Basics

Values

Python programs evaluate expressions into objects such as text, numbers, booleans, and None.

Start with several built-in values. Python does not require declarations before binding these names, and each value is still an object with a type.

Source

text = "python"
count = 3
ratio = 2.5
ready = True
missing = None

print(type(text).__name__)

Output

str

Methods and operators evaluate to new values. The original text, count, and ratio bindings remain ordinary objects you can reuse.

Source

print(text.upper())
print(count + 4)
print(ratio * 2)

Output

PYTHON
7
5.0

Boolean expressions combine facts, and None is checked by identity because it is a singleton absence marker.

Source

print(ready and count > 0)
print(missing is None)

Output

True
True

Notes

Values are objects; names point to them and operations usually create new values.
Use is None for the absence marker, not == None.
This overview introduces boundaries that later pages explain in detail.

Run the complete example

str
PYTHON
7
5.0
True
True

Execution time appears here after you run the example.