Exercise 6 (with comments)

ex6_b.py

#assign a String to the variable x. The String is a formatted String 
#where we replace %d with 10
x = "There are %d types of people." % 10

#assign the variable 'binary' with a value which is a String 'binary'
binary = "binary"

#assign a String to the variable do_not
do_not = "don't"

#assign a String to the variable y. This is a formatted String which has
#two replecement variables
#This is the first place where a String is put inside a String
y = "Those who know %s and those who %s." % (binary, do_not)

#print the value of the variable x
print x

#print the value of the variable y
print y

#print the specified String which also contains a replacement
#In this case we use the %r formatting character, which will 
#be replaced witht the String representation of the specified object
#This is the second place where a String is put inside a String
print "I said: %r" % x

#print the specified String, which contains a replacement value
#This is the third place where a String is put inside a String
print "I also said: '%s'." % y

#set the variable 'hilarious' to the boolean value False
hilarious = False

#Set the variable 'joke_evaluation' to the String containing a replacement
#value. We do not specify the replacement here. It will be specified 
#when we use the String
joke_evaluation = "Isn't that joke so funny?! %r"

#print the value of the String 'joke_evaluation' and use the value of
#the String 'hilarious' as a replacement
#This is the fourth place where a String is put inside a String
print joke_evaluation % hilarious

#assign a String value to the variable 'w'
w = "This is the left side of..."

#assign a String value to the variable 'e'
e = "a string with a right side."

#concatanate w and e and print the result
print w + e