Bug:CalledProcessError: Command ‘[‘dot‘, ‘-Tpdf‘, ‘-O‘, [stderr: b‘Format: 「pdf「 not recognized.

Bug：CalledProcessError: Command ‘[‘dot’, ‘-Tpdf’, ‘-O’, ‘BinaryTree.gv’]’ returned non-zero exit status 1. [stderr: b’Format: 「pdf」 not recognized. Use one of:\r\n’] jupyter notebook運行代碼繪製二叉樹圖時遇到的bug

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