Variables and f-strings

Variables and f-strings

A variable is a name you attach to a value so you can refer to it later, like a sticky label on a box. Python doesn't make you declare a type up front: you assign, and the name now points at that value.

city = "Lisbon"     # the label `city` now points at the text "Lisbon"
servers = 4         # the label `servers` now points at the number 4

An f-string is a string prefixed with f, where anything inside {...} is replaced by the value of that expression: Mad Libs for your data.

print(f"{city} runs {servers} servers")   # → Lisbon runs 4 servers

Without the f, the braces are just literal characters.