| .. _str-ops: | |
| Native string operations | |
| ======================== | |
| These ``str`` operations have fast, optimized implementations. Other | |
| string operations use generic implementations that are often slower. | |
| Construction | |
| ------------ | |
| * String literal | |
| * ``str(x: int)`` | |
| * ``str(x: object)`` | |
| Operators | |
| --------- | |
| * Concatenation (``s1 + s2``) | |
| * Indexing (``s[n]``) | |
| * Slicing (``s[n:m]``, ``s[n:]``, ``s[:m]``) | |
| * Comparisons (``==``, ``!=``) | |
| * Augmented assignment (``s1 += s2``) | |
| .. _str-methods: | |
| Methods | |
| ------- | |
| * ``s.encode()`` | |
| * ``s.encode(encoding: str)`` | |
| * ``s.encode(encoding: str, errors: str)`` | |
| * ``s1.endswith(s2: str)`` | |
| * ``s.join(x: Iterable)`` | |
| * ``s.replace(old: str, new: str)`` | |
| * ``s.replace(old: str, new: str, count: int)`` | |
| * ``s.split()`` | |
| * ``s.split(sep: str)`` | |
| * ``s.split(sep: str, maxsplit: int)`` | |
| * ``s1.startswith(s2: str)`` | |
| .. note:: | |
| :ref:`bytes.decode() <bytes-methods>` is also optimized. | |
| Formatting | |
| ---------- | |
| A subset of these common string formatting expressions are optimized: | |
| * F-strings | |
| * ``"...".format(...)`` | |
| * ``"..." % (...)`` | |
| Functions | |
| --------- | |
| * ``len(s: str)`` | |
| * ``ord(s: str)`` | |