清空dataframe

清空一个DataFrame可以使用以下方法:
1. 使用空的DataFrame替换原有的DataFrame
df = pd.DataFrame() [1]
2. 使用drop方法删除所有行
df = df.drop(df.index) [1]
3. 使用空值替换所有值
df = df.replace(np.nan, '') [3]

以上是三种常用的清空DataFrame的方法，可以根据具体需求选择适合的方法进行操作。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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