NameError: name 'sympy' is not defined啥意思

引用<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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- *1* *3* [Python函数调用出现NameError: name ‘xxx‘ is not defined的解决办法](https://blog.csdn.net/Wind_2028/article/details/116121427)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v92^chatsearchT0_1"}}] [.reference_item style="max-width: 50%"]
- *2* [NameError: name ‘torch‘ is not defined；from torch import nn导入模块错误](https://blog.csdn.net/PSpiritV/article/details/123590782)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v92^chatsearchT0_1"}}] [.reference_item style="max-width: 50%"]
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