Practical Python Chapter 3 exercises

Practical Python Chapter 3 exercises

# 3. Following the function design recipe, define a function that has one
#    parameter, a number, and returns that number tripled.
def recipie(x):
    """ (number) -> number

    Following the function design recipe, define a function that has one
    parameter, a number, and returns that number tripled.
    """
    return x * 3

#-----------------------------------------------------------------------
# 4. Following the function design recipe, define a function that has two
#    parameters, both numbers, and returns the absolute value of the difference
#    of the two. Hint: Call the built-in abs function.
def absolute_difference(num1, num2):
    """ (number, number) -> number

    Return the absolute value of the difference between number1
    and number2.

    >>> absolute_difference(3, 7)
    4
    """
    return abs(num1 - num2)

#-----------------------------------------------------------------------
# 5. Following the function design recipe, define a function that has one
#    parameter, a distance in kilometers, and returns the distance in miles.
#    (There are 1.6 kilometers per mile.)
def convert_to_miles(k):
    """ (number) -> number
    define a function that has one
    parameter, a distance in kilometers, and returns the distance in miles.
    (There are 1.6 kilometers per mile.)
    """
    return k * 1.6

#-----------------------------------------------------------------------
# 6. Following the function design recipe, define a function that has three
#    parameters, grades between 0 and 100 inclusive, and returns the average
#    of those grades.
def grade_average(num1, num2, num3):
    """ (number, number, number) -> number

    Return the average of the grade1, grade2, and grade3, where
    each grade ranges from 0 to 100, inclusive.

    >>> grade_average(80, 95, 90)
    88.33333333333333
    """
    return (num1 + num2 + num3) /3

#-----------------------------------------------------------------------
# 7. Following the function design recipe, define a function that has four
#    parameters, all of them grades between 0 and 100 inclusive, and returns
#    the average of the best 3 of those grades. Hint: Call the function that you
#    defined in the previous question.
def av_grade(grade1, grade2, grade3, grade4):
    """ (number, number, number, number) -> number

    define a function that has four parameters,
    all of them grades between 0 and 100 inclusive, and returns
    the average of the best 3 of those grades. Hint: Call the function that you
    defined in the previous question.
    """
    sub_lowest_score = min(grade1, grade2, grade3, grade4)
    add_all_grades = (grade1 + grade2 + grade3 + grade4)
    best_three  = (add_all_grades - sub_lowest_score) /3
    return best_three

#-----------------------------------------------------------------------
# 8. Complete the examples in the docstring and then write the body of the
#    following function:
def weeks_elapsed(day1, day2):
    """ (int, int) -> int

    day1 and day2 are days in the same year. Return the number of full weeks
    that have elapsed between the two days.
    >>> weeks_elapsed(3, 20)
    2
    >>> weeks_elapsed(20, 3)
    2
    >>> weeks_elapsed(8, 5)
    >>> weeks_elapsed(40, 61)
    """
    return int(abs((day1 - day2) / 7))

#-----------------------------------------------------------------------
# 9. Consider this code:
def square(num):
    """ (number) -> number
    Return the square of num.
    >>> square(3)
    9
    """
    return num ** 2


# In the table below, fill in the Example column by writing square, num,
# square(3), and 3 next to the appropriate description.
# Description                   Example
# Parameter                     num
# Argument                      3
# Function name                 square
# Function call                 square(3)

#---------------------------------------------------------------------
# 10. Write the body of the square function from the previous question.
# Done