Python 的列表

Python 金融入門

Adina Howe

Professor

列表：方括號 [ ]

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

Python 從 0 起始索引

list_figure

Python 金融入門

索引子集合列表

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

months[0]

'January'

months[2]

'March'
Python 金融入門

列表的負索引

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

months[-1]

'June'

months[-2]

'May'
Python 金融入門

用切片擷取多個元素

切片語法

# 包含起始，但不包含結束
mylist[startAt:endBefore]

範例

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

months[2:5]

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

months[-4:-1]

['March', 'April', 'May']
Python 金融入門

進階切片：省略端點

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

months[3:]

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

months[:3]

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

帶步長的切片

# 包含起始，但不包含結束
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 金融入門

一起來練習吧！

Python 金融入門

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