HW1.py

# 2.11
# A. The sum of negative integers -7 through -1
print((-7) + (-6) + (-5) + (-4) + (-3) + (-2) + (-1))

# B. The average age of a group of kids at a summer camp given that 17 are 9 years old, 24 are 10 years
# old, 21 are 11 years old, and 27 are 12 years old
print(((17 * 9) + (24 * 10) + (21 * 11) + (27 * 12)) / 89 )

# C. 2 to the power -20
print(2 ** -20)

# D. The number of times 61 goes into 4356
print(4356 / 61)

# E. The remainder when 4365 is divided by 61
print(4365 % 61)

#---------

# 2.14
# A. The first character of string s is 'g'
s = 'goodbye'
print(s[0] == 'g')

# B. The seventh character of s is 'g'
print(s[6] == 'g')

# C. The first two characters of s are 'g' and 'a'
print(s[0] == 'g' and s[1] == 'a')

# D. The next to last character of s is ' x'
print(s[5] == 'x')

# E. The middle character of s is 'd'
print(s[3] == 'd')

# F. The first and last characters of strings are equal
print(s[0] == s[6])

# G. The last four characters of string s match the string ' tion'
print(s[-4:] == 'tion')

#---------

# 2.16
# A. Assign 6 to variable a and 7 to variable b.
a = 6
b = 7

# B. Assign to variable c the average of variables a and b.
c = (a + b) / 2

# C. Assign to variable inventory the list containing strings 'paper', 'staples'. and 'pencils'.
inventory = ['paper', 'staples', 'pencils']

# D. Assign to variables first, middle and last the strings 'John', 'Fitzgerald', and 'Kennedy' .
first = 'John'
middle = 'Fitzgerald'
last = 'Kennedy'

# E. Assign to variable fullname the concatenation of string variables first, middle, and last. Make sure you
# incorporate blank spaces appropriately.
fullname = first+" "+middle+" "+last

# DEBUGGING PURPOSES ONLY - IGNORE
print(fullname)

#---------

# 2.17
# A. The sum of 17 and -9 is less than 10.
print((17 + (-9)) < 10)

# B. The length of list inventory is more than five times the length of string fullname
print(len(inventory) > 5*len(fullname))

# C. c is no more than 24.
print(c <= 24)

# D. 6.75 is between the values of integers a and b.
print(a < 6.75) and (b > 6.75)

# E. The length of string middle is larger than the Iength of string first and smaller than the length string last.
print(len(middle) > len(first) and len(middle) < len(last))

# F. Either the list inventory is empty or it has more than I 0 objects in it.
print(len(inventory) == 0 or len(inventory) > 10)

#---------

# 2.18
# A. Assign to variable flowers a list containing strings 'rose'. 'bougainvillea', 'yucca', 'marigold',
# 'daylilly '.and 'lilly of the valley'.
flowers = ['rose', 'bougainvillea', 'yucca', 'marigold', 'daylilly', 'lilly of the valley']
print(flowers)

# B. Write a Boolean expression that evaluates to True if string 'potato' is in list flowers, and evaluate the
# expression.
print('potato' in flowers)

# C. Assign to list thorny the sublist consisting of the first three objects in list flowers.
thorny = flowers[0:3]
print(thorny)

# D. Assign to list poisonous the sublist consisting of just the last object of list flowers.
poisonous = [flowers[5]]
print(poisonous)

# E. Assign to list dangerous the concatenation of lists thorny and poisonous.
dangerous = thorny + poisonous
print(dangerous)

#---------

# 2.22
# The range of a list of numbers is the largest difference between any two numbers in the list. Write a Python
# expression that computes the range of a list of numbers 1st. If the list 1st is, say, [3, 7, -2, 12], the
# expression should evaluate to 14 (the difference between 12 and -2).
lst = [3, 7, -2, 12]
minVal = min(lst)
maxVal = max(lst)
print(maxVal - minVal)

#---------

# 2.28
# A. An expression that evaluates to the index of the middle element of lst
print(len(lst) / 2)

# B. An expression that evaluates to the middle element of 1st
print(lst[int(len(lst) / 2)])

# C. A statement that sorts the list 1st in descending order
print(sorted(lst, reverse = True))

# D. A statement that removes the first number of list lst and puts it at the end
lst.append(lst.pop())
print(lst)

# Note about result: If a list has even length, then the middle element is defined to be the rightmost of the two elements in the middle of the list.