$course/Quizzes-201730/$Quiz 12/ Overloading the plus operator, doing the next set of questions while you do so.]]> Overloading the plus operator, doing the next set of questions while you do so.]]> true 11 + 22 evaluates to: (NOTE: write error if evaluating the expression generates an error.)]]> 11 + 22 evaluates to: (NOTE: write error if evaluating the expression generates an error.)]]> true '11' + '22' evaluates to: (NOTE: write error if evaluating the expression generates an error.)]]> '11' + '22' evaluates to: (NOTE: write error if evaluating the expression generates an error.)]]> true '11' + str(3 + 3) + '22' evaluates to: (NOTE: write error if evaluating the expression generates an error.)]]> '11' + str(3 + 3) + '22' evaluates to: (NOTE: write error if evaluating the expression generates an error.)]]> true '11' + 33 evaluates to: (NOTE: write error if evaluating the expression generates an error.)]]> '11' + 33 evaluates to: (NOTE: write error if evaluating the expression generates an error.)]]> true x = 1
y = 2
z = 3
print(x, y, z)]]> x = 1
y = 2
z = 3
print(x, y, z)]]> true 1, 2, 3]]> 1 2 3]]> 6]]> 123]]> x = 1
y = 2
z = 3
print(str(x) + str(y) + str(z))]]> x = 1
y = 2
z = 3
print(str(x) + str(y) + str(z))]]> true 1, 2, 3]]> 1 2 3]]> 6]]> 123]]> x = 1
y = 2
z = 3
print(x + y + z)]]> x = 1
y = 2
z = 3
print(x + y + z)]]> true 1, 2, 3]]> 1 2 3]]> 6]]> 123]]> x = 1
y = 2
z = 3
print(str(x + y) + str(z))]]> x = 1
y = 2
z = 3
print(str(x + y) + str(z))]]> true print_equation that given two numbers x and y, prints an equation for the sum of them. For example, if x is 65 and y is 11, the function would print 65+11=76.]]> print_equation that given two numbers x and y, prints an equation for the sum of them. For example, if x is 65 and y is 11, the function would print 65+11=76.]]> false Accumulating Sequences, doing the next set of questions while you do so.]]> Accumulating Sequences, doing the next set of questions while you do so.]]> true def make_simple_list(m, n):
"""
Returns the list [m, m+1, m+2, ... n],
where m and n are the given arguments.
For example, if m is 5 and n is 13,
then this function returns:
[5, 6, 7, 8, 9, 10, 11, 12, 13]
"""]]> def make_simple_list(m, n):
"""
Returns the list [m, m+1, m+2, ... n],
where m and n are the given arguments.
For example, if m is 5 and n is 13,
then this function returns:
[5, 6, 7, 8, 9, 10, 11, 12, 13]
"""]]> true def make_simple_list(m, n):
""" Same specification as on the previous item. """
seq = []
for k in range(m, n + 1):
seq = seq + [k]
return seq
]]> def make_simple_list(m, n):
""" Same specification as on the previous item. """
seq = []
for k in range(m, n + 1):
seq = seq + [k]
return seq
]]> true def make_list(n):
"""
Returns the list [1, 2, 3, ... n],
where n is the given argument.
For example, if n is 5,
then this function returns:
[1, 2, 3, 4, 5]
"""
seq = []
for k in range(n):
???
return seq
]]> def make_list(n):
"""
Returns the list [1, 2, 3, ... n],
where n is the given argument.
For example, if n is 5,
then this function returns:
[1, 2, 3, 4, 5]
"""
seq = []
for k in range(n):
???
return seq
]]> true seq = seq[k]]]> seq = seq[k + 1 ]]]> seq = seq + k]]> seq = seq + k + 1]]> seq = seq[k] + [k]]]> seq[k] = seq[k] + [k]]]> seq = seq + [k + 1]]]> seq = seq + seq[k]]]> seq = seq + seq[k + 1]]]> x = 0
for k in range(5):
x = x + (2 * k)
print(x) ]]> x = 0
for k in range(5):
x = x + (2 * k)
print(x) ]]> true x = []
for k in range(5):
x = x + [(2 * k)]
print(x) ]]> x = []
for k in range(5):
x = x + [(2 * k)]
print(x) ]]> true x = ()
for k in range(5):
x = x + ((2 * k),)
print(x) ]]> x = ()
for k in range(5):
x = x + ((2 * k),)
print(x) ]]> true x = ''
for k in range(5):
x = x + str(2 * k)
print(x) ]]> x = ''
for k in range(5):
x = x + str(2 * k)
print(x) ]]> true str function is necessary.]]> str function is necessary.]]> true Sequences, doing the next set of questions while you do so.]]> Sequences, doing the next set of questions while you do so.]]> true def foo1(seq):
total = 0
for k in range(len(seq) // 2):
total = total + seq[1 + (2 * k)]
return total

