Python PCEP-30-02 Certification Preparation

1 / 30

If you assign a new value to an existing variable in Python, what happens to the old value?

The old value is overwritten and lost.

An error is raised because you can't change a variable's value.

The old value is retained for future use.

The old value is automatically backed up.

When you reassign a value to a variable, the old value is replaced by the new value. Python's garbage collector will eventually reclaim the memory used by the old value if it's no longer referenced elsewhere.

2 / 30

What is the output of:

x = 10
y = 3
print(x % y * 2 ** 2)

3 / 30

What will this code print:

x = 100
print(isinstance(x, int) and x > 0 and x % 2 == 0)

100

False

True

4 / 30

What will this code print:

x = 15 # 0b1111
y = 10 # 0b1010
print(x & y, x | y, x ^ y)

5 25 15

10 15 5

10 25 15

5 15 10

5 / 30

Which of the following is a valid variable name in Python?

2_variable

class

my-variable

_hidden_var

6 / 30

What is the main purpose of using comments in Python code?

To explain the purpose and functionality of the code.

To hide sensitive information from other developers.

To automatically generate documentation for the code.

To make the code execute faster.

Comments are for humans, not the computer. They are used to clarify what the code is doing, why it's doing it, and to provide context for other developers (or your future self) who might read the code. Good comments make the code easier to understand and maintain.

7 / 30

Given the following lists:

names = ["Alice", "Bob", "Charlie"]
ages = [25, 30, 28]

for i in range(len(names)): print(names[i], ages[i])

for name in names: for age in ages: print(name, age)

for i, (name, age) in enumerate(names, ages): print(name, age)

for name, age in zip(names, ages): print(name, age)

8 / 30

What is the result of:

x = 300
y = 300
z = 300
print(x is y, y is z)

False True

True False

False False

True True

9 / 30

How would you remove all the items from the d dictionary?

d = {'A' : 1, 'B' : 2, 'C' : 3}

d.clear()

del d

d.del()

d.remove()

10 / 30

What will this code print:

x = 10
x += x //= 2
print(x)

SyntaxError

11 / 30

What will be printed:

x = [1, 2, 3]
y = [1, 2, 3]
z = x
print(x == y, x is y, x is z)

True True True

True False True

True True False

False False True

12 / 30

What will be the output of the following code snippet?

a = [1, 2, 3, 4, 5, 6, 7, 8, 9]

print(a[::2])

[1, 3, 5, 7, 9]

[1, 2, 3]

[1, 2]

[8, 9]

13 / 30

What will be the output of the following code snippet?

a = [1, 2, 3, 4, 5, 6, 7, 8, 9]

print(a[::2])

[1, 2]

[1, 3, 5, 7, 9]

1, 2, 3]

[8, 9]

14 / 30

What is the result of:

print(~0, ~-1, ~1)

-1 0 -2

0 1 -1

-1 1 -1

1 0 2

15 / 30

What is the output of:

x = [1]
x *= 2
x[0] += x[1]
print(x)

[2, 2]

[2, 1]

[1, 1]

[1, 2]

16 / 30

What does range(2, 10, 2) generate?

A sequence of numbers starting from 2, up to (but not including) 10, with a step of 2.

An error, because the arguments are invalid.

A list of numbers from 2 to 10 (inclusive).

A single number, the average of 2 and 10.

17 / 30

What is the output of:

s = 'Python'
print(s.center(10, '*'), len(s.center(10, '*')))

**Python* 9

***Python*** 12

**Python** 10

*Python*** 10

18 / 30

What will be printed:

print(int('0b1010', 2), int('0o12', 8), int('0xA', 16))

10 10 10

2 8 16

ValueError

1010 12 A

19 / 30

What will this code print:

x = 1
del x
try:
print(x)
except NameError:
print('Error')

Error

None

20 / 30

What will this code print:

print(bool(0) == False, 0 == False, bool(0) is False)

False True True

True False True

True True False

True True True

21 / 30

What is the output of:

print(format(20, 'b'), format(20, 'o'), format(20, 'x'), format(20, 'd'))

10100 024 0x14 20

10100 24 14 20

20 20 20 20

0b10100 0o24 0x14 20

22 / 30

If range(5) is used in a for loop, how many times will the loop body be executed?

0 times

5 times

4 times

1 time

23 / 30

What will this code print:

x = 5
y = -x
z = +y
print(x + y + z)

-5

24 / 30

What will be the output of the following code snippet?

d = {}

d[1] = 1

d['1'] = 2

d[1] += 1

sum = 0

for k in d:

sum+= d[k]

print(sum)

25 / 30

What will be printed:

x = 0xFF
y = int('FF', 16)
print(x == y, x)

True 0xFF

True FF

False 255

True 255

26 / 30

What is the output of:

print('abc' < 'abd', 'abc' <= 'abc', 'Z' > 'a')

True False True

False True True

True True False

True True True

27 / 30

What will be printed:

x = 'A'
x *= 2
x += 'B' * 3
print(x)

ABB

AAB

AABBB

AAABBB

28 / 30

What will be the output of the following Python code?

x = 5
while x > 0:
print(x)
x -= 1
else:
print("Loop finished")

Loop finished

5 4 3 2 1

5 4 3 2 1 Loop finished

An error will occur

The loop prints the value of x as long as x is greater than 0. The else block associated with the while loop is executed only when the loop finishes normally (i.e., the condition becomes False), not if it's terminated by a break statement.

29 / 30

What will this code print:

x = 'abc' * -1
print(len(x))

TypeError

-3

ValueError

30 / 30

What is the output of:

x = 1.5e3
y = 15e2
z = 1500.0
print(x == y == z)

False

TypeError

SyntaxError

True

Your score is