Lära Förståelse av Numeriska Typer

Förkunskaper

Introduction to Python

Numbers are everywhere in Python. You'll use two core numeric types most of the time: integers (int) for whole numbers and floating-point numbers (float) for decimals (including scientific notation like 1e-3).

Integer and Float Essentials

Integers (int): whole numbers such as -2, 0, 7, 456566. Python supports arbitrarily large integers;
Floats (float): decimal values such as 2.5, 3.14159, 2.71828, or scientific notation like 6.02e23;
Truthiness: 0 and 0.0 are False, any other int/float is True in boolean contexts.


              123456
            
# Basic numeric literals (no type checks or conversions here)
n_int = 42
n_float = 3.14
n_sci = 1e-3   # 0.001

print(n_int, n_float, n_sci)

Writing Large Numbers Readably

Humans often write 1,000,000 or 1 000 000. Python doesn't allow commas or spaces inside numeric literals, use underscores for readability.


              12
            
million = 1_000_000
print(million == 1000000)   # True

Note

Floats are stored as binary fractions, tiny rounding differences are normal (e.g., 0.1 + 0.2 may not be exactly 0.3). You'll handle rounding and formatting later.

Var allt tydligt?

Tack för dina kommentarer!

Avsnitt 1. Kapitel 1

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Förkunskaper

Introduction to Python

Integer and Float Essentials

Integers (int): whole numbers such as -2, 0, 7, 456566. Python supports arbitrarily large integers;
Floats (float): decimal values such as 2.5, 3.14159, 2.71828, or scientific notation like 6.02e23;
Truthiness: 0 and 0.0 are False, any other int/float is True in boolean contexts.


              123456
            
# Basic numeric literals (no type checks or conversions here)
n_int = 42
n_float = 3.14
n_sci = 1e-3   # 0.001

print(n_int, n_float, n_sci)

Writing Large Numbers Readably

Humans often write 1,000,000 or 1 000 000. Python doesn't allow commas or spaces inside numeric literals, use underscores for readability.


              12
            
million = 1_000_000
print(million == 1000000)   # True

Note

Floats are stored as binary fractions, tiny rounding differences are normal (e.g., 0.1 + 0.2 may not be exactly 0.3). You'll handle rounding and formatting later.

Var allt tydligt?

Tack för dina kommentarer!

Avsnitt 1. Kapitel 1

Förståelse av Numeriska Typer

Integer and Float Essentials

Writing Large Numbers Readably

1. What is the type of `1e2`?

2. Which literal is valid in Python code for one million?

3. Pick the true statement about `int` and `float`.

Förståelse av Numeriska Typer

Integer and Float Essentials

Writing Large Numbers Readably

1. What is the type of `1e2`?

2. Which literal is valid in Python code for one million?

3. Pick the true statement about `int` and `float`.

Förståelse av Numeriska Typer

Integer and Float Essentials

Writing Large Numbers Readably

1. What is the type of 1e2?

2. Which literal is valid in Python code for one million?

3. Pick the true statement about int and float.

Förståelse av Numeriska Typer

Integer and Float Essentials

Writing Large Numbers Readably

1. What is the type of 1e2?

2. Which literal is valid in Python code for one million?

3. Pick the true statement about int and float.

1. What is the type of `1e2`?

3. Pick the true statement about `int` and `float`.

1. What is the type of `1e2`?

3. Pick the true statement about `int` and `float`.