Which of the following statements is false?
a. List comprehensions provide a concise and convenient notation for creating new lists.
b. List comprehensions can replace many for statements that iterate over ex-isting sequences and create new lists, such as:
list1 = []
for item in range(1, 6):
We can accomplish the same task in a single line of code with a list comprehen-sion:
list2 = [item for item in range(1, 6)]
c. The preceding list comprehension’s for clause iterates over the sequence produced by range(1, 6). For each item, the list comprehension evaluates the expression to the left of the for clause and places the expression’s value (in this case, the item itself) in the new list.
d. All of the above statements are true.
d. All of the above statements are true.
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________ refers to an empty cell
A) Count B) Zero C) Null D) Circular reference
State which of the following schedules are serializable.
a. r1(x) r2(y) r1(z ) r3(z ) r2(x) r1(y) b. r1(x) w2(y) r1(z ) r3(z ) w2(x) r1(y) c. r1(x) w2(y) r1(z ) r3(z ) w1(x) r2(y) d. r1(x) r2(y) r1(z ) r3(z ) w1(x) w2(y) e. r1(x) r2(y) w2(x) w3(x) w3(y) r1(y) f. w1(x) r2(y) r1(z ) r3(z ) r1(x) w2(y) g. r1(z ) w2(x) r2(z ) r2(y) w1(x) w3(z ) w1(y) r3(x)