.
• 😀 The `print` function is used to output text and numbers to the console, and it can display multiple elements separated by commas.
• 😀 The `sep` parameter in the `print` function allows you to specify a separator (e.g., a comma or space) between the output elements.
• 😀 The `end` parameter in the `print` function determines what is printed at the end of the output (e.g., a dot or newline).
• 😀 Special characters like ` ` for a new line and ` ` for tabulation can be used inside strings to format output effectively.
• 😀 To include quotes within a string, escape them using a backslash (`'` or `"`), ensuring they are processed as part of the string.
• 😀 Mathematical operations like addition, subtraction, multiplication, division, and modulus can be performed in Python using standard operators.
• 😀 The `**` operator is used for exponentiation (e.g., `2**3` gives `8`, which is 2 raised to the power of 3).
• 😀 Built-in functions like `min()`, `max()`, and `abs()` can be used to find the smallest number, the largest number, and the absolute value of a number, respectively.
• 😀 The `input` function waits for the user to enter information in the console, which can then be used in the program for various purposes, like storing data or making decisions.

Q & A

What is the purpose of comments in Python programming?

Comments are used to describe and explain sections of code, helping other programmers understand what is happening in the code. They are not executed and do not affect the program's output.

How do you create a comment in Python?

To create a comment in Python, use the hash symbol (#) followed by the comment text. Everything after the hash symbol is treated as a comment.

What happens if you place comments next to each line of code?

Placing comments next to each line of code can make the code harder to read. It's best to use comments to describe larger sections of the code rather than writing them beside each individual line.

What is the function of the print() function in Python?

The print() function in Python is used to output information to the console. It can print strings, numbers, and other data types.

How can you combine different types of data (e.g., strings and numbers) in a print statement?

You can combine strings and numbers in a print statement by separating them with commas. Python automatically converts numbers to strings when printed.

What is the purpose of the 'sep' parameter in the print() function?

The 'sep' parameter in the print() function specifies the separator to use between printed items. By default, it is a space, but you can change it to any string or symbol, such as a comma or a hyphen.

How can you create a line break in the output of a print statement?

To create a line break in a print statement, use the special character '\n'. This tells Python to move to the next line in the output.

What is the difference between single quotes and double quotes in Python strings?

In Python, both single quotes (' ') and double quotes (' ') can be used to define strings. The main difference is that you can use one type of quote inside the other without escaping it, which is useful when your string contains quotes.

What are some basic mathematical operations in Python?

Basic mathematical operations in Python include addition (+), subtraction (-), multiplication (*), division (/), and exponentiation (**). Additionally, the modulo operator (%) can be used to find the remainder of a division.

What is the function of the input() function in Python?

The input() function in Python is used to take input from the user. It pauses the program, waits for the user to enter something, and then returns the entered data as a string.