python 中 while循环的语法如下
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"while" <a class="reference internal" href="https://docs.python.org/3/reference/expressions.html#grammar-token-expression"><code class="xref docutils literal notranslate"><span class="pre">expression</span></code></a> ":" <a class="reference internal" href="https://docs.python.org/3/reference/compound_stmts.html#grammar-token-suite"><code class="xref docutils literal notranslate"><span class="pre">suite</span></code></a> |
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["else" ":" <a class="reference internal" href="https://docs.python.org/3/reference/compound_stmts.html#grammar-token-suite"><code class="xref docutils literal notranslate"><span class="pre">suite</span></code></a>] |
其中只要 expressi[......]
