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add solution set
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@aerenchyma
aerenchyma committed Oct 10, 2014
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Expand Up @@ -99,109 +99,284 @@ Problem Set

3. Define a function called add_three, which takes one integer as input and returns that integer + 3.

.. activecode:: ps_5_3
.. tabbed:: ps5_pb3

# Write your code here.
# (The tests for this problem are going to try to CALL the function that you write!)
.. tab:: Problem

====
.. activecode:: ps_5_3

import test
print "testing if add_three(2) equals 5"
test.testEqual(add_three(2),5)
print "testing if add_three(33) equals 36"
test.testEqual(add_three(33),36)
# Write your code here.
# (The tests for this problem are going to try to CALL the function that you write!)

====

import test
print "testing if add_three(2) equals 5"
test.testEqual(add_three(2),5)
print "testing if add_three(33) equals 36"
test.testEqual(add_three(33),36)

.. tab:: Solution

.. activecode:: ps_5_3s

# Write your code here.
# (The tests for this problem are going to try to CALL the function that you write!)

def add_three(x):
return x + 3

====

import test
print "testing if add_three(2) equals 5"
test.testEqual(add_three(2),5)
print "testing if add_three(33) equals 36"
test.testEqual(add_three(33),36)

4. Write code **that will keep printing what the user inputs over and over until the user enters the string "quit".**

.. activecode:: ps_5_4
.. tabbed:: ps5_pb4

# Write code here
.. tab:: Problem

====
print "\n---\n\n"
print "There are no tests for this problem"
.. activecode:: ps_5_4

# Write code here

====
print "\n---\n\n"
print "There are no tests for this problem"

.. tab:: Solution

.. activecode:: ps_5_4s

# Write code here
x = ""
while x != "quit":
x = raw_input("Please enter text. To stop, enter 'quit'.")

====
print "\n---\n\n"
print "There are no tests for this problem"

5. Take a look at the code below. You'll get an error if you run it as is. Change it so it works!

.. activecode:: ps_5_5
.. tabbed:: ps5_pb5

.. tab:: Problem

def subtract_five(inp)
print inp - 5
return None
.. activecode:: ps_5_5

def subtract_five(inp)
print inp - 5
return None

y = subtract_five(9) - 6

====

y = subtract_five(9) - 6
print "\n---\n\n"
import test
print "testing if y is -2"
test.testEqual(y, -2)


.. tab:: Solution

.. activecode:: ps_5_5s

def subtract_five(inp)
return inp - 5


y = subtract_five(9) - 6

====

====
print "\n---\n\n"
import test
print "testing if y is -2"
test.testEqual(y, -2)

print "\n---\n\n"
import test
print "testing if y is -2"
test.testEqual(y, -2)


6. Here's another bit of code with a problem. Fix it so it calls change_amounts on some input and prints out the results. Also, add comments about what's going on with the current code that causes a problem.

.. activecode:: ps_5_6
.. tabbed:: ps5_pb6

def change_amounts(yp):
n = yp - 4
return n * 7

print yp

====

print "\n---\n\n"
print "There are no tests for this problem"
.. tab:: Problem

.. activecode:: ps_5_6

def change_amounts(yp):
n = yp - 4
return n * 7

print yp

====

print "\n---\n\n"
print "There are no tests for this problem"

.. tab:: Solution

.. activecode:: ps_5_6s

def change_amounts(yp):
n = yp - 4
return n * 7

print change_amounts(8) # you could put any input into this function
# the important part is that you don't print things that are only in the scope
# of the function definition!

====

print "\n---\n\n"
print "There are no tests for this problem"


7. Define a function called change_amounts that takes one integer as input. If the input is larger than 10, it should return the input + 5. If the input is smaller than or equal to 10, it should return the input + 2.

.. activecode:: ps_5_7
.. tabbed:: ps5_pb7

# We've started you off with the first line...
def change_amounts(num_here):
pass # delete this line and put in your own code for the body of the function.

====

print "\n---\n\n"
import test
print "testing if change_amounts(9) equals 11"
test.testEqual(change_amounts(9),11)
print "testing if change_amounts(12) equals 17"
test.testEqual(change_amounts(12),17)
.. tab:: Problem

.. activecode:: ps_5_7

# We've started you off with the first line...
def change_amounts(num_here):
pass # delete this line and put in your own code for the body of the function.

====

print "\n---\n\n"
import test
print "testing if change_amounts(9) equals 11"
test.testEqual(change_amounts(9),11)
print "testing if change_amounts(12) equals 17"
test.testEqual(change_amounts(12),17)

.. tab:: Solution

.. activecode:: ps_5_7s

# We've started you off with the first line...
def change_amounts(num_here):
if num_here > 10:
return num_here + 5
else:
return num_here + 2

====

print "\n---\n\n"
import test
print "testing if change_amounts(9) equals 11"
test.testEqual(change_amounts(9),11)
print "testing if change_amounts(12) equals 17"
test.testEqual(change_amounts(12),17)

8. Given the string in the code below, write code to figure out what the most common word in the string is and assign that to the variable ``abc``. (Do not hard-code the right answer.) Hint: dictionaries will be useful here.

.. activecode:: ps_5_8
.. tabbed:: ps5_pb8

s = "Will there really be such a thing as morning in the morning"
# Write your code here...

====

print "\n---\n\n"
import test
print "testing whether abc is set correctly"
test.testEqual(abc, 'morning')
.. tab:: Problem

.. activecode:: ps_5_8

s = "Will there really be such a thing as morning in the morning"
# Write your code here...

====

print "\n---\n\n"
import test
print "testing whether abc is set correctly"
test.testEqual(abc, 'morning')

.. tab:: Solution

.. activecode:: ps_5_8s

s = "Will there really be such a thing as morning in the morning"

# this is a solution that involves writing a function
# you could also solve this problem by writing code that is not in a function definition
def common_word(st):
list_of_words = st.split()
d = {}
for w in list_of_words:
if w in d:
d[w] = d[w] + 1
else:
d[w] = 1
all_keys = d.keys()
commonest_key = all_keys[0]
for k in all_keys:
if d[k] > d[commonest_key]:
commonest_key = k
return commonest_key

abc = common_word(s) # calling the function and assigning the return value to abc

====

print "\n---\n\n"
import test
print "testing whether abc is set correctly"
test.testEqual(abc, 'morning')

9. We've given you another data file in this problem. It's called ``timely_file.txt``. Write code to figure out which is the most common word in the file. Again, save it in the variable abc.

.. activecode:: ps_5_9
.. tabbed:: ps5_pb9

# Write code here!

====

print "\n---\n\n"
import test
print "testing whether abc is set correctly"
test.testEqual(abc, 'the')
.. tab:: Problem

.. activecode:: ps_5_9

# Write code here!

====

print "\n---\n\n"
import test
print "testing whether abc is set correctly"
test.testEqual(abc, 'the')

.. tab:: Solution

.. activecode:: ps_5_9s

# can use the same function written in problem 8
def common_word(st):
list_of_words = st.split()
d = {}
for w in list_of_words:
if w in d:
d[w] = d[w] + 1
else:
d[w] = 1
all_keys = d.keys()
commonest_key = all_keys[0]
for k in all_keys:
if d[k] > d[commonest_key]:
commonest_key = k
return commonest_key

f = open("timely_file.txt","r")
contents = f.read()

abc = common_word(contents)


====

print "\n---\n\n"
import test
print "testing whether abc is set correctly"
test.testEqual(abc, 'the')


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