---
source: crates/ruff_python_formatter/tests/fixtures.rs
input_file: crates/ruff_python_formatter/resources/test/fixtures/black/simple_cases/function.py
---
## Input

```py
#!/usr/bin/env python3
import asyncio
import sys

from third_party import X, Y, Z

from library import some_connection, \
                    some_decorator
f'trigger 3.6 mode'
def func_no_args():
  a; b; c
  if True: raise RuntimeError
  if False: ...
  for i in range(10):
    print(i)
    continue
  exec("new-style exec", {}, {})
  return None
async def coroutine(arg, exec=False):
 "Single-line docstring. Multiline is harder to reformat."
 async with some_connection() as conn:
     await conn.do_what_i_mean('SELECT bobby, tables FROM xkcd', timeout=2)
 await asyncio.sleep(1)
@asyncio.coroutine
@some_decorator(
with_args=True,
many_args=[1,2,3]
)
def function_signature_stress_test(number:int,no_annotation=None,text:str="default",* ,debug:bool=False,**kwargs) -> str:
 return text[number:-1]
def spaces(a=1, b=(), c=[], d={}, e=True, f=-1, g=1 if False else 2, h="", i=r''):
 offset = attr.ib(default=attr.Factory( lambda: _r.uniform(10000, 200000)))
 assert task._cancel_stack[:len(old_stack)] == old_stack
def spaces_types(a: int = 1, b: tuple = (), c: list = [], d: dict = {}, e: bool = True, f: int = -1, g: int = 1 if False else 2, h: str = "", i: str = r''): ...
def spaces2(result= _core.Value(None)):
 assert fut is self._read_fut, (fut, self._read_fut)
    
def example(session):
    result = session.query(models.Customer.id).filter(
        models.Customer.account_id == account_id,
        models.Customer.email == email_address,
    ).order_by(
        models.Customer.id.asc()
    ).all()
def long_lines():
    if True:
        typedargslist.extend(
            gen_annotated_params(ast_args.kwonlyargs, ast_args.kw_defaults, parameters, implicit_default=True)
        )
        typedargslist.extend(
            gen_annotated_params(
                ast_args.kwonlyargs, ast_args.kw_defaults, parameters, implicit_default=True,
                # trailing standalone comment
            )
        )
    _type_comment_re = re.compile(
        r"""
        ^
        [\t ]*
        \#[ ]type:[ ]*
        (?P<type>
            [^#\t\n]+?
        )
        (?<!ignore)     # note: this will force the non-greedy + in <type> to match
                        # a trailing space which is why we need the silliness below
        (?<!ignore[ ]{1})(?<!ignore[ ]{2})(?<!ignore[ ]{3})(?<!ignore[ ]{4})
        (?<!ignore[ ]{5})(?<!ignore[ ]{6})(?<!ignore[ ]{7})(?<!ignore[ ]{8})
        (?<!ignore[ ]{9})(?<!ignore[ ]{10})
        [\t ]*
        (?P<nl>
            (?:\#[^\n]*)?
            \n?
        )
        $
        """, re.MULTILINE | re.VERBOSE
    )
def trailing_comma():
    mapping = {
    A: 0.25 * (10.0 / 12),
    B: 0.1 * (10.0 / 12),
    C: 0.1 * (10.0 / 12),
    D: 0.1 * (10.0 / 12),
}
def f(
  a,
  **kwargs,
) -> A:
    return (
        yield from A(
            very_long_argument_name1=very_long_value_for_the_argument,
            very_long_argument_name2=very_long_value_for_the_argument,
            **kwargs,
        )
    )
def __await__(): return (yield)
```

## Black Differences

```diff
--- Black
+++ Ruff
@@ -1,12 +1,11 @@
 #!/usr/bin/env python3
-import asyncio
-import sys
-
-from third_party import X, Y, Z
+NOT_YET_IMPLEMENTED_StmtImport
+NOT_YET_IMPLEMENTED_StmtImport
 
-from library import some_connection, some_decorator
+NOT_YET_IMPLEMENTED_StmtImportFrom
 
-f"trigger 3.6 mode"
+NOT_YET_IMPLEMENTED_StmtImportFrom
+NOT_YET_IMPLEMENTED_ExprJoinedStr
 
 
 def func_no_args():
@@ -14,7 +13,7 @@
     b
     c
     if True:
-        raise RuntimeError
+        NOT_YET_IMPLEMENTED_StmtRaise
     if False:
         ...
