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Day 4 : Comments, Escape Sequences & Print Statement | Master Python in 100 Days

Day 4 : Comments, Escape Sequences & Print Statement


Welcome back to Day 4 of our Python journey! Today, we will dive deeper into three important topics: comments, escape sequences, and the print statement. Understanding these concepts is essential for writing clear and effective code. Let’s explore them in detail!


What are Comments?

Definition :

  • Comments are notes that you write in your code. They help explain what the code does. Python ignores these comments, so they don't affect how your program runs. Comments are helpful for anyone who reads your code, including you!

Comments are very useful for:

  • Explaining complex logic
  • Making the code easier to read
  • Providing context for future reference

Types of Comments

1. Single-Line Comments : These comments are written on one line and start with the # symbol. Python will ignore everything after the # on that line.

Example:

  • In this example, # This is a single-line comment explains that the line below it prints "Hello, World!". The comment helps anyone reading the code understand its purpose.

2. Multi-Line Comments : For comments that need more than one line, you can use triple quotes (""" or '''). This type of comment is helpful when you want to explain something in detail or when you want to temporarily stop a piece of code from running.


Example:

  • In this example, the comment starts and ends with triple quotes. It explains that the next line of code will print "Welcome to Python!" on the screen. This way, anyone reading the code can understand what the print statement is doing.



    • What are Escape Sequences?


    Definition :

    • Escape sequences are special characters in Python strings that begin with a backslash (\). They allow you to represent certain characters that are hard to include directly in strings, such as new lines, tabs, or quotation marks.


    Common Escape Sequences : 

    • \n - New Line: Moves the cursor to the next line in the output.
    • \t - Tab: Inserts a horizontal tab space, creating indentation in the output.
    • \\ - Backslash: Inserts a single backslash character.
    • \' - Single Quote: Allows you to include a single quote in a string surrounded by single quotes.
    • \" - Double Quote: Allows you to include a double quote in a string surrounded by double quotes.


      Using Escape Sequences:

      • Escape sequences help format strings in a more readable way. Here are some examples:


      • In these examples, we use escape sequences to format our output nicely.


      The Print Statement

      The print() function is used to display information on the screen. You can print strings, numbers, or even the results of calculations.

      Basic Usage:


      Printing Multiple Items:

      You can print multiple items by separating them with commas. Python will automatically add a space between each item.

      • This will output: My name is Samanta and I am 25 years old. Here, the comma separates the different items, allowing us to print variables and strings in one line.


      Formatting Output

      • For more complex output, Python provides several ways to format strings. One of the easiest methods is using f-strings (available in Python 3.6 and later), which allows you to embed expressions inside string literals.


      Example of f-Strings :
      • In this example, {name} and {age} are placeholders that will be replaced with the values of the variables. This makes the code cleaner and easier to read.


      Key Points We Have Learned

      • Comments are used to explain your code and are ignored by Python.
      • Escape sequences allow you to include special characters in strings, like new lines and tabs.
      • The print() function displays information on the screen and can print multiple items or formatted strings.

      Thank you for joining me on Day 4 of the "Master Python in 100 Days" challenge! Today, we explored comments, escape sequences, and the print statement in depth. These tools are essential for writing clear and effective Python code.

      Remember, practice is key to mastering these concepts, so take some time to experiment with what you’ve learned today. Tomorrow, we will dive into more exciting features of Python, and I can’t wait to continue this journey with you!

      Let’s keep growing, learning, and coding together!

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