STYLE: Use property decorator syntax in Cython (#18602)

Author: jschendel

pandas/_libs/index.pyx

@@ -220,34 +220,31 @@ cdef class IndexEngine:
  def __sizeof__(self):
  return self.sizeof()
 
- property is_unique:
+ @property
+ def is_unique(self):
+ if self.need_unique_check:
+ self._do_unique_check()
 
- def __get__(self):
- if self.need_unique_check:
- self._do_unique_check()
-
- return self.unique == 1
+ return self.unique == 1
 
  cdef inline _do_unique_check(self):
 
  # this de-facto the same
  self._ensure_mapping_populated()
 
- property is_monotonic_increasing:
-
- def __get__(self):
- if self.need_monotonic_check:
- self._do_monotonic_check()
+ @property
+ def is_monotonic_increasing(self):
+ if self.need_monotonic_check:
+ self._do_monotonic_check()
 
-  return self.monotonic_inc == 1
+ return self.monotonic_inc == 1
 
- property is_monotonic_decreasing:
+ @property
+ def is_monotonic_decreasing(self):
+ if self.need_monotonic_check:
+ self._do_monotonic_check()
 
- def __get__(self):
- if self.need_monotonic_check:
- self._do_monotonic_check()
-
- return self.monotonic_dec == 1
+ return self.monotonic_dec == 1
 
  cdef inline _do_monotonic_check(self):
  cdef object is_unique
@@ -279,10 +276,9 @@ cdef class IndexEngine:
  cdef _check_type(self, object val):
  hash(val)
 
- property is_mapping_populated:
-
- def __get__(self):
- return self.mapping is not None
+ @property
+ def is_mapping_populated(self):
+ return self.mapping is not None
 
  cdef inline _ensure_mapping_populated(self):
  # this populates the mapping

pandas/_libs/tslibs/conversion.pyx

@@ -203,9 +203,9 @@ cdef class _TSObject:
  # int64_t value # numpy dt64
  # object tzinfo
 
- property value:
-  def __get__(self):
-  return self.value
+ @property
+ def value(self):
+ return self.value
 
 
 cpdef int64_t pydt_to_i8(object pydt) except? -1: