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# CS50 — A Taste of Python

## Harvard Mario’s Challenge Solver \o/ #PurePythonSeries — Episode #10

Hi! Let’s have fun! Just that! Let’s go to the amusement park and play with python?

This time, I’m taking the CS50 — from Harvard University.

`Solving CS50 — Pset1 — Exercise — Class 1Links:https://materiais.napratica.org.br/cc50https://www.napratica.org.br/curso-de-harvard-traduzido-cc50/https://cs50.harvard.edu/x/2021/`

Be welcome!

Let’s get started!

We need for loop:

`for(i = 0; i < n; i++):print('#')File "<ipython-input-82-101f42122273>", line 1    for(i = 0; i < n; i++):          ^SyntaxError: invalid syntax`

Opps! In Python, there is not C like syntax for(i=0; i<n; i++) but you use for in n.

If you want to automate a specific repetitive task or prevent yourself from writing repetitive code in your programs, using a loop is the best option for that.

Loops are a set of instructions that run repeatedly until a condition is met.

To solve these problems, we surely need one:

There are two types of loops built into Python:

for loops:

`for iterator in sequence:    execute expression`

while loops:

`while condition:    execute expression`

Let’s begin try in Python fashion way:

`for number in range(10, 21):   if number % 2 == 0:   print("The number", number, "is even")[out]The number 10 is evenThe number 12 is evenThe number 14 is evenThe number 16 is evenThe number 18 is evenThe number 20 is even`

Here is # Tuple Unpacking:

`x = [(1,2),(3,4),(5,6)]for item in x:   print(item)[out](1, 2)(3, 4)(5, 6)`

Or:

`for (a,b) in x:   print(a)[out]135`

Or even:

`for a,b in x:   print(a+1, b+1)[out]2 34 56 7`

Let’s review # Python end parameter in print() too:

`print("Welcome to" , end = ' ')print("GeeksforGeeks", end = ' ')[out]Welcome to GeeksforGeeks`

It ends line by space instead of \n.

Look here we did not call parameter in the first print:

`print("Welcome to")print("GeeksforGeeks", end = ' ')[out]Welcome toGeeksforGeeks`

# MARIO'S PIRAMID

## for inside for

`# Mario's pyramid upside down :)for i in range(0, 4):   for j in range(0,4-i):      print('#', end=" ")   print('')[out]# # # # # # # # # #`

Now :

`# Mario's pyramid left alignment:)for i in range(0, 4):   for j in range(0,i+1):      print('#', end=" ")   print('')[out]# # # # # # # # # #`

## Just while loop to ask and for to print

`# Mario's Pyramid right alignment:)# asks numbers between 0 and 8print('Height: ', end=' ')h = int(input());while(h<0 or h > 8):   print("That is an invalid input")   print('Height: ', end='')   h = int(input())for i in range(h):   print(" "*(h-i)+"#"*(i+1))[out]Height:  4    #   ##  ### ####`

A different for:

`# The counter's range is toyed with herefor i in range(1, h + 1):# The "i + 1" is removed print(" " * (h - i) + "#" * i)[out]   #  ## #######`

## #first:

`# Printing spacesh=4for i in range(h):   print(" "*(h-i));[out]`

Single Hash by line:

`# Printing 1 hash at the end of spacesh=4for i in range(h):   print(" "*(h-i)+"#")[out]    #   #  # #`

Final result:

`# Printing the whole Mari's Piramidh=4for i in range(h):   print(" "*(h-i)+"#"*(i+1))[out]    #   ##  ### ####`

Double Pyramid:

`print('Height: ', end='');h = int(input());while(h<0 or h > 8):   print("That is an invalid input")   print('Height: ', end='');   h = int(input());for i in range(h):   print(" "*(h-i)+"#"*(i+1)+ "  "+"#"*(i+1));[out]Height: 4    #  #   ##  ##  ###  ### ####  ####`

Enough o/

`print("That's it, folks. This is CS50! Harvard course, man \o/")That's it, folks. This is CS50! Harvard course, man \o/`

That’s all, folks!

See you soon o/

Bye!

👉git

## Credits & References

Harvard University

Fundacao Estudar

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## J3

Hi, Guys o/ I am J3! I am just a hobby-dev, playing around with Python, Django, Lego, Arduino, Raspy, PIC, AI… Welcome! Join us!