Python - Functions and While Loop (Day 6)

This is a 100 Days challenge to learn a new language (Python). 100 Days of Code - The Complete Python Pro Bootcamp 

I will post some notes to motivate myself to finish this challenge.

Function

Built-in and Custom Function 

With custom function, we can wrap some reusable code into a function and we can use it later.

It provides a way to reduce repetition, and also it improves readability.

Ex:

# Define a custom function

def my_function():

    # Do this

    # Then do this

    # Finally do this

    print("This is my function")

# Use the custom function

my_function()

Result:

This is my function

Indentation

In Python, indentation is really important, but Space V.S. Tab? Reference

Spaces are the preferred indentation method.

Use 4 spaces per indentation level.

Ex:

# * means a space (demo purpose)

def my_function(sky):

  ****if sky == "clear":

********print("blue")

  ****elif sky == "cloudy":

********print("grey")

  ****print("bye")

While Loops

Be careful the infinite loop...

Ex:

num = 0

while num < 3:

    print("this is inner of while loop")

    num = num + 1

Result:

this is inner of while loop this is inner of while loop this is inner of while loop

Challenge - Reeborg - Hurdle 1

Ex: Link

# Built-in Func

def turn_left():

    ...

def move():

    ....

def at_goal():

    ..

def front_is_clear():

    ...

# Custom Func

# Using built-in Func to generate a turn_right custom Func

def turn_right():

    turn_left()

    turn_left()

    turn_left()

def jump():

    turn_left()

    move()

    turn_right()

    move()

    turn_right()

    move()

    turn_left()

# Keep going if robot has not reached its goal

while not at_goal():

    # If there is no bar in front of it -> move

    if front_is_clear():

        move()

    # Jump if there is a bar in front of it

    else:

        jump()

Challenge - Reeborg - Hurdle 4

Ex: Link

# Built-in Func

def turn_left():

    ...

def move():

    ...

def at_goal():

    ...

def front_is_clear():

    ...

def right_is_clear():

    ...

# Custom Func # Using built-in Func to generate a turn_right custom Func

def turn_right():

    turn_left()

    turn_left()

    turn_left()

def jump_as_high_as_wall():

    turn_left()

    move()

    while not right_is_clear():

        move()

    turn_right()

def move_down_to_floor():

    turn_right()

    while front_is_clear():

        move()

    turn_left()

# Jump consisted of going up, move, and going down

def jump():

      # Up

    jump_as_high_as_wall()

      # Move

    move()

      # Down

    move_down_to_floor()

# Keep going if robot has not reached its goal

while not at_goal():

# If there is no bar in front of it -> move

    if front_is_clear():

        move()

# Jump if there is a bar in front of it

    else:

        jump()