Python 3 from Beginner to Expert - Learn Python from Scratch

Must to known shortcuts by every programmer. Do not forget to exercise them. You will save lots of time using them while writing programs in Python

How to import liblaries? How to remember all these things? What are functions? How to invoke a function? 

Commonly wrongly interpreted aspect of invoking function - because of that lecture you will save lots of time while debugging Python code. Please do not skip this lecture!

You will learn how to download (take) data from user of your program, assign that data to variables in your script and convert the data into proper type so your program doesn't crash. You will learn what does it mean to cast variable from one type to another.

Create a program that asks the user for their name, age, and favorite color.

What are comparison operators, why are they created and how do they work?

You will learn:

• how to react on data given by the user
• what are conditional statements and how to use them
• how indentation works in Python - it totally differs from other programming languages - so be careful!

It's time to practise Python by writing a simple Calculator that can add, subtract, divide and multiply numbers.

Count absolute value of a provided number.

Values that are different from 0 are equal to 'true' in Python.

What are logical operators 'and', 'or', 'not' and how to use them?

What are loops? What is loop while? Why should you use loops? How to use loops? All of that answered in this lecture!

Exercise: Adding numbers taken from the user using loop while.

What is loop for? What is list? How does loop for differs from loop while?

break vs continue

How does break and continue instruction work on practical example?

Time to practise your knowledge by writing a program asks the user for the number for guessing purpose.

•  What are lists?
•  How to create it?
•  How to change value of elements inside a list?
•  How to print values?
•  How to print all values at once?
•  Why do we need lists at all? ;)

How to check if the element is included or not included in the list.

How to give access to only people from provided list?

#len() - length

#.append - adding at the end SINGLLE element

#.extend - extending list by another list

#.insert(index, what) - put in

#.index(what) - return index of 'what'

#sort(reverse=False) - sort ascending

#max()

#min()

#.count - how many occurrences (how many times it shows up)

#.pop - pop last element (remove)

#.remove - remove first occurrence (first time it shows up)

#.clear - clear entire list

#.reverse - change the order

What is a tuple?

What is a difference between a tuple and a list?

When you should use tuple and when you should use list?

What is a dictionary?

How to add/remove/update items inside a dictionary?

What are keys/values?

What are sets? How to create them? What are they useful for?

Union, difference, subset, xor and conjuction. How to use them, and when to use them?

What is nested type? What problem do they solve? How to use them? How to access elements inside Nested type?

How to print out every element from the nested type?

When to choose dictionary inside a dictionary over list inside dictionary? What is the difference?

How to extract (Iterate through) values from nested dictionaries?

Write a program that will allow the user to:

1) Add new definitions

2) Search existing definitions

3) Delete the definition that he has chosen

What is a list comprehension? What problem do they solve? Why and when you should use list comprehension?

What are generator expressions? When you should use list comprehension and when you should choose generator expressions? What are benefits of using generator expressions?

What is a dictionary comprehension? How and when to use it?

How does set comprehension work? How to use set comprehension?

Find numbers from 2 to 470, that are:

- divisible by 7, but are not divisible by 5

What will you use?

1) generator expression

2) list comprehension

3) set comprehension

4) dictionary comprehension

Think for a second and make notes:

"is the answer to above question always the same?"

What are functions? How to create a function? Why should we use functions?

Function - is a block of code that you can access any time  to get the result you want.

So it is a code written by somebody, that we want to invoke,  by invoke we mean 'start a function', 'execute function' or call upon a function.  Function has a role (a function) - it solves the problem that is inside its name definition.             

              So it is a solution to solve the problem.

              Thanks to functions:

              1) We can change the code in one place and the change will affect code in every place

              2) The code can be reused as many times as we want, without having to write it again and again

              3) It makes your code cleaner

Passing more than one argument. Counting the area of rectangle

return as the name suggests returns to the place where the function was invoked.

Where the function is invoked is decided by you.

If you write in your code:

power(2, 3);

then the place where you write it is the place where the function was invoked.

After you invoke a function computer jumps to the declaration of function. He executes every instruction inside the function and then returns to the place where the function was invoked with the value that if put after return.

In the case you showed 'b'.

-----------------------------

Invoking means jumping/executing the function. Instead of word 'invoking' you can say "call upon a function", "start a function", or "execute a function".

What 'return' and 'invoke' means?

Create a menu for the user from which he can choose to  count the area of figures:

• square

• rectangle

• triangle

• circle

• trapeze

Remember to use functions.

Improve actual code with the new knowledge regarding functions.

How to create a multi module application? How to create your own module and import it inside another module?

In this lecture I will show you what 'enum' in Python is. Also you will finally understand WHY you should use it.

Write program, that will count the sum of all numbers from 1 to the number that was entered by the user.

For 5:

1+2+3+4+5

the result is gonna be:

15

In this lecture you will learn how to measure performance (how well or fast) some part of code is. It will help you decide what you should do in some cases.

You will learn how to use function as argument for another function. This will allow you for example to measure the performance of function.

On practical example I will show you how to use, when to use and what are default arguments.

In this lecture you will learn the difference between keyword and positional arguments.

EXERCISE TIME :-)

Write a function that will check if the container contains

searched value.

If the value is found return True

If the value is not found return False

CHECK PERFORMANCE of your function on set and list containing

over 1000 values.

How to send unkown amount of arguments and save them in a single parameter?

In this lecture you will learn about variable length argument.

What is local and global variables? What is the difference between local and global variable?

Mutable vs immutable objects

What are objects?

How they differ from variables?

What is the difference between mutable and immutable object?

What is the difference between shallow and deep copy of object? When should you use deep and when should you use shallow copy?

What are and when should you use anonymous/lambda functions?

EXERCISE where we will learn what is 'any' function and we will use it on practical example.

Use the any() function to determine if a person has a required set of skills.

Learn how to use the enumerate function to iterate over a list and also get the index of each item.