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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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   "metadata": {},
   "source": [
    "# Python keywords\n",
    "\n",
    "#### Python's keywords are part of the syntax of the language's statements. They are all reserved, so you cannot use them as identifiers.\n",
    "- All the keywords are ower-cased except for `None`, `True`, and `False`."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "import keyword\n",
    "\n",
    "print(f'{len(keyword.kwlist)} keywords:')\n",
    "print()\n",
    "print(keyword.kwlist)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# 3.5 `if` Statement"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### At run time, the `if` statement executes a **suite** (group) of one or more statements if a condition is true. It skips the suite if the condition is false. Note the colon!"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "grade = 85"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "if grade >= 60:\n",
    "    print('Passed')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "grade = 50"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "if grade >= 60:\n",
    "    print('Passed')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "grade = 90\n",
    "\n",
    "if grade >= 60:\n",
    "    print('Passed')\n",
    "    print('Good job!')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "grade = 50\n",
    "\n",
    "if grade >= 60:\n",
    "    print('Passed')\n",
    "    print('Good job!')"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Suite Indentation"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### We must indent the suite consistently after the `if` statement. Python programmers prefer to indent by 4 spaces. In a Juypyter notebook, pressing the tab key indents that amount."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "if grade >= 60:\n",
    "print('Passed')  # statement is not indented properly"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "if grade >= 60:\n",
    "    print('Passed')\n",
    "  print('Good job!')  ## inconsistent indentation"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### `if` Statement Flowchart\n",
    "#### Every Expression Can Be Treated as `True` or `False`"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "if 1:\n",
    "    print('Nonzero values are true, so this will print')\n",
    "    \n",
    "if 'a string':\n",
    "    print('A nonempty string value is also true.')\n",
    "    \n",
    "if True:\n",
    "    print('The value True is true, of course.')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "if 0:\n",
    "    print('Zero is false, so this will not print')\n",
    "    \n",
    "if '':\n",
    "    print('An empty string is false, so this also will not print.')\n",
    "    \n",
    "if False:\n",
    "    print('The value False is false, so do not print this either.')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "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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