When you execute the program, which line will be executed first?

The first line of the program that is not a comment or a blank line is executed first. In a typical Python script, this is the top‑most executable statement. If the program starts with a function definition, that definition is parsed but not executed until the function is called. Once a call is made, execution jumps into the function body and starts at its first statement. Thus, the first line of the script that runs is the first executable statement outside of any function or class definition.