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Difficulty: MediumBasic Scripting Languages and Constructs

A systems analyst is creating a Python script (.py) to monitor storage space and send alert logs when disk usage exceeds a specified threshold. Place the following script components in the correct logical execution sequence from top to bottom.

  1. 1Shebang directive line declaring the Python interpreter environment (#!/usr/bin/env python3)
  2. 2Module import statements loading required system libraries (import shutil, import sys)
  3. 3Environment variable declaration assigning the threshold limit (DISK_THRESHOLD = 85)
  4. 4Conditional construct evaluating current usage against DISK_THRESHOLD (if usage > DISK_THRESHOLD:)

Answer

The correct logical sequence for the Python script elements from top to bottom is: Shebang directive line declaring the interpreter environment, Module import statements, Environment variable declaration assigning the threshold limit, and Conditional construct evaluating current usage against the threshold.
In scripting languages such as Python or Bash, code executes sequentially from top to bottom. The shebang directive must appear first to define the interpreter environment. Next, required module libraries must be imported so their functions are available. Variable declarations must follow to set initial values and parameters. Finally, conditional constructs and control flow loops run using the initialized variables and imported module methods.

Step-by-Step Solution

1
Identify the file environment initialization requirement.
The shebang directive (#!/usr/bin/env python3) must be the first line of the file so the shell knows how to execute it.
Script interpreters check the first line of an executable file to determine the correct binary executor.
2
Identify dependency requirements before script code execution.
Module imports (import shutil, import sys) are placed immediately following the shebang line.
Libraries must be loaded into memory before their functions or classes can be called elsewhere in the script.
3
Locate variable definition prior to conditional evaluation.
The threshold variable assignment (DISK_THRESHOLD = 85) must come before the control flow logic that references it.
Scripts process sequentially; referencing an uninitialized variable in a conditional check causes a NameError or runtime failure.
4
Position the conditional branching construct in the main execution logic.
The conditional statement (if usage > DISK_THRESHOLD:) evaluates parameters after all prerequisite imports and variables are defined.
Decision-making logic depends on initialized variables and loaded library functions to execute correctly.

Key Concept

Logical structure and execution sequence of basic scripting constructs
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Topics

Basic Scripting Languages and Constructs

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