Python- Day8- Numbers in Python

Numbers in Python

Used frequently in programming for various tasks like scoring in games, data representation, and information storage.

Integers:

• Basic operations: add (+), subtract (-), multiply (*), divide (/).

>>> 2 + 3
 5
 >>> 3 - 2
 1
 >>> 2 * 3
 6
 >>> 3 / 2
 1.5

• Exponents: use (**) for power calculations.

>>> 3 ** 2
 9
 >>> 3 ** 3
 27
 >>> 10 ** 6
 1000000

• Order of operations: follows standard math rules; parentheses can alter the order.

>>> 2 + 3*4
 14
 >>> (2 + 3) * 4
 20

Floats:

• Numbers with a decimal point.

>>> 0.1 + 0.1
 0.2
 >>> 0.2 + 0.2
 0.4
 >>> 2 * 0.1
 0.2
 >>> 2 * 0.2
 0.4

• Occasionally, calculations may produce extra decimal places due to internal representation.

 >>> 0.2 + 0.1
 0.30000000000000004
 >>> 3 * 0.1
 0.30000000000000004

Mixing Integers and Floats:

• Division always results in a float.

 >>> 4/2
 2.0

• Mixing integers and floats in other operations also results in a float.

 >>> 1 + 2.0
 3.0
 >>> 2 * 3.0
 6.0
 >>> 3.0 ** 2
 9.0

Underscores in Numbers:

• Used to group digits for readability (e.g., 1_000_000).

 >>> universe_age = 14_000_000_000

• Python ignores underscores when storing and processing these values.

>>> print(universe_age)
 14000000000

Multiple Assignment:

• Assign values to multiple variables in a single line using commas.

x, y, z = 0, 0, 0

• The number of variables must match the number of values.

Constants:

• Variables intended to remain unchanged throughout a program.
• Indicated by using all capital letters (e.g., MAX_CONNECTIONS = 5000).
• Python does not have built-in constants, but this convention is commonly used.

Comments :

Useful for adding notes and explanations within your code.
Helps describe the overall approach to solving problems, making code easier to understand.

Writing Comments:

• Use the hash mark (#) to start a comment.
• Everything after # is ignored by the Python interpreter.

# Say hello to everyone.
 print("Hello Python people!")

 Python ignores the first line and executes the second line.

 Hello Python people!

Aim for simplicity in your code whenever possible; avoid unnecessary complexity.

Write code that works; perfection can come later, or you can move on to new projects.

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