Python String Reversal: Without Built-in Functions

Here's a Python code snippet to reverse a string without utilizing any built-in functions:

# Take input string from the user
string = input('Enter a string: ')

# Initialize an empty string to store the reversed string
reversed_string = ''

# Loop through the string in reverse order and append each character to the reversed string
for i in range(len(string)-1, -1, -1):
    reversed_string += string[i]

# Print the reversed string
print('Reversed string:', reversed_string)

In this program, we begin by prompting the user to enter a string. Then, we create an empty string to hold the reversed version. We iterate through the input string backwards using a loop, adding each character to the reversed_string. Finally, we display the reversed string using the print() function.