dataframe对一列的apply

在DataFrame中，可以对一列使用apply方法来应用一个函数。例如，通过以下代码可以将函数应用于DataFrame中的列：

df['D'] = df['A'].apply(lambda x: 'yes' if x > 50 else 'no')

这将在DataFrame的新列'D'中，根据'A'列的值是否大于50，赋予相应的'yes'或'no'。请注意，在这个例子中，我们将lambda函数应用于'A'列。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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