Python String Basics Quiz

In most programming languages, string indexes start at 0, and Python is no exception. For more details, please refer to Python String Basics.

s = 'Hello'

When a string is denoted using quotation marks, it's termed as a string literal; as in the code above. Hence, the correct choice is (A).

The strings 'Hello' and "Hello" are defined in different ways — one using single quotes and the other using double quotes — however they denote exactly the same piece of information. In other words, they are identical to each other.

s = 'Python's call!'

The problem is that the string s, which is defined using ' (single quotes), contains a single quote itself. This can be rectified by either escaping this quote character using a backslash or by simply using a multiline string. Hence, the correct choice is (D).

For more specific details, please refer to Python String Basics — escaping characters and Python String Basics — multiline strings.

A multiline string can be denoted by a pair of triple-single-quotes ('''Hello World!''') or triple-double-quotes ("""Hello World!"""). Hence, the correct choice here is (C). For more details on multiline strings, refer to Python String Basics — multiline strings.

From a string s, a given character can be accessed via bracket notation — putting the index of the desired character within the pair of brackets. To access the second character, for example, we'll write s[1]. Hence, the correct choice is (C).

len(' Hello')

When given a string, the len() function in Python returns the numbers of characters in it. In this case, it returns 6, and this goes with choice (B).

The last character of a string s can be accessed directly using s[-1], or by using s[len(s) - 1], realising the fact that the last character is at an index one lesser than the length of the string. This goes with choice (D).

s = 'Hello'
print(s[1:3])

The expression s[1:3] slices the string s from index 1 exactly upto index 2 (not 3, since it is exclusive), to yield the substring 'el'. The correct choice is, therefore, (A). Read more at Python String Basics — slicing a string.

The * operator, when used on string, replicates the strings a given number of times. Read more details at Python String Basics — string replication.

Strings that are preceded by an r are commonly known as raw strings. They prevent the need to escape backslashes — just write them, as is. To learn more about them, refer to Python String Basics — raw strings.

For more details, please refer to Python String Basics — raw strings.