# My first Python program
print("Hello World")


# The Python interpreter:
#    1. reads a line code
#    2. interprets the instruction
#    3. executes the instruction
#    4. increments the "program counter" and repeats until done
print("Hello")
print("my")
print("name")
print("is")
print("Inigo")
print("Montoya")


# This is a function consisting of:
#    1. a header (def ...): "def" is a keyword
#    2. a body (print ...): the body is indented using <tab>
def say_introduction():
    print("My name is Inigo Montoya.")

def threaten_vengeance():
    print("You killed my father.")
    print("Prepare to die.")

print("Hello.")


# This is a function consisting of:
#    1. a header (def ...): "def" is a keyword
#    2. a body (print ...): the body is indented using <tab>
def say_introduction():
    print("My name is Inigo Montoya.")

def threaten_vengeance():
    print("You killed my father.")
    print("Prepare to die.")
    # Do something...
    
print("Hello.")
say_introduction() # this is a function call
threaten_vengeance() # this is another function call
print("Hello.")
threaten_vengeance() # and another



# Abstraction hides the details of how things work and 
# makes it easier to make changes
def threaten_vengeance():
    print("You killed my father.")
    print("Prepare to die.")

def greet():
    print("Hello.")
    print("My name is Inigo Montoya.")

greet()
threaten_vengeance()
greet() 
threaten_vengeance()



# We can use functions that someone else wrote
#
# In these examples, we *pass* parameters to a function
from simplefunctions import print_sqrt # make a function available to you

print_sqrt(4) # call the function
print_sqrt(9)



# We can use functions that someone else wrote 
from simplefunctions import print_date_and_time # make a function available to you

print_date_and_time() # call the function