Diferença de Texto

import difflib

def line_diff(original: str, modified: str) -> list[str]:
    """Return unified diff lines between two multi-line strings."""
    orig_lines = original.splitlines(keepends=True)
    mod_lines  = modified.splitlines(keepends=True)
    return list(difflib.unified_diff(
        orig_lines, mod_lines,
        fromfile="original", tofile="modified",
        lineterm=""
    ))

def side_by_side_diff(original: str, modified: str):
    """Yield (tag, line_a, line_b) tuples for a side-by-side view."""
    matcher = difflib.SequenceMatcher(None, original.splitlines(), modified.splitlines())
    for tag, i1, i2, j1, j2 in matcher.get_opcodes():
        orig_block = original.splitlines()[i1:i2]
        mod_block  = modified.splitlines()[j1:j2]
        max_len = max(len(orig_block), len(mod_block))
        for k in range(max_len):
            a = orig_block[k] if k < len(orig_block) else ""
            b = mod_block[k]  if k < len(mod_block)  else ""
            yield tag, a, b

# Example
text_a = """apple
banana
cherry"""

text_b = """apple
blueberry
cherry
date"""

# Unified diff
for line in line_diff(text_a, text_b):
    print(line)

# Side-by-side
print("\n--- Side by side ---")
for tag, a, b in side_by_side_diff(text_a, text_b):
    marker = " " if tag == "equal" else ("+" if tag == "insert" else ("-" if tag == "delete" else "~"))
    print(f"{marker} {a!r:20} | {b!r}")