fixed compilation of the python wrapper

doc/optimization.md

@@ -15,6 +15,12 @@ functions, but once you have established, that your code works as expected you m
 used by your project with one compiled with the `-D XERUS_DISABLE_RUNTIME_CHECKS` flag.
 
 ## Use c++ instead of Python
+The interface between the languages python and c++ makes it necessary to perform operations for the sole purpose of compatibility
+between the otherwise incompatible languages. Often this includes copies of vectors of integers (whenever dimensions are specified
+or queried) and sometimes even deep copies of whole tensors (`.from_ndarray()` and `.to_ndarray()`). The only way to get rid of
+this overhead is to write your appliation in c++ instead of python. Most instructions that `xerus` offers for python look very
+similar in c++, so a transition might be simpler than you think. Simply check out the rest of the tutorials to compare the code
+snippets.
 
 ## Compiling Xerus with High Optimizations
 Per default the library already compiles with high optimization settings (corresponding basically to `-O3`) as there is rarely

src/xerus/python/python.cpp

@@ -487,7 +487,7 @@ BOOST_PYTHON_MODULE(xerus) {
 				"value : int"
 			)
 			.def("remove_slate", &Tensor::remove_slate,
-				((arg("mode"), arg("pos")),
+				(arg("mode"), arg("pos")),
 				"Removes a single slate from the Tensor, reducing dimension[mode] by one."
 				parametersDocstr
 				"mode : int\n"