add ps5 draft, need to fix unix problems/setup for wk

pip2/source/Assignments/ps5.rst

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+:orphan:
+
+..  Copyright (C) Paul Resnick.  Permission is granted to copy, distribute
+    and/or modify this document under the terms of the GNU Free Documentation
+    License, Version 1.3 or any later version published by the Free Software
+    Foundation; with Invariant Sections being Forward, Prefaces, and
+    Contributor List, no Front-Cover Texts, and no Back-Cover Texts.  A copy of
+    the license is included in the section entitled "GNU Free Documentation
+    License".
+
+.. highlight:: python
+    :linenothreshold: 500
+
+
+Week 5: ends September 28
+=========================
+
+
+
+
+
+Reading Response
+----------------
+
+.. _reading_response_6:
+
+
+Unix Problems
+-------------
+
+.. _unix_pset5:
+
+Turn these in via CTools in the Assignments tab!
+
+1. Find lines in file with substring
+
+#. (Reference unix tutorial linked) Display all lines in ``list1`` and ``list2`` that contain the letter ``p``.
+
+#. Save a file in the ``106`` folder you created a couple weeks ago called ``fun_with_unix.txt``. Now use ``ls``, the ``|`` (pipe), and ``grep`` to find all filenames in your folder containing the string ``unix``. (Try this with other substrings and other folders)
+
+
+Problem Set
+-----------
+
+.. _problem_set_5:
+
+
+#. Define a function called add_three, which takes one integer as input and returns that integer + 3.
+
+	.. activecode:: ps_5_4
+
+		# Write your code here.
+		# (The tests for this problem are going to try to CALL the function that you write!)
+
+
+		====
+
+		import test
+		test.testEqual(add_three(2),5)
+		test.testEqual(add_three(33),36)
+
+
+#. 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
+
+		def subtract_five(inp)
+			print inp - 5
+			return None
+
+		y = subtract_five(9) - 6
+
+
+#. Here's another bit of code with a problem. Fix it so it works somehow, and comment about what's going on that causes a problem.
+
+	.. activecode:: ps_5_6
+
+		def change_amounts(yp):
+			n = yp - 4
+			return n * 7
+
+		print yp
+
+
+#. 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
+
+		# 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.
+
+
+#. 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
+
+		s = "Will there really be such a thing as morning in the morning"
+		# Write your code here...
+
+
+
+#. 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. 
+
+.. datafile:: timely_file.txt
+	:hide:
+
+	Autumn is interchangeably known as fall in the US and Canada, and is one of the four temperate seasons. Autumn marks the transition from summer into winter.
+	Some cultures regard the autumn equinox as mid autumn while others, with a longer temperature lag, treat it as the start of autumn then. 
+	In North America, autumn starts with the September equinox, while it ends with the winter solstice. 
+	(Wikipedia)
+
+
+	.. activecode:: ps_5_9
+
+		# Write code here!
+
+
+#. Write code to add to this code that will keep printing what the user inputs over and over until the user enters the string "quit".
+
+	.. activecode:: ps_5_10
+
+		word_in = raw_input("Please enter a word. It will print out. If you want to stop, type 'quit'.")
+		# Write the rest of your code here.
+
+