def thank_you(name):
    # This function prints a two-line personalized thank you message.
    print("\nYou are doing good work, %s!" % name)
    print("Thank you very much for your efforts on this project.")
    
thank_you('Adriana')
thank_you('Billy')
thank_you('Caroline')

###highlight=[10]
def thank_you(name):
    # This function prints a two-line personalized thank you message.
    print("\nYou are doing good work, %s!" % name)
    print("Thank you very much for your efforts on this project.")
    
thank_you('Adriana')
thank_you('Billy')
thank_you('Caroline')
thank_you()

###highlight=[2,3,4,5]
def thank_you(name='everyone'):
    # This function prints a two-line personalized thank you message.
    #  If no name is passed in, it prints a general thank you message
    #  to everyone.
    print("\nYou are doing good work, %s!" % name)
    print("Thank you very much for your efforts on this project.")
    
thank_you('Adriana')
thank_you('Billy')
thank_you('Caroline')
thank_you()

def describe_person(first_name, last_name, age):
    # This function takes in a person's first and last name,
    #  and their age.
    # It then prints this information out in a simple format.
    print("First name: %s" % first_name.title())
    print("Last name: %s" % last_name.title())
    print("Age: %d\n" % age)

describe_person('brian', 'kernighan', 71)
describe_person('ken', 'thompson', 70)
describe_person('adele', 'goldberg', 68)

###highlight=[10,11,12]
def describe_person(first_name, last_name, age):
    # This function takes in a person's first and last name,
    #  and their age.
    # It then prints this information out in a simple format.
    print("First name: %s" % first_name.title())
    print("Last name: %s" % last_name.title())
    print("Age: %d\n" % age)

describe_person(71, 'brian', 'kernighan')
describe_person(70, 'ken', 'thompson')
describe_person(68, 'adele', 'goldberg')

def describe_person(first_name, last_name, age):
    # This function takes in a person's first and last name,
    #  and their age.
    # It then prints this information out in a simple format.
    print("First name: %s" % first_name.title())
    print("Last name: %s" % last_name.title())
    print("Age: %d\n" % age)

describe_person(age=71, first_name='brian', last_name='kernighan')
describe_person(age=70, first_name='ken', last_name='thompson')
describe_person(age=68, first_name='adele', last_name='goldberg')

def describe_person(first_name, last_name, age, favorite_language):
    # This function takes in a person's first and last name,
    #  their age, and their favorite language.
    # It then prints this information out in a simple format.
    print("First name: %s" % first_name.title())
    print("Last name: %s" % last_name.title())
    print("Age: %d" % age)
    print("Favorite language: %s\n" % favorite_language)

describe_person('brian', 'kernighan', 71, 'C')
describe_person('ken', 'thompson', 70, 'Go')
describe_person('adele', 'goldberg', 68, 'Smalltalk')

###highlight=[2,7,8,9,10,11,12,13,14,15,16,17,18,19,20,22,23,24,25,26]
def describe_person(first_name, last_name, age=None, favorite_language=None, died=None):
    # This function takes in a person's first and last name,
    #  their age, and their favorite language.
    # It then prints this information out in a simple format.
    
    # Required information:
    print("First name: %s" % first_name.title())
    print("Last name: %s" % last_name.title())
    
    # Optional information:
    if age:
        print("Age: %d" % age)
    if favorite_language:
        print("Favorite language: %s" % favorite_language)
    if died:
        print("Died: %d" % died)
    
    # Blank line at end.
    print("\n")

describe_person('brian', 'kernighan', favorite_language='C')
describe_person('ken', 'thompson', age=70)
describe_person('adele', 'goldberg', age=68, favorite_language='Smalltalk')
describe_person('dennis', 'ritchie', favorite_language='C', died=2011)
describe_person('guido', 'van rossum', favorite_language='Python')

def adder(num_1, num_2):
    # This function adds two numbers together, and prints the sum.
    sum = num_1 + num_2
    print("The sum of your numbers is %d." % sum)
    
# Let's add some numbers.
adder(1, 2)
adder(-1, 2)
adder(1, -2)

###highlight=[8]
def adder(num_1, num_2):
    # This function adds two numbers together, and prints the sum.
    sum = num_1 + num_2
    print("The sum of your numbers is %d." % sum)
    
# Let's add some numbers.
adder(1, 2, 3)

def example_function(arg_1, arg_2, *arg_3):
    # Let's look at the argument values.
    print('\narg_1:', arg_1)
    print('arg_2:', arg_2)
    print('arg_3:', arg_3)
    
example_function(1, 2)
example_function(1, 2, 3)
example_function(1, 2, 3, 4)
example_function(1, 2, 3, 4, 5)

###highlight=[6,7]
def example_function(arg_1, arg_2, *arg_3):
    # Let's look at the argument values.
    print('\narg_1:', arg_1)
    print('arg_2:', arg_2)
    for value in arg_3:
        print('arg_3 value:', value)

example_function(1, 2)
example_function(1, 2, 3)
example_function(1, 2, 3, 4)
example_function(1, 2, 3, 4, 5)

def adder(num_1, num_2, *nums):
    # This function adds the given numbers together,
    #  and prints the sum.
    
