Foundations-of-Programming-Python Exam Questions & Answers

Awhile looprepeatedly executes a block of code as long as its condition remains true.

Example:

count = 1

while count <= 3:

print(count)

count += 1

In this example, Python checks the condition count <= 3 before each loop iteration. If the condition is true, the loop continues. When the condition becomes false, the loop stops.

A for loop is usually used to iterate over a sequence, such as a list, string, or range. Python does not have a built-in repeat loop construct.

Therefore, the correct answer isB. while loop.

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Step 1: A default parameter value allows a function to be called even when no argument is provided.

Step 2: The default value should be added in the function header.

Step 3: The parameter name should have the default value 'World'.

Correct code:

def greet_with_default(name='World'):

return 'Hello ' + name

Example:

print(greet_with_default())

print(greet_with_default('Alice'))

Output:

Hello World

Hello Alice

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Step 1: Python string slicing uses this format:

text[start:stop]

Step 2: The start index is included.

Step 3: The stop index is excluded.

Step 4: To return the first 3 characters, start at index 0 and stop at index 3.

Correct code:

def first_three(text):

return text[0:3]

Simplified correct code:

def first_three(text):

return text[:3]

Example:

print(first_three('Python'))

Output:

Pyt

In the loop:

for item in my_list:

print(item)

item represents the current element from my_list during each loop iteration.

For example:

my_list = ['apple', 'banana']

for item in my_list:

print(item)

The loop first processes 'apple', then 'banana'. Python's documentation explains that a for statement iterates over the items of a sequence in order.

Therefore, the correct answer isB. The current element being processed.

Python strings are sequences, and sequence values can be accessed using indexing and slicing.

The first character in a Python string has index 0. To extract the first four characters from 'computer', the slice should start at index 0 and stop at index 4.

Example:

'computer'[0:4]

Result:

'comp'

In Python slicing, the start index is included, but the stop index is excluded. So [0:4] includes characters at indexes 0, 1, 2, and 3.

The official Python documentation explains that slicing with a[start:stop] selects items from the start index up to, but not including, the stop index.

Therefore, the correct answer is A. 'computer'[0:4].