Pandas 练习题 003

ID：

1. Download the dataset from address to your computer and unzip it.
    ```python
    ```
2. Use the tsv file and assign it to a dataframe called food
    ```python
    ```
3. See the first 5 entries
    ```python
    ```
4. What is the number of observations in the dataset?
    ```python
    ```
5. What is the number of columns in the dataset?
    ```python
    ```
6. Print the name of all the columns.
    ```python
    ```
7. What is the name of 105th column?
    ```python
    ```
8. What is the type of the observations of the 105th column?
    ```python
    ```
9. How is the dataset indexed?
    ```python
    ```
10. What is the product name of the 19th observation?
    ```python
    ```