Which of the following will delete key_value pair for key="tiger" in dictionary?

di = {"lion":"wild","tiger":"wild","cat": "domestic", "dog":"domestic"}

1. del di["tiger"]
2. di["tiger"].delete( )
3. delete(di["tiger"])
4. del(di.["tiger"])

Which of the following will give error if d1 is as shown below?

d1 = {"a":1, "b":2, "c":3}

1. print(len(d1))
2. print(d1.get("b"))
3. d1["a"] = 5
4. None of these

What will be the output of following Python code?

d1 = {"a":10,"b":2,"c":3}
str1=""
for i in d1:
    str1 = str1 + str(d1[i]) + " " 
    str2 = str1[:-1]
print(str2[::-1])

1. 3, 2
2. 3, 2, 10
3. 3, 2, 01
4. Error

Running the code sorted(mydictionary, reverse = True) on a dictionary named mydictionary will return results sorted in what order?

1. Ascending order (A-Z), by key
2. Ascending order (A-Z), by value
3. Descending order (Z-A), by key
4. Descending order (Z-A), by value