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   "source": [
    "### <center>San Jose State University<br>Department of Applied Data Science<br><br>**DATA 200<br>Computational Programming for Data Analytics**<br><br>Spring 2023<br>Instructor: Ron Mak</center>"
   ]
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   "source": [
    "# 5.7 Passing Lists to Functions"
   ]
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   "metadata": {},
   "source": [
    "### Passing an Entire List to a Function"
   ]
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   "metadata": {},
   "source": [
    "#### When we pass an object such as a list to a function, what the function receives is **not a copy** of the argument object, but a **reference** to the object. You can informally think of a reference to an object as the address of the object. Therefore, by using the object reference, the function is able to modify the argument itself."
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   "source": [
    "def modify_elements(items):\n",
    "    \"\"\"\"Multiplies all element values in items by 2.\"\"\"\n",
    "    for i in range(len(items)):\n",
    "        items[i] *= 2"
   ]
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   "source": [
    "numbers = [10, 3, 7, 1, 9]"
   ]
  },
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   "source": [
    "modify_elements(numbers)\n",
    "\n",
    "numbers"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### Yes indeed, the function has modified the actual argument, the list `numbers`."
   ]
  },
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   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Passing a Tuple to a Function"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### Remember that some sequences such a tuples are immutable."
   ]
  },
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   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
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   "source": [
    "numbers_tuple = (10, 20, 30)\n",
    "\n",
    "numbers_tuple"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "modify_elements(numbers_tuple)"
   ]
  },
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   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### A Note Regarding Tracebacks"
   ]
  },
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   "execution_count": null,
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   "outputs": [],
   "source": [
    "##########################################################################\n",
    "# (C) Copyright 2019 by Deitel & Associates, Inc. and                    #\n",
    "# Pearson Education, Inc. All Rights Reserved.                           #\n",
    "#                                                                        #\n",
    "# DISCLAIMER: The authors and publisher of this book have used their     #\n",
    "# best efforts in preparing the book. These efforts include the          #\n",
    "# development, research, and testing of the theories and programs        #\n",
    "# to determine their effectiveness. The authors and publisher make       #\n",
    "# no warranty of any kind, expressed or implied, with regard to these    #\n",
    "# programs or to the documentation contained in these books. The authors #\n",
    "# and publisher shall not be liable in any event for incidental or       #\n",
    "# consequential damages in connection with, or arising out of, the       #\n",
    "# furnishing, performance, or use of these programs.                     #\n",
    "##########################################################################\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Additional material (C) Copyright 2023 by Ronald Mak"
   ]
  }
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