Merge pull request #24474 from Kishore96in/fix_imag_tens_print_onmaster

tensor: fix printing of TensMul with imaginary coefficients

.mailmap

@@ -787,6 +787,7 @@ Kirill Smelkov <kirr@landau.phys.spbu.ru> convert-repo <devnull@localhost>
 Kirill Smelkov <kirr@landau.phys.spbu.ru> kirill.smelkov <devnull@localhost>
 Kirtan Mali <kirtanmali555@gmail.com> KIRTAN  MALI <43683545+kmm555@users.noreply.github.com>
 Kirtan Mali <kirtanmali555@gmail.com> kmm555 <kirtanmali555@gmail.com>
+Kishore Gopalakrishnan <kishore96@gmail.com>
 Kiyohito Yamazaki <kyamaz@openql.org>
 Klaus Rettinghaus <klaus.rettinghaus@enote.com>
 Konrad Meyer <konrad.meyer@gmail.com>

sympy/tensor/tensor.py

@@ -3629,10 +3629,10 @@ def __getitem__(self, item):
 
     def _get_args_for_traditional_printer(self):
         args = list(self.args)
-        if (self.coeff < 0) == True:
+        if self.coeff.could_extract_minus_sign():
             # expressions like "-A(a)"
             sign = "-"
-            if self.coeff == S.NegativeOne:
+            if args[0] == S.NegativeOne:
                 args = args[1:]
             else:
                 args[0] = -args[0]

sympy/tensor/tests/test_printing.py

@@ -0,0 +1,13 @@
+from sympy.tensor.tensor import TensorIndexType, tensor_indices, TensorHead
+from sympy import I
+
+def test_printing_TensMul():
+    R3 = TensorIndexType('R3', dim=3)
+    p, q = tensor_indices("p q", R3)
+    K = TensorHead("K", [R3])
+
+    assert repr(2*K(p)) == "2*K(p)"
+    assert repr(-K(p)) == "-K(p)"
+    assert repr(-2*K(p)*K(q)) == "-2*K(p)*K(q)"
+    assert repr(-I*K(p)) == "-I*K(p)"
+    assert repr(I*K(p)) == "I*K(p)"