Multiple Choice Questions -list & Dictionary

The correct answer is [3, 4, 5, 20, 5, 25, 1, 3, 34, 5]. After the listExample.extend([34, 5]) operation, the elements [34, 5] are added to the end of the listExample. Therefore, the resulting list1 will be [3, 4, 5, 20, 5, 25, 1, 3, 34, 5].

The reverse() method in Python reverses the order of elements in a list. So, after applying list1.reverse(), the list1 will be reversed and the elements will be in the order [3, 1, 25, 5, 20, 5, 4, 3].

The correct answer is 12454 because it is the highest number in the given list, which consists of four numbers.

The correct answer is 15 because the sum of the numbers in list1 [1, 5, 9] is 1 + 5 + 9 = 15.

The correct answer is list1.append(5). This is because the append() function is specifically designed to add elements to the end of a list. The add() function is not a valid command for adding elements to a list. Similarly, addLast() and addEnd() are not standard commands in Python for adding elements to a list. Therefore, list1.append(5) is the correct command to use in this case.

The len() function in Python returns the length of a list, which is the number of elements in the list. In this case, the listExample contains 5 elements: 'h', 'e', 'l', 'l', and 'o'. Therefore, the length of listExample is 5.

The code first concatenates list1 and list2 using the + operator, resulting in a new list [1, 2, 3, 4, 5, 6, 7, 8]. The len() function is then used to determine the length of this new list, which is 8. Therefore, the output of the code will be 8.

All three statements create a dictionary. In the first statement, an empty dictionary is created with no key-value pairs. In the second statement, a dictionary is created with two key-value pairs, "john" with a value of 40 and "peter" with a value of 45. In the third statement, a dictionary is created with two key-value pairs, 40 with a value of "john" and 45 with a value of "peter". Therefore, all of the mentioned statements create a dictionary.

The correct answer is 25 because list1[-1] refers to the last element in the list, and in this case, the last element is 25.

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The output of the given code snippet will be "true". This is because the code checks if the key "john" exists in the dictionary "d". Since "john" is one of the keys in the dictionary, the condition is satisfied and the output is "true".

The "in" operator can be used to check if an item is in lists, dictionaries, and sets. In lists, it checks if the item is present in the list. In dictionaries, it checks if the item is a key in the dictionary. In sets, it checks if the item is an element in the set. Therefore, the correct answer is that the "in" operator can be used to check if an item is in all of the mentioned data structures.

The correct answer is [1, 3, 2, 1, 3, 2] because when you multiply a list by a number, it repeats the elements of the list that number of times. In this case, multiplying list1 by 2 repeats the elements of list1 twice, resulting in [1, 3, 2, 1, 3, 2].

After executing the code listExample.pop(1), the element at index 1 (which is 4) is removed from the list. The resulting list will be [3, 5, 20, 5, 25, 1, 3].

All of the mentioned commands will create a list. The first command "list1 = list()" creates an empty list using the list() constructor. The second command "list1 = []" creates an empty list using square brackets. The third command "list1 = list([1, 2, 3])" creates a list with elements 1, 2, and 3 using the list() constructor. Therefore, all of these commands will create a list.

Executing the command list("hello") will convert the string "hello" into a list of individual characters: ['h', 'e', 'l', 'l', 'o'].

The code is using the split() method to split the string "a#b#c#d" at each occurrence of the "#" character. This will result in a list of substrings ['a', 'b', 'c', 'd']. Therefore, the correct answer is [‘a’, ‘b’, ‘c’, ‘d’].

The code snippet is creating a dictionary named 'a' with three key-value pairs. The 'del' keyword is then used to delete the dictionary 'a'. Therefore, the output of the code will be that the entire dictionary 'a' will be deleted.

The given Python code uses the split() function on the string "Welcome to Python". The split() function splits the string into a list of substrings based on the specified delimiter, which is a space in this case. Therefore, the output of the code will be a list containing the substrings "Welcome", "to", and "Python".

list1[:-1] is a slicing operation on list1. In Python, slicing allows us to extract a portion of a list. The syntax for slicing is list[start:end], where start is the index of the first element to include and end is the index of the first element to exclude. In this case, list1[:-1] means to slice the list from the beginning to the second last element, excluding the last element. So, the correct answer is [2, 33, 222, 14].

The correct answer is "john" and "peter". This is because the code snippet defines a dictionary named 'd' with two key-value pairs: "john":40 and "peter":45. When we access the keys of the dictionary using the 'd.keys()' method, it returns an iterable containing the keys "john" and "peter".

A dictionary in Python is a data structure that stores key-value pairs. The statement "The keys of a dictionary can be accessed using values" is false because in a dictionary, the values can be accessed using keys, but not the other way around. The keys are unique and act as identifiers for the corresponding values. Therefore, it is not possible to directly access keys using values in a dictionary.

A dictionary in Python allows multiple keys to have the same value. This means that more than one key can have the same value, making the statement "Values of a dictionary must be unique" false.

The code snippet defines a dictionary 'a' with key-value pairs. The for loop iterates over the items of the dictionary, where 'i' represents the key and 'j' represents the value. Inside the loop, it prints 'i' and 'j' with a space in between, using the 'end' parameter to prevent a new line after each print statement. Therefore, the output will be "1 A 2 B 3 C", as it prints the keys and values of the dictionary separated by a space.

The correct answer is {1,”A”,2”B”} because it is missing the colon (:) between the keys and values in the dictionary. In Python, a dictionary declaration should have the format {key: value}.

The popitem() method in a dictionary removes an arbitrary key-value pair from the dictionary. It does not remove all the key-value pairs or a specific key-value pair for a given key. This method is a valid method for dictionaries.

The code snippet creates a dictionary named "a" with key-value pairs 1:"A", 2:"B", and 3:"C". The "get" method is used to retrieve the value associated with the key 1 from the dictionary. Since the key 1 exists in the dictionary, the method returns the value "A". Therefore, the output of the code will be "A".

The code snippet creates a dictionary 'a' with keys 1, 2, and 3 mapped to values "A", "B", and "C" respectively. The print statement uses the get() method to retrieve the value corresponding to key 5 from the dictionary. Since the key 5 does not exist in the dictionary, the get() method returns the default value provided as the second argument, which is 4. Therefore, the output of the code will be 4.