Python sixth day (string-index and Shard)

Indexes and Shards

>>> Wu = ' wuang '

>>> Wu[0]

' W '

>>> Wu[1]

' U '

>>> wu[1:]

' Uang '

>>> Wu[1:3]

' UA '

>>> Wu[-1]

' G '

>>> Wu[:-1]

' Wuan '

Index: Wu[i]

The first element has an offset of 0

[0]: first element

[-1]: last element

Shard Wu[i:j]

Upper boundary (i) does not contain

If I is not given, the default is 0

Wu[1:3]

Wu[:3]

WU[:-1]

wu[:]

Shards also have a limit value

Called Stepping

WU[I:J:K]

Offset to I until j-i, indexed once per k element

Wu[1:4:2]

The result is

>>> Wu[1:4:2]

' UN '

Every 2, i.e.

Wuang

U n

WU[::-1]

Step-in effect

Indicates that the Shard is right-to-left instead of left-to-right

A negative step is equivalent to a two-border reciprocal exchange

>>> Wu[::-1]

' Gnauw '

>>> ' Wuang ' [1:4]

' Uan '

>>> ' Wuang ' [Slice (1,4)]

' Uan '

>>> ' Wuang ' [::-1]

' Gnauw '

>>> ' Wuang ' [Slice (none,none,-1)]

' Gnauw '

This article is from the "Don't Ang" blog, please be sure to keep this source http://wuang.blog.51cto.com/9559762/1606442

Python sixth day (string-index and Shard)