python3笔记-str的常用操作方法

#-*- encoding:utf-8 -*-

s = 'dexterWang'
#首字母大写
s1 = s.capitalize()
print (s1)
#Dexterwang
#大写
s2 = s.upper()
#小写
s3 = s.lower()
print (s2,s3)
#DEXTERWANG dexterwang

#大小写翻转
s4 = s.swapcase()
print (s4)
#DEXTERwANG
x = 'this is big lie'

#标题输出，'This Is Big Lie'
x5 = x.title()
print (x5)
#This Is Big Lie

#居中，空白填充
x6 = x.center(20,'-')
print (x6)
#--this is big lie---

#长度计算
l = len(x)
print (l)
#15
'''
s = 'dexterWang'
print (s)
while True:
    enter = input('输入开头：')
    s9 = s.startswith(enter)
    if s9:
        print ('sucessful')
        break
    else:
        print ('failed')
        continue
#print (s9)
'''
#去空格
y = '  666 fuck   '
y1 = y.strip()
print (y1)



y2 = '  ++fuck%% 666++%%%'
y3 = y2.strip('+ %')
print (y3)
'''
s_str='Ac9SrT'
print ('验证码: %s' % s_str  )
while True:
    you_input = input('请输入验证码，不区分大小写:')
    if s_str.upper() == you_input.upper():
        print('输入成功')
        break
    else:
        print('请重新输入')
        continue
'''
i = 11
print(i.bit_length())
#4
u = str(i)
print (u,type(u))
#11 <class 'str'>
b = bool(i)
print (b)

c = True
d = int(c)
print (d)


#切片
s = 'ABCDLSESRF'
s11 = s[-1::-1]
print (s11)
#FRSESLDCBA

#文本转列表
h = '10.88.140.69,10.88.139.23,10.88.67.42'
n = h.split(',')
print (n)
#['10.88.140.69', '10.88.139.23', '10.88.67.42']
for i in n:
    print (i)

#10.88.140.69
#10.88.139.23
#10.88.67.42

#记数
a = 'national day'
z = a.count('a',2,20)
print (z)
#2