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

```py
slice[a.b : c.d]
slice[d :: d + 1]
slice[d + 1 :: d]
slice[d::d]
slice[0]
slice[-1]
slice[:-1]
slice[::-1]
slice[:c, c - 1]
slice[c, c + 1, d::]
slice[ham[c::d] :: 1]
slice[ham[cheese**2 : -1] : 1 : 1, ham[1:2]]
slice[:-1:]
slice[lambda: None : lambda: None]
slice[lambda x, y, *args, really=2, **kwargs: None :, None::]
slice[1 or 2 : True and False]
slice[not so_simple : 1 < val <= 10]
slice[(1 for i in range(42)) : x]
slice[:: [i for i in range(42)]]


async def f():
    slice[await x : [i async for i in arange(42)] : 42]


# These are from PEP-8:
ham[1:9], ham[1:9:3], ham[:9:3], ham[1::3], ham[1:9:]
ham[lower:upper], ham[lower:upper:], ham[lower::step]
# ham[lower+offset : upper+offset]
ham[: upper_fn(x) : step_fn(x)], ham[:: step_fn(x)]
ham[lower + offset : upper + offset]

slice[::, ::]
slice[
    # A
    :
    # B
    :
    # C
]
slice[
    # A
    1:
    # B
    2:
    # C
    3
]

slice[
    # A
    1
    + 2 :
    # B
    3 :
    # C
    4
]
x[
    1:  # A
    2:  # B
    3  # C
]
```

## Black Differences

```diff
--- Black
+++ Ruff
@@ -4,30 +4,30 @@
 slice[d::d]
 slice[0]
 slice[-1]
-slice[:-1]
-slice[::-1]
+slice[ : -1]
+slice[ :: -1]
 slice[:c, c - 1]
 slice[c, c + 1, d::]
 slice[ham[c::d] :: 1]
 slice[ham[cheese**2 : -1] : 1 : 1, ham[1:2]]
-slice[:-1:]
-slice[lambda: None : lambda: None]
-slice[lambda x, y, *args, really=2, **kwargs: None :, None::]
+slice[ : -1 :]
+slice[lambda x: True : lambda x: True]
+slice[lambda x: True :, None::]
 slice[1 or 2 : True and False]
 slice[not so_simple : 1 < val <= 10]
-slice[(1 for i in range(42)) : x]
-slice[:: [i for i in range(42)]]
+slice[(i for i in []) : x]
+slice[ :: [i for i in []]]
 
 
 async def f():
-    slice[await x : [i async for i in arange(42)] : 42]
+    slice[await x : [i for i in []] : 42]
 
 
 # These are from PEP-8:
 ham[1:9], ham[1:9:3], ham[:9:3], ham[1::3], ham[1:9:]
 ham[lower:upper], ham[lower:upper:], ham[lower::step]
 # ham[lower+offset : upper+offset]
-ham[: upper_fn(x) : step_fn(x)], ham[:: step_fn(x)]
+ham[ : upper_fn(x) : step_fn(x)], ham[ :: step_fn(x)]
 ham[lower + offset : upper + offset]
 
 slice[::, ::]
@@ -50,10 +50,14 @@
 slice[
     # A
     1
-    + 2 :
+    + 2 : 
     # B
-    3 :
+    3 : 
     # C
     4
 ]
-x[1:2:3]  # A  # B  # C
+x[
+    1:  # A
+    2:  # B
+    3  # C
+]
```

## Ruff Output

```py
slice[a.b : c.d]
slice[d :: d + 1]
slice[d + 1 :: d]
slice[d::d]
slice[0]
slice[-1]
slice[ : -1]
slice[ :: -1]
slice[:c, c - 1]
slice[c, c + 1, d::]
slice[ham[c::d] :: 1]
slice[ham[cheese**2 : -1] : 1 : 1, ham[1:2]]
slice[ : -1 :]
slice[lambda x: True : lambda x: True]
slice[lambda x: True :, None::]
slice[1 or 2 : True and False]
slice[not so_simple : 1 < val <= 10]
slice[(i for i in []) : x]
slice[ :: [i for i in []]]


async def f():
    slice[await x : [i for i in []] : 42]


# These are from PEP-8:
ham[1:9], ham[1:9:3], ham[:9:3], ham[1::3], ham[1:9:]
ham[lower:upper], ham[lower:upper:], ham[lower::step]
# ham[lower+offset : upper+offset]
ham[ : upper_fn(x) : step_fn(x)], ham[ :: step_fn(x)]
ham[lower + offset : upper + offset]

slice[::, ::]
slice[
    # A
    :
    # B
    :
    # C
]
slice[
    # A
    1:
    # B
    2:
    # C
    3
]

slice[
    # A
    1
    + 2 : 
    # B
    3 : 
    # C
    4
]
x[
    1:  # A
    2:  # B
    3  # C
]
```

## Black Output

```py
slice[a.b : c.d]
slice[d :: d + 1]
slice[d + 1 :: d]
slice[d::d]
slice[0]
slice[-1]
slice[:-1]
slice[::-1]
slice[:c, c - 1]
slice[c, c + 1, d::]
slice[ham[c::d] :: 1]
slice[ham[cheese**2 : -1] : 1 : 1, ham[1:2]]
slice[:-1:]
slice[lambda: None : lambda: None]
slice[lambda x, y, *args, really=2, **kwargs: None :, None::]
slice[1 or 2 : True and False]
slice[not so_simple : 1 < val <= 10]
slice[(1 for i in range(42)) : x]
slice[:: [i for i in range(42)]]


async def f():
    slice[await x : [i async for i in arange(42)] : 42]


# These are from PEP-8:
ham[1:9], ham[1:9:3], ham[:9:3], ham[1::3], ham[1:9:]
ham[lower:upper], ham[lower:upper:], ham[lower::step]
# ham[lower+offset : upper+offset]
ham[: upper_fn(x) : step_fn(x)], ham[:: step_fn(x)]
ham[lower + offset : upper + offset]

slice[::, ::]
slice[
    # A
    :
    # B
    :
    # C
]
slice[
    # A
    1:
    # B
    2:
    # C
    3
]

slice[
    # A
    1
    + 2 :
    # B
    3 :
    # C
    4
]
x[1:2:3]  # A  # B  # C
```