I'm writing a function that is supposed to decode an inputted NRZ scheme. My professor also prohibited any usages of import libraries. Here's my code so far. def nrz_encoding(input_scheme): # Split the input into lines and convert each line into a list of characters nrz_scheme = [list(line) for line in input_scheme.strip().split('\n')] index = 0 nrz_output = '' # Identify the first and last rows first_row = nrz_scheme[0] last_row = nrz_scheme[3] # Determine the starting row (first or last) based on the leftmost underscore if first_row[0] == "_": current_row = first_row elif last_row[0] == "_": current_row = last_row else: raise ValueError("Please make sure that there's no spaces at the start of your leftmost underscore(_).") # Determine the maximum length of the rows max_length = max(len(first_row), len(last_row)) while index < max_length: # Determine the current row based on the signal level if index < len(first_row) and first_row[index] == "_": current_row = first_row elif index < len(last_row) and last_row[index] == "_": current_row = last_row # Translate the signal level to 0 or 1 if current_row is first_row: nrz_output += "0" else: nrz_output += "1" index += 3 # Check for a transition (vertical bar) if index < len(nrz_scheme[1]) and nrz_scheme[1][index] == "|": # Switch the current row if current_row is first_row: current_row = last_row else: current_row = first_row # Move past the transition character index += 1 return nrz_output I don't know why but it works for some test cases but not others. Like this one: nrz_input = """ ______ | | | | ___| |___ """ The input above should spit out a 0110 based on the scheme. But my code outputs a 1000. I don't really know why either. Also, I should note that I'm fairly new to coding. Continue reading...
