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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": [
    "# 5.12 List Comprehensions"
   ]
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   "metadata": {},
   "source": [
    "#### A **list comprehension** is a consise and convenient way to create a new list. It can replace several lines of code involving a `for` loop that might contain an `if` statement."
   ]
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   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "list1 = []\n",
    "\n",
    "for item in range(1, 6):\n",
    "    list1.append(item)\n",
    "    \n",
    "list1"
   ]
  },
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   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Using a List Comprehension to Create a List of Integers"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "list2 = [item for item in range(1, 6)]\n",
    "\n",
    "list2"
   ]
  },
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   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### What's on to the right of the `=` is surrounded by square brackets, so we're assigning a list to variable `list2`. The elements of the list are represented by what's to the left of the keyword `for`, the variable `item`. The `for` clause makes variable `item` consecutively take on the values in `range(1, 6)`."
   ]
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   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### **EXERCISE** Use a list comprehension and the `range()` function with a step to create a list of the multiples of 3 that are less than 30."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### **EXERCISE** Use a list comprehension to create a list of tuples containing the numbers 1 through 5 and their cubes: `[(1, 1), (2, 8), (3, 27), …]`. "
   ]
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   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Mapping: Performing Operations in a List Comprehension’s Expression"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "list3 = [item**3 for item in range(1, 6)]\n",
    "\n",
    "list3"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Filtering: List Comprehensions with `if` Clauses "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "list4 = [item for item in range(1, 11) if item%2 == 0]\n",
    "\n",
    "list4"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### List Comprehension that Processes Another List’s Elements "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "colors = ['red', 'orange', 'yellow', 'green', 'blue']\n",
    "\n",
    "colors"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "colors2 = [item.upper() for item in colors]\n",
    "\n",
    "colors2"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "colors"
   ]
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  {
   "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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