我刚刚下载了最新的Octave版本和我已经安装并加载的符号软件包，但是某些软件无法正常工作。 我编写的代码在形式上与我发现的at this link相等，所以我不知道自己在做什么错。
这是我写的代码：
syms r;
b=1/((r^2)*sqrt((r^2)-1));
B=int(b,r);
这是我在命令窗口中找到的：
Symbolic pkg v2.7.1: "python" isn't recognised as an internal or external command,
nor as an executable programm or a file batch.
error: Cannot run the Python executable "python"
Try "sympref diagnose" for more information.
error: called from
assert_have_python_and_sympy at line 61 column 7
python_ipc_popen2 at line 79 column 5
python_ipc_driver at line 59 column 15
python_cmd at line 164 column 11
valid_sym_assumptions at line 38 column 10
assumptions at line 82 column 7
syms at line 97 column 13
provaintegrazione at line 1 column 1