7.14. Multiple Choice Questions

11-9-1: What is printed by the following statements?

s = "python rocks"
print(s[1] * s.index("n"))

• yyyyy
• Correct! s[1] = y and the index of n is 5, so y * 5 prints 5 y characters.
• 55555
• Incorrect! s.index("n") = 5, but it is multiplying something else. Try again.
• y5
• Incorrect! The print statement contains multiplication. Try again.
• TypeError
• Incorrect! Multiplying a string by an int is allowed. Try again.

11-9-2: What will be printed when the following executes?

str = "His shirt is red"
pos = str.find("is")
print(pos)

• 1
• Correct! The find function returns the index of the first position that contains the given string.
• 9
• Incorrect! The find function returns the index of the FIRST position that contains the given string. Try again.
• 2
• Incorrect! Remember, indices start at 0, not 1. Try again.
• pos
• Incorrect! pos is a variable, so print will print its value. Try again.

11-9-3: What will be printed when the following executes?

str = "This is fun"
str = str[5]
print(str)

• i
• Correct! This will print the character at position 5 in the string, which is i.
• ' '
• Incorrect! Remember, indices start at 0. Try again.
• is fun
• Incorrect! str[5] equals one specific character of the larger string. Try again.
• This is fun
• Incorrect! Line 2 permanently changes the value that the variable str is assigned to. Try again.

11-9-4: What is the value of s1 after the following code executes?

s1 = "heY"
s1 = s1.capitalize()
s1.lower()

• heY
• Incorrect! Although strings are immutable, s1 gets reassigned to a different value than it begins with. Try again.
• hey
• Incorrect! Strings are immutable, so line 3 just returns a new string and doesn't modify the original. Try again.
• HEY
• Incorrect! The capitalize method doesn't capitalize the entire word. Try again.
• Hey
• Correct! The capitalize method capitalizes the first letter of the word and lowercases the rest. Then, line 3 returns a new string without modifying the original.

11-9-5: What would the following code print?

Mali = 5
print("Mali" + " is " + str(Mali))

• Mali is Mali
• Incorrect! There are no quotes around the last Mali, so str() will use the value of the variable Mali. Try again.
• Mali is 5
• Correct! The first Mali is in quotes, so it will print the string "Mali". The second Mali is not in quotes, so it will print the value of the variable Mali.
• 5 is Mali
• Incorrect! The first Mali is in quotes and the second is not. Try again.
• 5 is 5
• Incorrect! The first Mali is in quotes, so it is a string, not a variable. Try again.

11-9-6: What is printed by the following statements?

s = "python rocks"
print(s[3])

• t
• Incorrect! Indices start at 0, not 1. Try again.
• h
• Correct! Indices start with 0.
• c
• Incorrect! s[-3] would count from right to left and return c. Try again.
• Error, you cannot use the [ ] operator with a string.
• Incorrect! [ ] is the index operator and works with strings. Try again.

11-9-7: What is printed by the following statements?

s = "python is awesome"
print(s[2] + s[-5])

• te
• Correct! The indexing operator has precedence over concatenation.
• tw
• Incorrect! s[-1] is the last character of the string, so what is s[-5]? Try again.
• o
• Incorrect! The indexing operator happens before the two strings are concatenated. Try again.
• Error, you cannot use the [ ] operator with the + operator.
• Incorrect! [ ] operator returns a string that can be concatenated with another string. Try again.

11-9-8: What is printed by the following statements?

s = "python rocks"
print(len(s))

• 11
• Incorrect! The space counts as a character. Try again.
• 12
• Correct! len() returns the number of characters in the string, including spaces.
• 1
• Incorrect! s is a variable, not a character. Try again.
• Error, missing quotes around s
• Incorrect! Because s is the name of a string variable, len() can be used on it. Try again.

11-9-9: What is printed by the following statements:

s = "Rose"
s[1] = "i"
print(s)

• Rose
• Incorrect! Assignment is not allowed with strings. Try again.
• Rise
• Incorrect! Assignment is not allowed with strings. Try again.
• s
• Incorrect! Assignment is not allowed with strings. Try again.
• TypeError
• Correct! Strings are immutable, so you cannot change an existing string.

11-9-10: What is printed by the following statements:

s = "ball"
r = ""
for item in s:
    r = item.upper() + r
print(r)

• Ball
• Incorrect! Each item is converted to upper case before concatenation. Try again.
• BALL
• Incorrect! Pay close attention to the order the characters will be in. Try again.
• LLAB
• Correct! The order is reversed due to the order of the concatenation.
• TypeError
• Incorrect! String concatenation is allowed. Try again.

11-9-11: What is printed by the following statements?

s = "python rocks"
print(s[7:11] * 3)

• rockrockrock
• Correct! s[7:11] = "rock", which is then repeated 3 times.
• rock rock rock
• Incorrect! s[7:11] is "rock", not " rock". Try again.
• rocksrocksrocks
• Incorrect! Slicing will not include the character at index 11, just the characters up to it. Try again.
• TypeError, you cannot use multiplication with slicing.
• Incorrect! Multiplying a string by an int is okay. Try again.

11-9-12: What is printed by the following statements?

animal = "dog"
print("animal" + animal)

• dogdog
• It will print "animal" first.
• dog dog
• There is no added space.
• animal dog
• There is no added space.
• animaldog
• Correct! It will print the characters in the string followed by the value of the variable animal without any space between.

11-9-13: What is printed by the following statements?

animal = "dog"
print("animal " + "animal")

• animal animal
• Since animal is in quotes it will print those exact letters.
• animalanimal
• There is a space in the first string.
• animal dog
• Notice that the second animal is also in quotes.
• animaldog
• Notice that the second animal is also in quotes and there is a space after the first string.

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