The Final Challenge

# Challenge 1 — Mark Scheme (with subroutine)

def analyse_line(line):
    """Subroutine to analyse a single line and return a report string"""
    upper_ver  = line.upper()
    length     = len(line)
    first      = line[0] if line else "-"
    last       = line[-1] if line else "-"
    all_alpha  = line.replace(" ", "").isalpha()
    report = f"Original : {line}\n"
    report += f"Upper    : {upper_ver}\n"
    report += f"Length   : {length} | First: {first} | Last: {last}\n"
    report += f"Alpha?   : {all_alpha}\n---\n"
    return report

# Main program
infile  = open("input.txt", "r")
outfile = open("output.txt", "w")

for line in infile:
    line = line.strip()
    outfile.write(analyse_line(line))

infile.close()
outfile.close()

# Challenge 2 — Mark Scheme (with subroutine)

def search_line(line, keyword):
    """Subroutine that searches for a keyword in a line (case-insensitive)"""
    line_lower = line.lower()
    key_lower  = keyword.lower()
    if key_lower in line_lower:
        position = line_lower.find(key_lower)
        return True, position
    return False, -1

# Main program
keyword    = input("Search for: ")
infile     = open("input.txt", "r")
outfile    = open("output.txt", "w")
count      = 0
total_chars= 0
first_pos  = -1

for line in infile:
    line = line.strip()
    found, pos = search_line(line, keyword)
    if found:
        count += 1
        total_chars += len(line)
        if count == 1:
            first_pos = pos
        outfile.write(line.upper() + "\n")

infile.close()
outfile.close()

if count == 0:
    print("No matches found.")
else:
    print(f"Matches: {count}")
    print(f"Total chars in matches: {total_chars}")
    print(f"Keyword first found at index: {first_pos}")

# Challenge 3 — Mark Scheme (with subroutines)

def count_chars(line):
    """Counts letters, digits, and spaces in a line"""
    letters = 0
    digits  = 0
    spaces  = 0
    for ch in line:
        if ch.isalpha(): letters += 1
        elif ch.isdigit(): digits += 1
        elif ch.isspace(): spaces += 1
    return letters, digits, spaces

def write_line_report(outfile, num, line, letters, digits, spaces):
    """Writes a formatted report for one line"""
    outfile.write(f"Line {num}: {line}\n")
    outfile.write(f"  Len:{len(line)} | Letters:{letters} | Digits:{digits} | Spaces:{spaces}\n")
    outfile.write(f"  First 5: {line[0:5]} | Has digits: {digits > 0}\n\n")

def write_summary(outfile, line_count, total_letters, total_digits, alpha_lines, longest):
    """Writes the final summary section"""
    outfile.write("=== SUMMARY ===\n")
    outfile.write(f"Total lines    : {line_count}\n")
    outfile.write(f"Total letters  : {total_letters}\n")
    outfile.write(f"Total digits   : {total_digits}\n")
    outfile.write(f"Alpha-only lines: {alpha_lines}\n")
    outfile.write(f"Longest line   : {longest}\n")

# Main program
infile    = open("input.txt", "r")
outfile   = open("output.txt", "w")
longest   = ""
alpha_lines= 0
total_letters = 0
total_digits  = 0
line_count    = 0

for line in infile:
    line    = line.strip()
    line_count += 1
    letters, digits, spaces = count_chars(line)
    total_letters += letters
    total_digits  += digits
    if digits == 0: alpha_lines += 1
    if len(line) > len(longest): longest = line
    write_line_report(outfile, line_count, line, letters, digits, spaces)

write_summary(outfile, line_count, total_letters, total_digits, alpha_lines, longest)
infile.close()
outfile.close()

# Challenge 4 — Mark Scheme

def uppercase_all():
    infile = open("input.txt", "r")
    outfile = open("output.txt", "w")
    for line in infile:
        outfile.write(line.strip().upper() + "\n")
    infile.close()
    outfile.close()
    print("Done! All lines converted to uppercase.")

def count_words():
    infile = open("input.txt", "r")
    total = 0
    for line in infile:
        words = line.strip().split()
        total += len(words)
        print(f"{line.strip()} → {len(words)} words")
    infile.close()
    print(f"Total words: {total}")

def find_digits():
    infile = open("input.txt", "r")
    for line in infile:
        line = line.strip()
        count = 0
        for ch in line:
            if ch.isdigit(): count += 1
        if count > 0:
            print(f"{line} → {count} digits")
    infile.close()

def keyword_search():
    keyword = input("Enter keyword: ")
    infile = open("input.txt", "r")
    count = 0
    for line in infile:
        if keyword.lower() in line.lower():
            print(f"Found: {line.strip()}")
            count += 1
    infile.close()
    print(f"Total matches: {count}")

# Main menu loop
running = True
while running:
    print("\n=== Text Tool Menu ===")
    print("1. Convert all to UPPERCASE")
    print("2. Count words per line")
    print("3. Find lines with digits")
    print("4. Search for a keyword")
    print("5. Quit")

    choice = input("Choose (1-5): ")

    if choice == "1": uppercase_all()
    elif choice == "2": count_words()
    elif choice == "3": find_digits()
    elif choice == "4": keyword_search()
    elif choice == "5": running = False
    else: print("Invalid choice. Try again.")