Added practice exercise 1

practice_exercises/practice01/practice01.ipynb

@@ -6,15 +6,14 @@
    "source": [
     "# Practice Exercises 1: Expressions\n",
     "\n",
-    "Welcome to YData: An Introduction to Data Science!  Most weeks we will post practice exercises like this one to give you additional hands-on practice.  This is crucial for learning technical subjects\n",
+    "Welcome to YData: An Introduction to Data Science!  Most weeks we will post practice exercises like this one to give you additional hands-on practice.  \n",
     "\n",
     "Before we get started, there are some administrative details.\n",
     "\n",
     "Practice exercises are *not* required and will not be turned in for credit.\n",
     "\n",
-    "Collaborating on the practice exercises is encouraged! You should rarely be stuck for more than a few minutes on questions in these exercises, so ask a neighbor or come to the instructor's, TF's, or ULA's office hours for additional help. (Explaining things is beneficial, too -- the best way to solidify your knowledge of a subject is to explain it.) Please don't just share answers, though.\n",
+    "Collaborating on the practice exercises is strongly encouraged! You should rarely be stuck for more than a few minutes on questions in these exercises, so ask a neighbor or come to the instructor's, TF's, or ULA's office hours for additional help. (Explaining things is beneficial, too -- the best way to solidify your knowledge of a subject is to explain it.) Please don't just share answers, though.\n",
     "\n",
-    "You can read more about course policies on our [canvas site](https://canvas.yale.edu) on the [course website](http://ydata123.org/).\n",
     "\n",
     "#### Today's exercises\n",
     "\n",
@@ -25,7 +24,7 @@
     "3. call *functions* to use code other people have written; and\n",
     "4. break down Python code into smaller parts to understand it.\n",
     "\n",
-    "This lab covers parts of [Chapter 3](http://www.inferentialthinking.com/chapters/03/programming-in-python.html) of the online textbook. You should read the book, but not right now. Instead, let's get started!\n",
+    "These practice covers parts of [Chapter 3](http://www.inferentialthinking.com/chapters/03/programming-in-python.html) of the online textbook.\n",
     "\n",
     "Credit:  These practice exercises have been adapted from Berkeley's Data8 course."
    ]
@@ -269,7 +268,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "1+6*5-6*3**2*2**3/4*7"
+    "6+6*5-6*3**2*2**3/4*7"
    ]
   },
   {
@@ -278,7 +277,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "1+(6*5-(6*3))**2*((2**3)/4*7)"
+    "6+(6*5-(6*3))**2*((2**3)/4*7)"
    ]
   },
   {
@@ -287,13 +286,13 @@
    "source": [
     "In standard math notation, the first expression is\n",
     "\n",
-    "$$1 + 6 \\times 5 - 6 \\times 3^2 \\times \\frac{2^3}{4} \\times 7,$$\n",
+    "$$6 + 6 \\times 5 - 6 \\times 3^2 \\times \\frac{2^3}{4} \\times 7,$$\n",
     "\n",
     "while the second expression is\n",
     "\n",
-    "$$1 + (6 \\times 5 - (6 \\times 3))^2 \\times (\\frac{(2^3)}{4} \\times 7).$$\n",
+    "$$6 + (6 \\times 5 - (6 \\times 3))^2 \\times (\\frac{(2^3)}{4} \\times 7).$$\n",
     "\n",
-    "**Question 2.1.1.** Write a Python expression in this next cell that's equal to $5 \\times (3 \\frac{10}{11}) - 50 \\frac{1}{3} + 2^{.5 \\times 22} - \\frac{7}{33} + 1$.  That's five times three and ten elevenths, minus fifty and a third, plus two to the power of half 22, minus 7 33rds plus 1.  By \"$3 \\frac{10}{11}$\" we mean $3+\\frac{10}{11}$, not $3 \\times \\frac{10}{11}$.\n",
+    "**Question 2.1.1.** Write a Python expression in this next cell that's equal to $5 \\times (3 \\frac{10}{11}) - 50 \\frac{1}{3} + 2^{.5 \\times 22} - \\frac{7}{33} + 5$.  That's five times three and ten elevenths, minus fifty and a third, plus two to the power of half 22, minus 7 33rds plus 5.  By \"$3 \\frac{10}{11}$\" we mean $3+\\frac{10}{11}$, not $3 \\times \\frac{10}{11}$.\n",
     "\n",
     "Replace the ellipses (`...`) with your expression.  Try to use parentheses only when necessary.\n",
     "\n",
@@ -835,7 +834,7 @@
  "metadata": {
   "anaconda-cloud": {},
   "kernelspec": {
-   "display_name": "Python 3",
+   "display_name": "Python 3 (ipykernel)",
    "language": "python",
    "name": "python3"
   },
@@ -849,7 +848,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.5"
+   "version": "3.7.10"
   }
  },
  "nbformat": 4,