Add amrex::Print() Like Function (#174)

* Add amrex::Print() Like Function

Add `amr.Print(...)` that behaves like Python's `print()`,
but only prints on the AMReX IOProcessor.

* Test `amr.Print(...)`

* amr.Print(): Fallback to All if not Init

and warn

src/amrex/space1d/__init__.py

@@ -32,3 +32,12 @@
 #
 def d_decl(x, y, z):
     return (x,)
+
+
+def Print(*args, **kwargs):
+    """Wrap amrex::Print() - only the IO processor writes"""
+    if not initialized():
+        print("warning: Print all - AMReX not initialized")
+        print(*args, **kwargs)
+    elif ParallelDescriptor.IOProcessor():
+        print(*args, **kwargs)

src/amrex/space2d/__init__.py

@@ -32,3 +32,12 @@
 #
 def d_decl(x, y, z):
     return (x, y)
+
+
+def Print(*args, **kwargs):
+    """Wrap amrex::Print() - only the IO processor writes"""
+    if not initialized():
+        print("warning: Print all - AMReX not initialized")
+        print(*args, **kwargs)
+    elif ParallelDescriptor.IOProcessor():
+        print(*args, **kwargs)

src/amrex/space3d/__init__.py

@@ -32,3 +32,12 @@
 #
 def d_decl(x, y, z):
     return (x, y, z)
+
+
+def Print(*args, **kwargs):
+    """Wrap amrex::Print() - only the IO processor writes"""
+    if not initialized():
+        print("warning: Print all - AMReX not initialized")
+        print(*args, **kwargs)
+    elif ParallelDescriptor.IOProcessor():
+        print(*args, **kwargs)

tests/test_utility.py

@@ -6,3 +6,8 @@
 def test_concatenate():
     pltname = amr.concatenate("plt", 1000, 5)
     assert pltname == "plt01000"
+
+
+def test_print():
+    print("hello from everyone")
+    amr.Print("byeee from IO processor")