     for i in range(10):
@@ -41,12 +40,22 @@
     debug: bool = False,
     **kwargs,
 ) -> str:
-    return text[number:-1]
+    return text[number : -1]
 
 
-def spaces(a=1, b=(), c=[], d={}, e=True, f=-1, g=1 if False else 2, h="", i=r""):
-    offset = attr.ib(default=attr.Factory(lambda: _r.uniform(10000, 200000)))
-    assert task._cancel_stack[: len(old_stack)] == old_stack
+def spaces(
+    a=1,
+    b=(),
+    c=[],
+    d={},
+    e=True,
+    f=-1,
+    g=NOT_IMPLEMENTED_true if NOT_IMPLEMENTED_cond else NOT_IMPLEMENTED_false,
+    h="",
+    i=r"",
+):
+    offset = attr.ib(default=attr.Factory(lambda x: True))
+    NOT_YET_IMPLEMENTED_StmtAssert
 
 
 def spaces_types(
@@ -56,7 +65,7 @@
     d: dict = {},
     e: bool = True,
     f: int = -1,
-    g: int = 1 if False else 2,
+    g: int = NOT_IMPLEMENTED_true if NOT_IMPLEMENTED_cond else NOT_IMPLEMENTED_false,
     h: str = "",
     i: str = r"",
 ):
@@ -64,19 +73,16 @@
 
 
 def spaces2(result=_core.Value(None)):
-    assert fut is self._read_fut, (fut, self._read_fut)
+    NOT_YET_IMPLEMENTED_StmtAssert
 
 
 def example(session):
-    result = (
-        session.query(models.Customer.id)
-        .filter(
-            models.Customer.account_id == account_id,
-            models.Customer.email == email_address,
-        )
-        .order_by(models.Customer.id.asc())
-        .all()
-    )
+    result = session.query(models.Customer.id).filter(
+        models.Customer.account_id
+        == account_id,
+        models.Customer.email
+        == email_address,
+    ).order_by(models.Customer.id.asc()).all()
 
 
 def long_lines():
@@ -87,7 +93,7 @@
                 ast_args.kw_defaults,
                 parameters,
                 implicit_default=True,
-            )
+            ),
         )
         typedargslist.extend(
             gen_annotated_params(
@@ -96,7 +102,7 @@
                 parameters,
                 implicit_default=True,
                 # trailing standalone comment
-            )
+            ),
         )
     _type_comment_re = re.compile(
         r"""
@@ -118,7 +124,8 @@
         )
         $
         """,
-        re.MULTILINE | re.VERBOSE,
+        re.MULTILINE
+        | re.VERBOSE,
     )
 
 
@@ -135,14 +142,8 @@
     a,
     **kwargs,
 ) -> A:
-    return (
-        yield from A(
-            very_long_argument_name1=very_long_value_for_the_argument,
-            very_long_argument_name2=very_long_value_for_the_argument,
-            **kwargs,
-        )
-    )
+    return NOT_YET_IMPLEMENTED_ExprYieldFrom
 
 
 def __await__():
-    return (yield)
+    return NOT_YET_IMPLEMENTED_ExprYield
```

## Ruff Output

```py
#!/usr/bin/env python3
NOT_YET_IMPLEMENTED_StmtImport
NOT_YET_IMPLEMENTED_StmtImport

NOT_YET_IMPLEMENTED_StmtImportFrom

NOT_YET_IMPLEMENTED_StmtImportFrom
NOT_YET_IMPLEMENTED_ExprJoinedStr


def func_no_args():
    a
    b
    c
    if True:
        NOT_YET_IMPLEMENTED_StmtRaise
    if False:
        ...
    for i in range(10):
        print(i)
        continue
    exec("new-style exec", {}, {})
    return None


async def coroutine(arg, exec=False):
    "Single-line docstring. Multiline is harder to reformat."
    async with some_connection() as conn:
        await conn.do_what_i_mean("SELECT bobby, tables FROM xkcd", timeout=2)
    await asyncio.sleep(1)


@asyncio.coroutine
@some_decorator(with_args=True, many_args=[1, 2, 3])
def function_signature_stress_test(
    number: int,
    no_annotation=None,
    text: str = "default",
    *,
    debug: bool = False,
    **kwargs,
) -> str:
    return text[number : -1]


def spaces(
    a=1,
    b=(),
    c=[],
    d={},
    e=True,
    f=-1,
    g=NOT_IMPLEMENTED_true if NOT_IMPLEMENTED_cond else NOT_IMPLEMENTED_false,
    h="",
    i=r"",
):
    offset = attr.ib(default=attr.Factory(lambda x: True))
    NOT_YET_IMPLEMENTED_StmtAssert


def spaces_types(
    a: int = 1,
    b: tuple = (),
    c: list = [],
    d: dict = {},
    e: bool = True,
    f: int = -1,
    g: int = NOT_IMPLEMENTED_true if NOT_IMPLEMENTED_cond else NOT_IMPLEMENTED_false,
    h: str = "",
    i: str = r"",
):
    ...


def spaces2(result=_core.Value(None)):
    NOT_YET_IMPLEMENTED_StmtAssert


def example(session):
    result = session.query(models.Customer.id).filter(
        models.Customer.account_id
        == account_id,
        models.Customer.email
        == email_address,
    ).order_by(models.Customer.id.asc()).all()


def long_lines():
    if True:
        typedargslist.extend(
            gen_annotated_params(
                ast_args.kwonlyargs,
                ast_args.kw_defaults,
                parameters,
                implicit_default=True,
            ),
        )
        typedargslist.extend(
            gen_annotated_params(
                ast_args.kwonlyargs,
                ast_args.kw_defaults,
                parameters,
                implicit_default=True,
                # trailing standalone comment
            ),
        )
    _type_comment_re = re.compile(
        r"""
        ^
        [\t ]*
        \#[ ]type:[ ]*
        (?P<type>
            [^#\t\n]+?
