Python 中的列表

Python 金融入门

Adina Howe

Professor

列表——方括号 [ ]

months = ['January', 'February', 'March', 'April', 'May', 'June']
Python 金融入门

Python 从 0 开始计数

list_figure

Python 金融入门

子集列表

months = ['January', 'February', 'March', 'April', 'May', 'June']

months[0]

'January'

months[2]

'March'
Python 金融入门

列表的负索引

months = ['January', 'February', 'March', 'April', 'May', 'June']

months[-1]

'June'

months[-2]

'May'
Python 金融入门

用切片选取多个列表元素

切片语法

# 包含起始位置，直到结束位置（不含）
mylist[startAt:endBefore]

示例

months = ['January', 'February', 'March', 'April', 'May', 'June']

months[2:5]

['March', 'April', 'May']

months[-4:-1]

['March', 'April', 'May']
Python 金融入门

列表的扩展切片

months = ['January', 'February', 'March', 'April', 'May', 'June']

months[3:]

['April', 'May', 'June']

months[:3]

['January', 'February', 'March']
Python 金融入门

步长切片

# 包含起始位置，直到结束位置（不含）
mylist[startAt:endBefore:step] 

months = ['January', 'February', 'March', 'April', 'May', 'June']

months[0:6:2]

['January', 'March', 'May']

months[0:6:3]

['January', 'April']
Python 金融入门

Passons à la pratique !

Python 金融入门

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