Step by Step solution about How to resolve the algorithm Interactive programming (repl) step by step in the Python programming language

The Python code defines a function f that takes three arguments: two strings, string1 and string2, and a separator string, separator. The function returns a new string that is the result of joining the two input strings with the separator string in between.

Here's a step-by-step breakdown of how the function works:

1. The function starts by initializing a new variable called result and assigning it an empty string.

2. The function then uses a for loop to iterate over the characters in the first input string, string1. For each character in string1, the function appends the character to the result variable.

3. After the loop has finished, the function appends the separator string to the result variable.

4. The function then uses another for loop to iterate over the characters in the second input string, string2. For each character in string2, the function appends the character to the result variable.

5. Finally, the function returns the result variable, which contains the two input strings joined together with the separator string in between.

Here are a few examples of how the f function can be used:

>>> f('Rosetta', 'Code', ':')
'Rosetta::Code'

>>> f('Hello', 'World', ' ')
'Hello World'

>>> f('1', '2', '+')
'1+2'

python
Python 2.6.1 (r261:67517, Dec  4 2008, 16:51:00) [MSC v.1500 32 bit (Intel)] on
win32
Type "help", "copyright", "credits" or "license" for more information.
>>> def f(string1, string2, separator):
	return separator.join([string1, '', string2])

>>> f('Rosetta', 'Code', ':')
'Rosetta::Code'
>>>