Various improvements for physics/secondquant.py

In this patch-series I improve some annoyances in the second-quantization module. - Make substitute_dummies() more flexible and controllable w.r.t. output - substitute_dummies should also accept single term expressions. - Fixed doctests and improved documentation of _substitute() in secondquant.

[PATCH 1/6] Improved documentation for evaluate_deltas

--- sympy/physics/secondquant.py | 25 + 1 files changed, 13 insertions(+), 12 deletions(-) diff --git a/sympy/physics/secondquant.py b/sympy/physics/secondquant.py index edc9987..687bf9d 100644 --- a/sympy/physics/secondquant.py +++ b/sympy/physics/secondquant.py @@ -23

[PATCH 2/6] Improved documentation of _sort_anticommuting_fermions() in secondquant.py

--- sympy/physics/secondquant.py |4 ++-- 1 files changed, 2 insertions(+), 2 deletions(-) diff --git a/sympy/physics/secondquant.py b/sympy/physics/secondquant.py index 687bf9d..b7ae493 100644 --- a/sympy/physics/secondquant.py +++ b/sympy/physics/secondquant.py @@ -2269,8 +2269,8 @@ def _so

[PATCH 6/6] Make substitute_dummies() more flexible and controllable w.r.t. output

The keyword pretty_indices used to be boolean, but is now a dict of lists containing letters to label the new dummy indices. This allows the user much better control over the resulting expression. Docstring and doctests updated accordingly. --- sympy/physics/secondquant.py | 104 +++

[PATCH 3/6] Refactoring in substitute_dummies and related helper routines

renamed the iterator '_reverse' to 'arg_iterator' for clarity --- sympy/physics/secondquant.py | 23 ++- 1 files changed, 10 insertions(+), 13 deletions(-) diff --git a/sympy/physics/secondquant.py b/sympy/physics/secondquant.py index b7ae493..93f9ca3 100644 --- a/sympy/phys

[PATCH 4/6] Fixed doctests and improved documentation of _substitute() in secondquant.py

--- sympy/physics/secondquant.py | 29 - 1 files changed, 20 insertions(+), 9 deletions(-) diff --git a/sympy/physics/secondquant.py b/sympy/physics/secondquant.py index 93f9ca3..858c222 100644 --- a/sympy/physics/secondquant.py +++ b/sympy/physics/secondquant.py @@

[PATCH 5/6] substitute_dummies should also accept single term expressions.

--- sympy/physics/secondquant.py |6 -- 1 files changed, 4 insertions(+), 2 deletions(-) diff --git a/sympy/physics/secondquant.py b/sympy/physics/secondquant.py index 858c222..6a5fa60 100644 --- a/sympy/physics/secondquant.py +++ b/sympy/physics/secondquant.py @@ -2666,8 +2666,10 @@ def

[PATCH 6/6] Make substitute_dummies() more flexible and controllable w.r.t. output

The keyword pretty_indices used to be boolean, but is now a dict of lists containing letters to label the new dummy indices. This allows the user much better control over the resulting expression. Docstring and doctests updated accordingly. --- sympy/physics/secondquant.py | 104 +++