Lettuce Datatable

让我们想象一下编写MVC应用程序。在编写测试时，你将会遇到一种情况，有一些模型必须添加到数据库中，可能也需要检查这些模型的新状态。
这意味着当你用Lettuce编写测试时，在步骤中处理数据将非常有用。
步骤表展示如下

Feature: bill students alphabetically
  In order to bill students properly
  As a financial specialist
  I want to bill those which name starts with some letter

  Scenario: Bill students which name starts with "G"
    Given I have the following students in my database:
      | name     | monthly_due | billed |
      | Anton    | $ 500       | no     |
      | Jack     | $ 400       | no     |
      | Gabriel  | $ 300       | no     |
      | Gloria   | $ 442.65    | no     |
      | Ken      | $ 907.86    | no     |
      | Leonard  | $ 742.84    | no     |
    When I bill names starting with "G"
    Then I see those billed students:
      | name     | monthly_due | billed |
      | Gabriel  | $ 300       | no     |
      | Gloria   | $ 442.65    | no     |
    And those that weren't:
      | name     | monthly_due | billed |
      | Anton    | $ 500       | no     |
      | Jack     | $ 400       | no     |
      | Ken      | $ 907.86    | no     |
      | Leonard  | $ 742.84    | no     |

在上面的例子中有4个步骤，其中3个包含表。
现在让我们想象，我们将用Django写一些步骤定义来使用这些表。

from lettuce import step
from school.models import Student

@step('I have the following students in my database:')
def students_in_database(step):
    for student_dict in step.hashes:
        person = Student(**student_dict)
        person.save()

获取表的第一行或最后一行的便利函数呢？！

from lettuce import step
from school.models import Student

@step('I have the following students in my database:')
def students_in_database(step):
    person1 = Student(**step.hashes.first)
    person2 = Student(**step.hashes.last)

    person1.save()
    person2.save()

很简单，是吧？！
每一步都有一个属性调用一个列表词典的哈希值。每个字典中，表头为键，每一行的值。
换句话说，Lettuce将这个表等同于字典传递在第一步

@step('I have the following students in my database:')
def students_in_database(step):
    assert step.hashes == [
        {
            'name': 'Anton',
            'monthly_due': '$ 500',
            'billed': 'no'
        },
        {
            'name': 'Jack',
            'monthly_due': '$ 400',
            'billed': 'no'
        },
        {
            'name': 'Gabriel',
            'monthly_due': '$ 300',
            'billed': 'no'
        },
        {
            'name': 'Gloria',
            'monthly_due': '$ 442.65',
            'billed': 'no'
        },
        {
            'name': 'Ken',
            'monthly_due': '$ 907.86',
            'billed': 'no'
        },
        {
            'name': 'Leonard',
            'monthly_due': '$ 742.84',
            'billed': 'no'
        },
    ]

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