钓草鱼技巧,西安翻译学院分数线,宋茜厉旭最强情侣
#int----->str s = 1 i = str(s) print(i) #str----->int s = '123' i = int(s) print(i) #int------->bool i = 3 b = bool(i) print(b)
# s = '' ------>fasle
#非空字符串都是true
#s = "0" --------->true
切片:顾头不顾尾
s = 'abcdlsesrf'
s1 = s[0]
print(s1)
s2 = s[2]
print(s2)
s3 = s[0:3] #顾头不顾定
print(s3)
s4 = s[-1]
print(s4)
s5 = s[0:]
print(s5)
s6 = s[:]
print(s6)
s7 = s[0:5:2]
print(s7)
s8 = s[3::-1]
print(s8)
s9 = s[3::-2]
print(s9)
s10 = s[-1::-1]
print(s10)
s10 = s[::-1]
print(s10)
a
c
abc
f
abcdlsesrf
abcdlsesrf
acl
dcba
db
frsesldcba
frsesldcba
s = 'alexusir' s1 = s.capitalize() #首字母大写 print(s1)
alexusir
s2 = s.upper() #全部字母大写 print(s2)
############ alexusir
s3 = s.lower() #全部字母小写 print(s3)
alexusir
s4 = s.swapcase() #字母大小写翻转 print(s4)
alexusir
每个隔开(特殊字符或者数字)的单词的字母大写
s = 'alex open user' s5 = s.title() print(s5) ########### alex open user
居中和填充
s = 'alexuser' s6 = s.center(20,'#') #居中和填充 print(s6) ######alexuser######
table 键位
s = 'all\tuser' s7 = s.expandtabs() #table键 print(s7) all user
字符长度
s = '123dfjlasjflasjfklasjf地方' s8 = len(s) print(s8) 24
判断字符串中以什么开头和结尾
s = 'alexwusir' s9 = s.startswith('alex') print(s9) true
s = 'alexwusir' s9 = s.startswith('alex') print(s9) s10 = s.startswith('u',5) print(s10) true true
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