        )
        (?<!ignore)     # note: this will force the non-greedy + in <type> to match
                        # a trailing space which is why we need the silliness below
        (?<!ignore[ ]{1})(?<!ignore[ ]{2})(?<!ignore[ ]{3})(?<!ignore[ ]{4})
        (?<!ignore[ ]{5})(?<!ignore[ ]{6})(?<!ignore[ ]{7})(?<!ignore[ ]{8})
        (?<!ignore[ ]{9})(?<!ignore[ ]{10})
        [\t ]*
        (?P<nl>
            (?:\#[^\n]*)?
            \n?
        )
        $
        """,
        re.MULTILINE
        | re.VERBOSE,
    )


def trailing_comma():
    mapping = {
        A: 0.25 * (10.0 / 12),
        B: 0.1 * (10.0 / 12),
        C: 0.1 * (10.0 / 12),
        D: 0.1 * (10.0 / 12),
    }


def f(
    a,
    **kwargs,
) -> A:
    return NOT_YET_IMPLEMENTED_ExprYieldFrom


def __await__():
    return NOT_YET_IMPLEMENTED_ExprYield
```

## Black Output

```py
#!/usr/bin/env python3
import asyncio
import sys

from third_party import X, Y, Z

from library import some_connection, some_decorator

f"trigger 3.6 mode"


def func_no_args():
    a
    b
    c
    if True:
        raise RuntimeError
    if False:
        ...
    for i in range(10):
        print(i)
        continue
    exec("new-style exec", {}, {})
    return None


async def coroutine(arg, exec=False):
    "Single-line docstring. Multiline is harder to reformat."
    async with some_connection() as conn:
        await conn.do_what_i_mean("SELECT bobby, tables FROM xkcd", timeout=2)
    await asyncio.sleep(1)


@asyncio.coroutine
@some_decorator(with_args=True, many_args=[1, 2, 3])
def function_signature_stress_test(
    number: int,
    no_annotation=None,
    text: str = "default",
    *,
    debug: bool = False,
    **kwargs,
) -> str:
    return text[number:-1]


def spaces(a=1, b=(), c=[], d={}, e=True, f=-1, g=1 if False else 2, h="", i=r""):
    offset = attr.ib(default=attr.Factory(lambda: _r.uniform(10000, 200000)))
    assert task._cancel_stack[: len(old_stack)] == old_stack


def spaces_types(
    a: int = 1,
    b: tuple = (),
    c: list = [],
    d: dict = {},
    e: bool = True,
    f: int = -1,
    g: int = 1 if False else 2,
    h: str = "",
    i: str = r"",
):
    ...


def spaces2(result=_core.Value(None)):
    assert fut is self._read_fut, (fut, self._read_fut)


def example(session):
    result = (
        session.query(models.Customer.id)
        .filter(
            models.Customer.account_id == account_id,
            models.Customer.email == email_address,
        )
        .order_by(models.Customer.id.asc())
        .all()
    )


def long_lines():
    if True:
        typedargslist.extend(
            gen_annotated_params(
                ast_args.kwonlyargs,
                ast_args.kw_defaults,
                parameters,
                implicit_default=True,
            )
        )
        typedargslist.extend(
            gen_annotated_params(
                ast_args.kwonlyargs,
                ast_args.kw_defaults,
                parameters,
                implicit_default=True,
                # trailing standalone comment
            )
        )
    _type_comment_re = re.compile(
        r"""
        ^
        [\t ]*
        \#[ ]type:[ ]*
        (?P<type>
            [^#\t\n]+?
        )
        (?<!ignore)     # note: this will force the non-greedy + in <type> to match
                        # a trailing space which is why we need the silliness below
        (?<!ignore[ ]{1})(?<!ignore[ ]{2})(?<!ignore[ ]{3})(?<!ignore[ ]{4})
        (?<!ignore[ ]{5})(?<!ignore[ ]{6})(?<!ignore[ ]{7})(?<!ignore[ ]{8})
        (?<!ignore[ ]{9})(?<!ignore[ ]{10})
        [\t ]*
        (?P<nl>
            (?:\#[^\n]*)?
            \n?
        )
        $
        """,
        re.MULTILINE | re.VERBOSE,
    )


def trailing_comma():
    mapping = {
        A: 0.25 * (10.0 / 12),
        B: 0.1 * (10.0 / 12),
        C: 0.1 * (10.0 / 12),
        D: 0.1 * (10.0 / 12),
    }


def f(
    a,
    **kwargs,
) -> A:
    return (
        yield from A(
            very_long_argument_name1=very_long_value_for_the_argument,
            very_long_argument_name2=very_long_value_for_the_argument,
            **kwargs,
        )
    )


def __await__():
    return (yield)
```