Jan 29, 2016 When you run a single Python script from the command-line with python script.py, interpretation starts at the first line and continues line by line. If a line starts a class or function definition, the definition is stored for later reference. If the line is executable code, it is directly executed. A Python program is constructed from code blocks. A block is a piece of Python program text that is executed as a unit. The following are blocks: a module, a function body, and a class definition. Each command typed interactively is a block.
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As a program executes, the interpreter always keeps track of which statement is about to be executed. We call this the control flow, or the flow of execution of the program. When humans execute programs, they often use their finger to point to each statement in turn. So you could think of control flow as “Python’s moving finger”.
Vga driver version. Control flow until now has been strictly top to bottom, one statement at a time. We call this type of control sequential. Sequential flow of control is always assumed to be the default behavior for a computer program. The
for statement changes this.
Flow of control is often easy to visualize and understand if we draw a flowchart. This flowchart shows the exact steps and logic of how the
for statement executes.
Execution Flow Of Python Script
A codelens demonstration is a good way to help you visualize exactly how the flow of control works with the
for loop. Try stepping forward and backward through the program by pressing the buttons. You can see the value of name change as the loop iterates through the list of friends.
Python Stop Program Execution
(vtest)
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