Test: Strings - 1 - Software Development MCQ

In Python, strings can be defined using single quotes ('') or double quotes (""). Option (b) demonstrates the correct way to define a string.

The slicing notation str[start:end] is used to extract a substring from a string. In this case, str[1:4] returns the characters at indices 1, 2, and 3, resulting in "yth".

The upper() method is used to convert a string to uppercase in Python. It returns a new string with all alphabetic characters converted to uppercase.

The + operator is used for concatenating strings in Python. In this case, it concatenates the strings "Python" and "Programming" to form "PythonProgramming".

The len() function returns the length of a string in Python. It can be used to determine the number of characters in a string.

The + operator is used to concatenate strings in Python. In this case, it concatenates the strings "Hello" and "World" to form "HelloWorld".

In Python, strings can be accessed using indexing. The index starts from 0, so str[7] refers to the character at index 7, which is "P".

Negative indexing is used to access characters from the end of a string. str[-2:] returns the last two characters of the string "Python", which are "on".

The split() method splits a string into a list of substrings based on whitespace by default. In this case, it splits the string "Hello World" into the list ['Hello', 'World'].

The replace() method replaces occurrences of a specified substring with another substring in a string. In this case, it replaces "Python" with "Java" in the string "Python Programming".

The slicing notation [::-1] is used to reverse a string in Python. In this case, it reverses the string "Hello World" to become "dlroW olleH".

The index() method returns the index of the first occurrence of a specified substring within a string. In this case, it returns the index of the substring "Prog" in the string "Python Programming", which is 11.

String comparisons are case-sensitive in Python. In this case, "Hello" and "hello" are different strings, so the comparison str1 == str2 evaluates to False.

The count() method returns the number of occurrences of a specified substring in a string. In this case, it counts the number of occurrences of the letter "P" in the string "Python Programming", which is 1.

The startswith() method returns True if a string starts with a specified substring. In this case, "Hello World" starts with "Hello", so the result is True.