Python学习笔记——切片操作

最新推荐文章于 2024-07-18 08:48:10 发布

原创最新推荐文章于 2024-07-18 08:48:10 发布 · 708 阅读

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本文详细解释了Python中字符串切片的基本用法，包括正负步长、默认值及边界处理，通过具体实例展示了如何使用字符串切片进行高效操作。

#slice[start:stop:step]
# 0 represent the left end of the sequence, -1 represents the right end of the sequence.
mystring = "my string"
#if the sign of the step is negative, then
#the default value of the start is -1, and the default value of the stop is zeor.
mystring[::-1] #'gnirts ym'
mystring[:3:-1] #'gnirt'
mystring[3::-1] #'s ym'

#if the sign of the step is positive, then
#the default value of the start is 0, and the defalut value of the stop is -1.
mystring[::1] #'my string'
mystring[:3:1] #'my '
mystring[3::1] #'string'

# start(0) ------- stop(-1), if the sign of the step is positive.
# stop(0) -------- start(-1), if the sign of the step is negative.