Pandas中head( )函数_pandas head

Pandas读取数据之后使用pandas的head()函数的时候，来观察一下读取的数据

head( )函数只能读取前五行数据如下图所示

在查看这个head()函数的具体实现如下：

 def head(self, n=5):
        """
        Return the first `n` rows.
        This function returns the first `n` rows for the object based
        on position. It is useful for quickly testing if your object
        has the right type of data in it.
        Parameters
        ----------
        n : int, default 5
            Number of rows to select.
        Returns
        -------
        obj_head : same type as caller
            The first `n` rows of the caller object.
        See Also
        --------
        DataFrame.tail: Returns the last `n` rows.
        Examples
        --------
        >>> df = pd.DataFrame({'animal':['alligator', 'bee', 'falcon', 'lion',
        ...                    'monkey', 'parrot', 'shark', 'whale', 'zebra']})
        >>> df
              animal
        0  alligator
        1        bee
        2     falcon
        3       lion
        4     monkey
        5     parrot
        6      shark
        7      whale
        8      zebra
        Viewing the first 5 lines
        >>> df.head()
              animal
        0  alligator
        1        bee
        2     falcon
        3       lion
        4     monkey
        Viewing the first `n` lines (three in this case)
        >>> df.head(3)
              animal
        0  alligator
        1        bee
        2     falcon
        """
 
        return self.iloc[:n]

从中可以看出默认的时候是查看5行，

如果想输出3行或者多行