Completed the second iteration of the documentation.

src/sage/data_structures/coefficient_stream.py

@@ -435,10 +435,10 @@ def __hash__(self):
 
  EXAMPLES::
 
- sage: L.<z> = LazyLaurentSeriesRing(QQ)
- sage: f = 1 + z + z^2 + z^3
- sage: {f: 1}
- {1 + z + z^2 + z^3: 1}
+ sage: from sage.data_structures.coefficient_stream import CoefficientStream_exact
+ sage: s = CoefficientStream_exact([1], False)
+ sage: hash(s) == hash(s)
+ True
  """
  return hash((self._initial_coefficients, self._degree, self._constant))
 
@@ -754,10 +754,11 @@ def __hash__(self):
 
  EXAMPLES::
 
- sage: L.<z> = LazyLaurentSeriesRing(ZZ)
- sage: f = ~(1 - z)
- sage: {f: 1}
- {1 + z + z^2 + z^3 + z^4 + z^5 + z^6 + ...: 1}
+ sage: from sage.data_structures.coefficient_stream import CoefficientStream_unary
+ sage: from sage.data_structures.coefficient_stream import CoefficientStream_coefficient_function
+ sage: M = CoefficientStream_unary(CoefficientStream_coefficient_function(lambda n: 1, ZZ, False, 1), True, 0)
+ sage: hash(M) == hash(M)
+ True
  """
  return hash((type(self), self._series))
 
@@ -834,10 +835,13 @@ def __hash__(self):
 
  EXAMPLES::
 
- sage: L.<z> = LazyLaurentSeriesRing(ZZ)
- sage: f = 1/(1 - z) + 1/(1 + z)
- sage: {f: 1}
- {2 + 2*z^2 + 2*z^4 + 2*z^6 + ...: 1}
+ sage: from sage.data_structures.coefficient_stream import CoefficientStream_binary
+ sage: from sage.data_structures.coefficient_stream import CoefficientStream_coefficient_function
+ sage: M = CoefficientStream_coefficient_function(lambda n: n, ZZ, True, 0)
+ sage: N = CoefficientStream_coefficient_function(lambda n: -2*n, ZZ, True, 0)
+ sage: O = CoefficientStream_binary(M, N, True, 0)
+ sage: hash(O) == hash(O)
+ True
  """
  return hash((type(self), self._left, self._right))
 
@@ -875,10 +879,6 @@ class CoefficientStream_binary_commutative(CoefficientStream_binary):
  Abstract base class for commutative binary operators for the
  coefficient stream.
 
- INPUT:
-
- - ``other`` -- a :class:`CoefficientStream`
-
  EXAMPLES::
 
  sage: from sage.data_structures.coefficient_stream import (CoefficientStream_coefficient_function, CoefficientStream_add)
@@ -899,10 +899,13 @@ def __hash__(self):
 
  EXAMPLES::
 
- sage: L.<z> = LazyLaurentSeriesRing(ZZ)
- sage: f = z^2 + z
- sage: {f: 1}
- {z + z^2: 1}
+ sage: from sage.data_structures.coefficient_stream import (CoefficientStream_coefficient_function, CoefficientStream_add)
+ sage: f = CoefficientStream_coefficient_function(lambda n: 2*n, ZZ, True, 0)
+ sage: g = CoefficientStream_coefficient_function(lambda n: n, ZZ, True, 1)
+ sage: h = CoefficientStream_add(f, g)
+ sage: u = CoefficientStream_add(g, f)
+ sage: hash(h) == hash(u)
+ True
  """
  return hash((type(self), frozenset([self._left, self._right])))
 
@@ -1007,10 +1010,10 @@ def __hash__(self):
 
  sage: from sage.data_structures.coefficient_stream import CoefficientStream_zero
  sage: s = CoefficientStream_zero(False)
- sage: a = s.__hash__(); a
+ sage: a = hash(s); a
  0
  sage: t = CoefficientStream_zero(False)
- sage: b = t.__hash__(); b
+ sage: b = hash(t); b
  0
  sage: b == a
  True