Python Comparison Operators ,Comments and Line Continuation

 

Python Comments and Line Continuation

Comments:

• Used to explain code, provide instructions, or disable code sections.

• Single-line comments: Start with #. Everything after # on that line is ignored by the interpreter.

• Multiline comments: Use triple quotes (''' or """). Everything between the quotes is ignored.

Example:

Python

# This is a single-line comment.

"""
This is a multiline comment.
It can span multiple lines.
"""

# This line is disabled using a single-line comment.
print("This line will not be executed.")

Line Continuation:

• Used to break long lines of code into multiple lines for readability.

• Achieved by using a backslash (\) at the end of the line without spaces.

• The next line is treated as a continuation of the current one.

Example:

Python

long_expression = 10 + \
                20 + \
                30
print(long_expression)  # Output: 60

Best Practices:

• Use comments sparingly but effectively to explain complex logic or non-obvious code.

• Use meaningful and descriptive comments that accurately reflect the code's purpose.

• Maintain consistent indentation for both code and comments.

• Use line continuation judiciously to avoid making code overly fragmented. Consider alternative approaches like using parentheses for complex expressions if possible.

Additional Notes:

• Comments are not removed during execution, so they are included in the final compiled bytecode.

• Commenting out code is a common way to temporarily disable sections for testing or debugging.

• Line continuation can also be used within strings and parentheses for clarity.

I hope this comprehensive explanation helps!

What are Comparison Operators?

Comparison operators are symbols used to compare two values in Python. They produce a Boolean result – either True or False. These operators form the backbone of decision-making within your code.

Common Comparison Operators

Here's a table of the most common comparison operators in Python:

Operator	Description	Example
==	Equal to	5 == 3 (False)
!=	Not equal to	10 != 10 (False)
>	Greater than	7 > 2 (True)
<	Less than	3 < 9 (True)
>=	Greater than or equal to	4 >= 4 (True)
<=	Less than or equal to	6 <= 8 (True)

Using Comparison Operators

Let's look at some examples:

Python

age = 25
if age >= 18: 
    print("You are eligible to vote.")

num1 = 10
num2 = 5
if num1 != num2:
    print("The numbers are different.")

Key Points

• Boolean Results: Comparisons always yield either True or False.

• Conditional Statements: Comparison operators are essential within if, elif, and else statements for controlling the flow of your programs.

• Loops: They help create conditions for loops like while and for (e.g., while i < 10).

• Chaining Comparisons: You can chain multiple comparisons together: 10 < x < 20