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代码示例：（标识：demo_python_ref_keyword_del_2）
运行代码
demo_python_ref_keyword_del_2.py
x = "hello" del x print(x)
运行结果：
<!DOCTYPE html><html><head><meta charset="utf-8"><title>Python Result</title><style>*{margin:0;padding:0}body{background:#000;color:#fff;line-height:1.5;font-family:consolas,"courier new",monospace}#python_result{padding:8px}</style></head><body><div id="python_result">C:\Users\My Name>python demo_python_ref_keyword_del_2.py<br>Traceback (most recent call last):<br> File "demo_python_ref_keyword_del_2.py", line 5, in <modulegt;<br> print(x)<br> NameError: name 'x' is not defined</div></body></html>
