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‎rst/ch02/19.rst

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22 计算表达式
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-------------
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将字符串str 当成有效的表达式来求值并返回计算结果取出字符串中内容
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.. code:: python
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In [1]: s = "1 + 3 +5"
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...: eval(s)
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...:
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Out[1]: 9
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.. _header-n1382:

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