Added an image

Author: Oiangu9

EXERCISES/Exercises_Lecture_05.ipynb

@@ -14,11 +14,11 @@
     "## Exercise 1\n",
     "\n",
     "Programm a script that creates a file containing the following message:\n",
-    "\n",
+    "```\n",
     "Hi!  \n",
     "This is the last session of the python introductory course.  \n",
     "We hope you have enjoyed it!\n",
-    "\n",
+    "```\n",
     "Afterwards, the programm must print the lines one by one, adding the line number at the beggining of them and the number of words of each one at the end."
    ]
   },
@@ -76,11 +76,15 @@
    "source": [
     "## Exercise 2\n",
     "\n",
-    "Create a script containing a function $\\texttt{file_coder}$ that receives three parameters passed as input by the user: the name of both the file we we want to codify and the one we want to save the result in, in string format, and an integer number. \n",
+    "Create a script containing a function `file_coder()` that receives three parameters passed as input by the user: the name of both the file we we want to codify and the one we want to save the result in, in string format, and an integer number. \n",
     "\n",
     "The goal of this function is to codify the information in the input file and save the result in the output file, name of which will be passed as argument by the user. The method that you should use is the simple classical  $\\textit{Caesar cipher}$, which consists of changing all characters by another one some fixed number of positions down the alphabet we are working with, in this case ASCII code. \n",
     "\n",
-    "The script will have to make sure that the arguments are valid, so that they are in the corerct forma and making sure that exists such input file. If not, the programm will have to ask again for the arguments."
+    "The script will have to make sure that the arguments are valid, so that they are in the corerct forma and making sure that exists such input file. If not, the programm will have to ask again for the arguments.\n",
+    "\n",
+    "*Note*: Remember that in the end everything in your computer is saved as binarized numbers, 1-s or 0-s. As such, text or characters, must also be saved as numbers. The typical coding used to code each character of text into a number is the so called ASCII. For instance 'A' is saved as number 65, 'B' as 66 etc. You can find the dictionary bellow. In Python, in order to know the ASCII number for a character, say 'A' you can use the function `ord('A')`. On the other hand, if you need to convert an integer into its corresponding character, like 65 into 'A', you can use `ord(65)`.\n",
+    "<img src=\"https://upload.wikimedia.org/wikipedia/commons/thumb/1/1b/ASCII-Table-wide.svg/875px-ASCII-Table-wide.svg.png\" alt=\"Drawing\" style=\"width: 600px;\"/>\n",
+    "\n"
    ]
   },
   {
@@ -170,7 +174,7 @@
    "source": [
     "## Exercise 3\n",
     "\n",
-    "Let's now use .npy files for plotting data points. To do so, choose a certain number of points to plot $N$, a float $\\lambda$, say $\\lambda=0.5$ and plot the function $sin(x/\\lambda)$ for a certain range $[x_{min},x_{max}]$. Supose that you are receiving the x points from a .npy file. Therefore, the script should firstly create a grid of pints (hint: you can use the code of tha last session) and write the full list in a .npy file. Secondly, read the x points where the function has to be evaluated and then plot the result."
+    "Let's now use .npy files for plotting data points. To do so, choose a certain number of points to plot $N$, a float $\\lambda$, say $\\lambda=0.5$ and plot the function $f(x;\\lambda)=sin(x/\\lambda)$ for a certain range $x\\in[x_{min},x_{max}]$. Supose that you are receiving the x points from a `.npy` file. Therefore, the script should firstly create a grid of pints (hint: you can use the code of tha last session) and write the full list in a  `.npy ` file. Secondly, read the x points where the function has to be evaluated and then plot the result."
    ]
   },
   {