Edit typos and grammar and add python files

thinkcspy/Chapter-2-Exercises/Python-Files/problem4.py

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+#5Runestone.Academy thinkcspy course
+# Chapter 2
+# Problem 4
+
+currentDay = input('''Enter the current day using one of the following numbers:
+Sunday    = 0
+Monday    = 1
+Tuesday   = 2
+Wednesday = 3
+Thursday  = 4
+Friday    = 5
+Saturday  = 6''')
+currentDay = int(currentDay)
+
+stayLength = input('How long is your stay?')
+stayLength = int(stayLength)
+
+# Improved upon the long windedness of my answer this time by following the example of the solution 
+# in the previous problem
+stay = currentDay + stayLength
+returnDay = stay % 7
+
+print('It is currently Day', currentDay,'.')
+print('Your stay is ', stayLength, 'days long.')
+print('You will return on Day', returnDay, '.')
+print('''Sunday    = 0
+Monday    = 1
+Tuesday   = 2
+Wednesday = 3
+Thursday  = 4
+Friday    = 5
+Saturday  = 6''')