Suggested optional pre-requisites to have before the class

• Install Python 3 (3.8 recommended, any version from Python 3.6 is fine)
• Install PyCharm Community Edition or Professional Edition (is free for 30 days only)

Suggested optional reading material

• Having played a bit with it and attempted to do some exercises
• You can read my book Python 3 exercises for beginners:
  • https://leanpub.com/python3-exercises-beginners (my students can download it for free)
• You can watch some videos:
  • https://blog.carlesmateo.com/2020/03/31/lesson-0-learning-to-code-in-python-for-non-programmers/
  • https://blog.carlesmateo.com/2021/07/15/video-beginners-python-teaching-to-work-with-for-range-lists-dicts/

Examples of the class today have been upload here

• https://gitlab.com/carles.mateo/python-classes/-/tree/main/2021-11-11

Material from some other classes

• https://gitlab.com/carles.mateo/python-classes

On this class, recorded on the video (1h 48m)

Why there are different types of variables

• Memory
  • All are 0 and 1’s
• How big can be a variable (float, integer, string)
• Operations performed, like +
• MT Notation I use

The order in which the instructions are performed (top to bottom).

• Declaring a variable
• We can call thinks that were previously defined up (like functions)
• Loops will send the execution pointer up

• Operations with integer variables
  • Additions
• Operations with Strings

Language syntax and tricks (write a Notebook with your own notes)

• Pre-created solutions, like reverse an string with for
• Open a file, read the contents by lines to string, split the strings to arrays by a separator, like tab or space, get what you want by position.

with open(s_filename) as file:
    for s_line in file:
        print(s_line)

# Show Exceptions

# Show hexadecimal of the text:

# cd /home/carles/Desktop/code/carles/python-classes/2021-11-11

# hexdump -c text.txt

# remove enters, spaces at the end of the file with s_line.rstrip()

The blocks and functions

• Indentation
• Typical error missing :
• Functions are for reusing code and reducing errors
  • As they are for reusing, they are flexible (parameters)

The while loop

• The condition True
• The condition in a variable
• The condition in a if
• Break
• Pattern counter inside a loop

Building a Menu for user selection in text mode

• Input
• Validation

Questions

• As part of the questions, a question about the mental process to Build the solution was raised.
  • TODO: Was explained
  • The importance of keeping Notes with snippets of code that you normally use one time and another
  • How to search in Google to find explanations in Python sites
• A question was raised about how menus could be implemented using OOP
  • A parent Menu class, with a MenuAdmin class inheriting was demonstrated. The MenuAdmin inherits the menu options from the parent Menu, and adds Admin only options.