Question

When using python shell and code block what triggers the interpreter to begin evaluating?

Answer 1

Answer:

A code block is a piece of Python program text that can be executed as a unit, such as a module, a class definition or a function body. Some code blocks (like modules) are normally executed only once, others (like function bodies) may be executed many times. Code blocks may textually contain other code blocks. Code blocks may invoke other code blocks (that may or may not be textually contained in them) as part of their execution, e.g., by invoking (calling) a function.

The following are code blocks: A module is a code block. A function body is a code block. A class definition is a code block. Each command typed interactively is a separate code block; a script file (a file given as standard input to the interpreter or specified on the interpreter command line the first argument) is a code block; a script command (a command specified on the interpreter command line with the `-c' option) is a code block. The file read by the built-in function execfile() is a code block. The string argument passed to the built-in function eval() and to the exec statement is a code block. And finally, the expression read and evaluated by the built-in function input() is a code block.

A code block is executed in an execution frame. An execution frame contains some administrative information (used for debugging), determines where and how execution continues after the code block's execution has completed, and (perhaps most importantly) defines two namespaces, the local and the global namespace, that affect execution of the code block.

Answer 2

Explanation:

We can inform the 'Python interpreter' to perform or use code in the following ways:

• Using the 'command line', we can run the Python code file as a script.
• We can 'import' the Python code into another file or the interactive interpreter from one Python code file.
• Run 'Python scripts' from the chosen IDE or editor.
• Running a script in a 'file manager' by double-clicking its icon is another way of running the Python scripts.

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