Malpica's programmig

Dictionaries are used to assign a value to a specific key. It is necessary to know the key to retrieve the value. Dictionaries in Python are defined by braces  {}

For this code I decided to construct a dictionary. This dictionary has initially 5 key value pairs where the name of the album is the key.

As we have seen before with WSQ09 (the photo above) and WSQ11 we can work with files in Python. The only thing we need to do is to open the file and then we can start working with it. We can read the lines of the file but these are taken as a default by Python (by saying something); we can also write something in a file. The basic commands you need to know to work with files are the following:

open() = opens the file

read()= reads the file

lower()= makes the entire file in lowercase letters

write()= makes you able to modify the file and write something in it.

At some point working with your programming classes or experiences you will try your friends or someone else to try to use you programs, and you will know someone that will like to mess with the program. What do I mean?

Strings are what can be called a sequence of Unicode characters. In python we can recognize strings because they usually go inside single quotation marks or double quotation marks. In the particular case of Python, it does not have a character data type, this means that a single character is considered as a string with length 1.

When do I need to use a while loop, a for loop or recursion?The application of each one depends on what you want to do and how these loops work:

- While: it will perform a specific activity or series of steps until a certain condition that it’s true turns to false. Useful when you need to repeat a series of state until a statement is fulfilled.

- For: it executes a set of steps once for each value or item in a list, tuple, set, etc.. Useful when you need to apply a series of steps on each value of a variable.

We have already checked one form of using loos. For is another form to use loops in programming but what’s the difference? For me the best way to understand what a for loop does is to use it with a list. The photo shows the code of one exercise I had to do for a exam (I actually don’t know if it’s okay to post it).

You can see in the comments of the program what does the program does but I will focus in the for loop inside the find_threes function.

In order to make useful programs we need to know how to work with conditions and how it can change the “behavior” of the program and conditional statements are the ones that makes us life easier.

Now that we know what modules are I think it’s very useful for us to know that we can actually create modules by ourselves very easily.

The first thing to do is to create a file where we can put our functions, in this case I created a function called hello_name which allows me to print “Hello” and whatever the variable name gets assigned for.

After creating this file we have to save it and now we have to open another file in the same direction as our module file. For this new file we can do whatever we want. We first import our module by writing the words “import (the name of your module file)” now we can use our module.

The definition of a module is a file containing definitions and statements intended for use in other Python programs. Some of them come with Python as part of what is called as the standard library.

There are many modules in Python. So I posted here some examples of some modules.

Firstly we have the Mastery 03 code where we used a module to call the poem called “The Zen of Python”

Secondly we have a very funny module that is well known as the turtle module. This module will allow you to draw pictures as simple as a rectangle or as complex and funny as this code I posted.

We have already worked many times with functions and that’s because it’s really important for us to understand what they are and how they function.

For this exercise we were asked to download and “play” with this platform called SciLab but... what is SciLab?

SciLab is an open source software that provides a powerful computing environment  for engineering and scientific applications... did I mentioned it’s free?

This software has hundreds of mathematical functions, some of them are:

Maths & Simulation: Used for scientific and engineering applications like mathematical operations and data analysis.

Statistics: To perform data analysis and modeling

Optimization: To solve optimization problems (great explanation there)

Signal Processing: analyses, visualizes and filter signals in time and frequency domains.

2-D and 3-D Visualization: graphic functions to visualize, annotate and export data.