Lesson 3 - intermediate exercise

Read the code in each section and do the following -

1. Add comments to explain the code
2. Suggest test data to test the code
3. Make the suggested changes.

The answers will only say what the code does and how to make the suggested change. Note - The code in these examples are using python I/O

filename = "test.txt"
names = ["bob", "sally", "fred"]

# open file in write mode
fileRef = open(filename, "w")
fileRef.writeLines(names)
fileRef.close()

Suggested change - Create two files. One to store names the other to store a-team quotes.

ateamFile = "ateam.txt"
quotes = ["I pity da fool", "I love it when a plan comes together"]
ateamFileRef = open (ateamFile, "w")
ateamFileRef.writeLines(quotes)
ateamFileRef.close()

file = open("test.txt")
while file:
	text = file.readline()
	print "line 1 - ", text
file.close()

Suggested changes Test to see if a line is equal to the text "Spud". If it is then print out "yay i found a spud!"

file = open("test.txt")
while file:
	text = file.readline()
	if text == "spud": print "yay i found a spud!"
	print "line 1 - ", text
file.close()

file = open("test.txt", "r")
output = []
for line in file.readlines():
	words = line.split()
	temp = ""
	for i in words:
		temp = temp + "ug" + i

	output.append(temp)
file.close()

file = open("ugtest.txt", "w")
file.writelines(output)
file.close()

Suggested changes - Count the number of words seen in the file opened.

file = open("test.txt", "r")
output = []
wordCount = 0
for line in file.readlines():
	words = line.split()
	temp = ""
	for i in words:
		temp = temp + "ug" + i
		wordCount += 1

	output.append(temp)
file.close()

file = open("ugtest.txt", "w")
file.writelines(output)
file.close()

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