    # Start by adding the first two numbers, which
    #  will always be present.
    sum = num_1 + num_2
    
    # Then add any other numbers that were sent.
    for num in nums:
        sum = sum + num
        
    # Print the results.
    print("The sum of your numbers is %d." % sum)
    
# Let's add some numbers.
adder(1, 2, 3)

###highlight=[19,20,21,22]
def adder(num_1, num_2, *nums):
    # This function adds the given numbers together,
    #  and prints the sum.
    
    # Start by adding the first two numbers, which
    #  will always be present.
    sum = num_1 + num_2
    
    # Then add any other numbers that were sent.
    for num in nums:
        sum = sum + num
        
    # Print the results.
    print("The sum of your numbers is %d." % sum)

    
# Let's add some numbers.
adder(1, 2)
adder(1, 2, 3)
adder(1, 2, 3, 4)
adder(1, 2, 3, 4, 5)

def example_function(arg_1, arg_2, **kwargs):
    # Let's look at the argument values.
    print('\narg_1:', arg_1)
    print('arg_2:', arg_2)
    print('arg_3:', kwargs)
    
example_function('a', 'b')
example_function('a', 'b', value_3='c')
example_function('a', 'b', value_3='c', value_4='d')
example_function('a', 'b', value_3='c', value_4='d', value_5='e')

###highlight=[6,7]
def example_function(arg_1, arg_2, **kwargs):
    # Let's look at the argument values.
    print('\narg_1:', arg_1)
    print('arg_2:', arg_2)
    for key, value in kwargs.items():
        print('arg_3 value:', value)
    
example_function('a', 'b')
example_function('a', 'b', value_3='c')
example_function('a', 'b', value_3='c', value_4='d')
example_function('a', 'b', value_3='c', value_4='d', value_5='e')

def describe_person(first_name, last_name, age=None, favorite_language=None, died=None):
    # This function takes in a person's first and last name,
    #  their age, and their favorite language.
    # It then prints this information out in a simple format.
    
    # Required information:
    print("First name: %s" % first_name.title())
    print("Last name: %s" % last_name.title())
    
    # Optional information:
    if age:
        print("Age: %d" % age)
    if favorite_language:
        print("Favorite language: %s" % favorite_language)
    if died:
        print("Died: %d" % died)
    
    # Blank line at end.
    print("\n")

describe_person('brian', 'kernighan', favorite_language='C')
describe_person('ken', 'thompson', age=70)
describe_person('adele', 'goldberg', age=68, favorite_language='Smalltalk')
describe_person('dennis', 'ritchie', favorite_language='C', died=2011)
describe_person('guido', 'van rossum', favorite_language='Python')

###highlight=[2,3,4,10,11,12]
def describe_person(first_name, last_name, **kwargs):
    # This function takes in a person's first and last name,
    #  and then an arbitrary number of keyword arguments.
    
    # Required information:
    print("First name: %s" % first_name.title())
    print("Last name: %s" % last_name.title())
    
    # Optional information:
    for key in kwargs:
        print("%s: %s" % (key.title(), kwargs[key]))
    
    # Blank line at end.
    print("\n")

describe_person('brian', 'kernighan', favorite_language='C')
describe_person('ken', 'thompson', age=70)
describe_person('adele', 'goldberg', age=68, favorite_language='Smalltalk')
describe_person('dennis', 'ritchie', favorite_language='C', died=2011)
describe_person('guido', 'van rossum', favorite_language='Python')

###highlight=[12,17,18,19,20,21]
def describe_person(first_name, last_name, **kwargs):
    # This function takes in a person's first and last name,
    #  and then an arbitrary number of keyword arguments.
    
    # Required information:
    print("First name: %s" % first_name.title())
    print("Last name: %s" % last_name.title())
    
    # Optional information:
    for key in kwargs:
        print("%s: %s" % (key.title().replace('_', ' '), kwargs[key]))
    
    # Blank line at end.
    print("\n")

describe_person('brian', 'kernighan', favorite_language='C', famous_book='The C Programming Language')
describe_person('ken', 'thompson', age=70, alma_mater='UC Berkeley')
describe_person('adele', 'goldberg', age=68, favorite_language='Smalltalk')
describe_person('dennis', 'ritchie', favorite_language='C', died=2011, famous_book='The C Programming Language')
describe_person('guido', 'van rossum', favorite_language='Python', company='Dropbox')