资源简介

(共24张PPT)
3.2 Python程序设计
6、字符串
python
>>>51=Welcome
>>>52=Welcome
>>>id(s1)
2077797526752
>>>id(S2)
2877797526752
s11
Welcome
S2
>>>s=str( Welcome")
>>>s
Welcome
>>>1en(s)
>>>max( s
>>>min(s
>>>
>>>s
Welcome
>>>s[e]
>>>s[6]
>>>s[16]
raceback ( most recent call last):
File ",line 1, in
s[16]
IndexError: string index out of range
>>>
>>>s=Welcome
>>>s[-1]
>>>s[-1+1en(s)]
>>>s[-3]
>>>s[-3+1en(s)]
>>>
>>>s「8
raceback ( most recent call last):
File" " line 1, in
s[0]
W
ypeError: str object does not support item assignment
>>>
>>>s=Welcome
>>>s[1:4]
elc
>>>s=Welcome
>>>s[:6]
Welcom
>>>s[e:6]
Welcom
>>>s[4:]
ome
>>>s[4:1en(s)]
ome
>>>s[::2]
Wloe
>>>s=Welcome
>>>s[1:-1]
e⊥com
>>>s[1:-1+1en(s)]
elcom
>>>s=Welcome
>>>s[3:3]
>>>s[2:16]
Icome
>>>s[2:1en(s)]
i1come'
>>>s1=Welcome
>>>s2=Python
>>>s3=s1+"to"+s2
>>>s3
Welcome to Python
>>>s4=3*s1
>>>s4
WelcomeWel comeWel come
>>>s5=s1*3
>>>s5
WelcomeWel comeWelcome
>>>s=Welcome
>>>come In s
True
>>>come not in s
False

展开更多......

收起↑