FREE PCEP Variable Scope and the `global` keyword Questions and Answers

Question 1

What is the output of the following code?

```python
var = 100

def my_func():
    var = 50
    print(var)

my_func()
print(var)
```

Accepted Answer

50
100

Answer

100
50

Answer

50
50

Answer

100
100

Question 2

What is the output of this code snippet?

```python
var = 100

def my_func():
    global var
    var = 50

my_func()
print(var)
```

Accepted Answer

50

Answer

100

Answer

An error occurs.

Answer

None

Question 3

What is the scope of a variable defined inside a function, without using the `global` keyword?

Accepted Answer

Local scope

Answer

Global scope

Answer

Universal scope

Answer

It has no scope.

Question 4

What is the output of the following code?

```python
value = 1

def change_value():
    print(value)

change_value()
```

Accepted Answer

1

Answer

None

Answer

An UnboundLocalError occurs.

Answer

A NameError occurs.

Question 5

What happens when this code is executed?

```python
def my_func():
    global new_var
    new_var = 'Hello'

my_func()
print(new_var)
```

Accepted Answer

The code prints 'Hello'.

Answer

A NameError occurs because `new_var` is not defined globally.

Answer

A SyntaxError occurs.

Answer

The code runs, but prints nothing.

Question 6

What is the result of running this code?

```python
a = 10

def func(a):
    a = 5
    return a

print(func(a))
print(a)
```

Accepted Answer

5
10

Answer

5
5

Answer

10
5

Answer

10
10

Question 7

What kind of error will this code produce?

```python
count = 0

def increment():
    count = count + 1

increment()
```

Accepted Answer

UnboundLocalError

Answer

NameError

Answer

TypeError

Answer

No error, the code runs fine.