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assignment_split_value_first.py
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assignment_split_value_first.py
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#######
# Unsplittable target and value
# Only parenthesize the value if it makes it fit, otherwise avoid parentheses.
b = aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaabbbbbbbbbbbbbbbbbbbbbbbbbbbvvvvvvvvvvvvvvvvvee
bbbbbbbbbbbbbbbb = aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaabbbbbbbbbbbbbbbbbbbbbbbbbbbvv
# Avoid parenthesizing the value even if the target exceeds the configured width
bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb = bbb
############
# Splittable targets
# Does not double-parenthesize tuples
(
first_item,
second_item,
) = some_looooooooong_module.some_loooooog_function_name(
first_argument, second_argument, third_argument
)
# Preserve parentheses around the first target
(
req["ticket"]["steps"]["step"][0]["tasks"]["task"]["fields"]["field"][
"access_request"
]["destinations"]["destination"][0]["ip_address"]
) = dst
# Augmented assignment
req["ticket"]["steps"]["step"][0]["tasks"]["task"]["fields"]["field"][
"access_request"
] += dst
# Always parenthesize the value if it avoids splitting the target, regardless of the value's width.
_a: a[aaaa] = (
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaabbbbbbbbbbbbbbbbbbbbbbbbbbbvvvvvvvvvvvvvvvvv
)
#####
# Avoid parenthesizing the value if the expression right before the `=` splits to avoid an unnecessary pair of parentheses
# The type annotation is guaranteed to split because it is too long.
_a: a[
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaabbbbbbbbbbbbbbbbbbbbbbbbbbbvvvvvvvvvvvvvvvvv
] = aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaabbbbbbbbbbbbbbbbbbbbbbbbbbbvvvvvvvvvvvvvvvvv
# The target is too long
(
aaaaaaaaaaa,
bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb,
) = aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaabbbbbbbbbbbbbbbbbbbbbbbbbbbvvvvvvvvvvvvvvvvv
# The target splits because of a magic trailing comma
(
a,
b,
) = aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaabbbbbbbbbbbbbbbbbbbbbbbbbbbvvvvvvvvvvvvvvvvvvvv
# The targets split because of a comment
(
# leading
a
) = aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaabbbbbbbbbbbbbbbbbbbbbbbbbbbvvvvvvvvvvvvvvvvvvvv
(
a
# trailing
) = aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaabbbbbbbbbbbbbbbbbbbbbbbbbbbvvvvvvvvvvvvvvvvvvvv
(
a, # nested
b
) = aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaabbbbbbbbbbbbbbbbbbbbbbbbbbbvvvvvvvvvvvvvvvvvvvv
#######
# Multi targets
# Black always parenthesizes the right if using multiple targets regardless if the parenthesized value exceeds the
# the configured line width or not
aaaa = bbbbbbbbbbbbbbbb = (
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaabbbbbbbbbbbbbbbbbbbbbbbbbbbvvvvvvvvvvvvvvvvvee
)
# Black does parenthesize the target if the target itself exceeds the line width and only parenthesizes
# the values if it makes it fit.
# The second target is too long to ever fit into the configured line width.
aaaa = (
bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbdddd
) = aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaabbbbbbbbbbbbbbbbbbbbbbbbbbbvvvvvvvvvvvvvvvvvee
# Does also apply for other multi target assignments, as soon as a single target exceeds the configured
# width
aaaaaa = a["aaa"] = bbbbb[aa, bbb, cccc] = dddddddddd = eeeeee = (
fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff
) = aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
######################
# Call expressions:
# For unsplittable targets: Parenthesize the call expression if it makes it fit.
#
# For splittable targets:
# Only parenthesize a call expression if the parens of the call don't fit on the same line
# as the target. Don't parenthesize the call expression if the target (or annotation) right before
# splits.
# Don't parenthesize the function call if the left is unsplittable.
this_is_a_ridiculously_long_name_and_nobody_in_their_right_mind_would_use_one_like_it = a.b.function(
arg1, arg2, arg3
)
this_is_a_ridiculously_long_name_and_nobody_in_their_right_mind_would_use_one_like_it = function(
[1, 2, 3], arg1, [1, 2, 3], arg2, [1, 2, 3], arg3
)
this_is_a_ridiculously_long_name_and_nobody_in_their_right_mind_would_use_one_like_it = function(
[1, 2, 3],
arg1,
[1, 2, 3],
arg2,
[1, 2, 3],
arg3,
dddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd,
eeeeeeeeeeeeee,
)
this_is_a_ridiculously_long_name_and_nobody_in_their_right_mind_would_use_one_like_it = (
function()
)
this_is_a_ridiculously_long_name_and_nobodyddddddddddddddddddddddddddddddd = (
a.b.function(arg1, arg2, arg3)
)
this_is_a_ridiculously_long_name_and_nobodyddddddddddddddddddddddddddddddd = function()
this_is_a_ridiculously_long_name_and_nobodyddddddddddddddddddddddddddddddd = function(
[1, 2, 3], arg1, [1, 2, 3], arg2, [1, 2, 3], arg3
)
this_is_a_ridiculously_long_name_and_nobodyddddddddddddddddddddddddddddddd = function(
[1, 2, 3],
arg1,
[1, 2, 3],
arg2,
[1, 2, 3],
arg3,
dddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd,
eeeeeeeeeeeeee,
)
####### Fluent call expressions
# Uses the regular `Multiline` layout where the entire `value` gets parenthesized
# if it doesn't fit on the line.
this_is_a_ridiculously_long_name_and_nobody_in_their_right_mind_would_use = (
function().b().c([1, 2, 3], arg1, [1, 2, 3], arg2, [1, 2, 3], arg3)
)
#######
# Test comment inlining
value.__dict__[key] = (
"test" # set some Thrift field to non-None in the struct aa bb cc dd ee
)
value.__dict__.keye = (
"test" # set some Thrift field to non-None in the struct aa bb cc dd ee
)
value.__dict__.keye = (
"test" # set some Thrift field to non-None in the struct aa bb cc dd ee
)
# Don't parenthesize the value because the target's trailing comma forces it to split.
a[
aaaaaaa,
b,
] = cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc # comment
# Parenthesize the value, but don't duplicate the comment.
a[aaaaaaa, b] = (
cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc # comment
)
# Format both as flat, but don't loos the comment.
a[aaaaaaa, b] = bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb # comment
#######################################################
# Test the case where a parenthesized value now fits:
a[
aaaaaaa,
b
] = (
cccccccc # comment
)
# Splits the target but not the value because of the magic trailing comma.
a[
aaaaaaa,
b,
] = (
cccccccc # comment
)
# Splits the second target because of the comment and the first target because of the trailing comma.
a[
aaaaaaa,
b,
] = (
# leading comment
b
) = (
cccccccc # comment
)
########
# Type Alias Statement
type A[str, int, number] = VeryLongTypeNameThatShouldBreakFirstToTheRightBeforeSplitngtin
type A[VeryLongTypeNameThatShouldBreakFirstToTheRightBeforeSplitngtinthatExceedsTheWidth] = str