Python3表示记录_数据库列表

MR.ILen

于 2019-11-14 14:54:30 发布

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分类专栏： Python基础

本文链接：https://blog.youkuaiyun.com/EedWeek/article/details/103067164

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本文介绍了使用Python进行列表操作和数据处理的方法，包括遍历、追加元素、获取元素长度及利用列表推导式和map函数提取特定数据。通过实例展示了如何处理包含人员信息的列表，如打印姓名、调整薪资并提取薪资数据。

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>>> people = [bob,sue]
>>> for person in people:
... print(person)
...
['Bob Smith', 42, 30000, 'software']
['Sue Jones', 45, 50000.0, 'hardware']

>>> people[1][0]
'Sue Jones'
>>> for person in people:
... print(person[0].split()[-1])
... person[2]*=1.20
...
Smith
Jones
>>> for person in people: print(person[2])
...
36000.0
60000.0

>>> pays = [person[2] for person in people]
>>> pays
[36000.0, 60000.0]

>>> pays = map((lambda x:x[2]),people)
>>> pays
<map object at 0x7f05446b1240>
>>> list(pays)
[36000.0, 60000.0]

>>> bob = ['Bob Smith',42,30000,'software']
>>> sue = ['Sue Jones',45,40000,'hardware']
>>> people = [bob,sue]
>>> people.append(['Tom',50,0,None])
>>> len(people)
3
>>> people[-1][0]
'Tom'
>>>