def foo2(seq):
total = 0
for k in range(1, len(seq), 2):
total = total + seq[k]
return total

def foo3(seq):
total = 0
m = 1
for _ in range(len(seq) // 2):
total = total + seq[m]
m = m + 2
return total
]]> def foo1(seq):
total = 0
for k in range(len(seq) // 2):
total = total + seq[1 + (2 * k)]
return total

def foo2(seq):
total = 0
for k in range(1, len(seq), 2):
total = total + seq[k]
return total

def foo3(seq):
total = 0
m = 1
for _ in range(len(seq) // 2):
total = total + seq[m]
m = m + 2
return total
]]> true foo1([3]) evaluate?]]> foo1([3]) evaluate?]]> true foo1([3, 6]) evaluate?]]> foo1([3, 6]) evaluate?]]> true foo1([3, 6, 1, 4, 9, 5]) evaluate?]]> foo1([3, 6, 1, 4, 9, 5]) evaluate?]]> true foo2([3]) evaluate?]]> foo2([3]) evaluate?]]> true foo2([3, 6]) evaluate?]]> foo2([3, 6]) evaluate?]]> true foo2([3, 6, 1, 4, 9, 5]) evaluate?]]> foo2([3, 6, 1, 4, 9, 5]) evaluate?]]> true foo3([3]) evaluate?]]> foo3([3]) evaluate?]]> true foo3([3, 6]) evaluate?]]> foo3([3, 6]) evaluate?]]> true foo3([3, 6, 1, 4, 9, 5]) evaluate?]]> foo3([3, 6, 1, 4, 9, 5]) evaluate?]]> true returns the first negative item in the sequence of numbers, or None if the sequence contains no negative numbers. One function is correct and the other is wrong.

def find1(numbers):
    for k in range(len(numbers)):
        if numbers[k] < 0:
            return numbers[k]
        else:
            return None


def find2(numbers):
    for k in range(len(numbers)):
        if numbers[k] < 0:
            return numbers[k]
    return None

]]> returns the first negative item in the sequence of numbers, or None if the sequence contains no negative numbers. One function is correct and the other is wrong.

def find1(numbers):
    for k in range(len(numbers)):
        if numbers[k] < 0:
            return numbers[k]
        else:
            return None


def find2(numbers):
    for k in range(len(numbers)):
        if numbers[k] < 0:
            return numbers[k]
    return None

]]> true find1( [-3, 6, 1, 4, 9, 5] )?]]> find1( [-3, 6, 1, 4, 9, 5] )?]]> true find2( [-3, 6, 1, 4, 9, 5] )?]]> find2( [-3, 6, 1, 4, 9, 5] )?]]> true find1( [3, 6, 1, 4, 9, 5] )?]]> find1( [3, 6, 1, 4, 9, 5] )?]]> true find2( [3, 6, 1, 4, 9, 5] )?]]> find2( [3, 6, 1, 4, 9, 5] )?]]> true find1( [3, -6, 1, 4, 9, 5] )?]]> find1( [3, -6, 1, 4, 9, 5] )?]]> true find2( [3, -6, 1, 4, 9, 5] )?]]> find2( [3, -6, 1, 4, 9, 5] )?]]> true true find1]]> find2]]> true