Python Basics Test

Front

Which operator is generally faster, is or ==, and why?

Back

is, because it only compares memory addresses

Answer explanation

• is only checks if two variables point to the same object in memory → Faster
  

==compares values, which can be slower if objects are large (like lists or dictionaries).

Front

What is Python?

Back

A high-level programming language

Front

What is the output of print(2 + 3 * 4)?

Back

14

Front

Which of the following statements is used to exit from a loop in Python? stop, exit, break, end

Back

break

Front

What will be the output of the following code?
x = [1, 2, 3]
x.append([4, 5])
print(x)

Back

[1, 2, 3, [4, 5]]

Front

Which of the following is the best way to check if a variable is None?
if x == None:
if x is None:
if x == "None":
if x is "None":

Back

if x is None:

Front

What will be printed?
python
CopyEdit
t1 = (1, 2, 3)
t2 = (1, 2, 3)
l1 = [1, 2, 3]
l2 = [1, 2, 3]
print(t1 is t2)
print(l1 is l2)

Back

True, False

Front

What will be the output?
python
CopyEdit
a = [1, 2, 3]
a[0] = 100
print(a)
b = (1, 2, 3)
b[0] = 100
print(b)

Back

[100, 2, 3] and TypeError

Front

What will this function return when called multiple times?
def add_element(lst=[]):
lst.append(1)
return lst
print(add_element()) # (1)
print(add_element()) # (2)
print(add_element()) # (3)

Back

[1], [1, 1], [1, 1, 1]

Front

How do you open a file in read mode in Python? Options: open('file.txt', 'w'), open('file.txt', 'r'), open('file.txt', 'rw'), readfile('file.txt', 'r')

Back

open('file.txt', 'r')