Created on Skills Network Labs

Exercise-3-2-Loops.ipynb

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       "range(0, 3)"
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   "source": [
    "1 # Use the range\n",
    "\n",
    "range(3)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "1982\n",
      "1980\n",
      "1973\n"
     ]
    }
   ],
   "source": [
    "2 # For loop example\n",
    "\n",
    "dates = [1982,1980,1973]\n",
    "N = len(dates)\n",
    "\n",
    "for i in range(N):\n",
    "    print(dates[i])   "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
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     "text": [
      "0\n",
      "1\n",
      "2\n",
      "3\n",
      "4\n",
      "5\n",
      "6\n",
      "7\n"
     ]
    }
   ],
   "source": [
    "3 # Example of for loop\n",
    "\n",
    "for i in range(0, 8):\n",
    "    print(i)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "1982\n",
      "1980\n",
      "1973\n"
     ]
    }
   ],
   "source": [
    "4 # Exmaple of for loop, loop through list\n",
    "\n",
    "for year in dates:  \n",
    "    print(year)   "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
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     "text": [
      "Before square  0 is red\n",
      "After square  0 is white\n",
      "Before square  1 is yellow\n",
      "After square  1 is white\n",
      "Before square  2 is green\n",
      "After square  2 is white\n",
      "Before square  3 is purple\n",
      "After square  3 is white\n",
      "Before square  4 is blue\n",
      "After square  4 is white\n"
     ]
    }
   ],
   "source": [
    "5 # Use for loop to change the elements in list\n",
    "\n",
    "squares = ['red', 'yellow', 'green', 'purple', 'blue']\n",
    "\n",
    "for i in range(0, 5):\n",
    "    print(\"Before square \", i, 'is',  squares[i])\n",
    "    squares[i] = 'white'\n",
    "    print(\"After square \", i, 'is',  squares[i])"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "0 red\n",
      "1 yellow\n",
      "2 green\n",
      "3 purple\n",
      "4 blue\n"
     ]
    }
   ],
   "source": [
    "6 # Loop through the list and iterate on both index and element value\n",
    "\n",
    "squares=['red', 'yellow', 'green', 'purple', 'blue']\n",
    "\n",
    "for i, square in enumerate(squares):\n",
    "    print(i, square)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "1982\n",
      "1980\n",
      "It took  2 repetitions to get out of loop.\n"
     ]
    }
   ],
   "source": [
    "7 # While Loop Example\n",
    "\n",
    "dates = [1982, 1980, 1973, 2000]\n",
    "\n",
    "i = 0\n",
    "year = dates[0]\n",
    "\n",
    "while(year != 1973):    \n",
    "    print(year)\n",
    "    i = i + 1\n",
    "    year = dates[i]\n",
    "    \n",
    "\n",
    "print(\"It took \", i ,\"repetitions to get out of loop.\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "-5\n",
      "-4\n",
      "-3\n",
      "-2\n",
      "-1\n",
      "0\n",
      "1\n",
      "2\n",
      "3\n",
      "4\n",
      "5\n"
     ]
    }
   ],
   "source": [
    "8 #Write a for loop the prints out all the element between -5 and 5 using the range function.\n",
    "for i in range(-5, 6):\n",
    "    print(i)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 15,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "rock\n",
      "R&B\n",
      "Soundtrack\n",
      "R&B\n",
      "soul\n",
      "pop\n"
     ]
    }
   ],
   "source": [
    "10 #Print the elements of the following list: \n",
    "Genres=[ 'rock', 'R&B', 'Soundtrack', 'R&B', 'soul', 'pop']\n",
    " \n",
    "for Genre in Genres:\n",
    "    print(Genre)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 16,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "red\n",
      "yellow\n",
      "green\n",
      "purple\n",
      "blue\n"
     ]
    }
   ],
   "source": [
    "16 # Write a for loop that prints out the following list: \n",
    "\n",
    "squares=['red', 'yellow', 'green', 'purple', 'blue']\n",
    "\n",
    "for square in squares:\n",
    "    print(square)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 18,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "10\n",
      "9.5\n",
      "10\n",
      "8\n",
      "7.5\n"
     ]
    }
   ],
   "source": [
    "17 # Write a while loop to display the values of the Rating of an album playlist stored in the list PlayListRatings. If the score is less than 6, exit the loop. The list PlayListRatings is given by: \n",
    "\n",
    "PlayListRatings = [10, 9.5, 10, 8, 7.5, 5, 10, 10]\n",
    "i = 1\n",
    "Rating = PlayListRatings[0]\n",
    "while(i < len(PlayListRatings) and Rating >= 6):\n",
    "    print(Rating)\n",
    "    Rating = PlayListRatings[i]\n",
    "    i = i + 1"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 20,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['orange', 'orange']\n"
     ]
    }
   ],
   "source": [
    "19 # Write a while loop to copy the strings 'orange' of the list\n",
    "\n",
    "squares = ['orange', 'orange', 'purple', 'blue ', 'orange']\n",
    "new_squares = []\n",
    "i = 0\n",
    "while(i < len(squares) and squares[i] == 'orange'):\n",
    "    new_squares.append(squares[i])\n",
    "    i = i + 1\n",
    "print (new_squares)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
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