python字符串的整理

test = "aLex"
v = test.capitalize() #首字母大写
print(v)
v1 = test.casefold() #小写
print(v1)
v2 = test.lower()
print(v2) #小写 但只能英文

 宽度，周围填充#
v = test.center(20,'#')
print(v)

v = test.count('L',1,3) #在字符串中寻找子序列出现的次数，可以设置起始与结束
print(v)

v = test.endswith('e')
print(v)

v = test.find('da',2,9)#找到字符串的第一个位置
print(v)

格式化 ，将一个字符串中的占位符替换为指定值
test = 'i am {name}, age {a}'
print(test)
v = test.format(name = 'alex',a = 19)
print(v)
 test = 'i am {name} , age{a}'
 print(test)
 v = test.format("Alex",19)
 print(v)

 v = test.format_map({'name':"lisa", 'a' : 19})
 print(v)

 test = 'ufasdad2211' #是否只包含数字跟字母
 v = test.isalnum()
 print(v)

 test = "name\tage\nlisa\t18\nJack\t20\n"
 v = test.expandtabs(10)#遇到制表符时对齐，空出行数
 print(v)
test = 'uiouio'
 v = test.isalpha()#是否是字母
 print(v)
 test = '②'
 v = test.isalnum()#是否是数字特殊的字符也算
 v1 = test.isdecimal() #是否是数字
v2 = test.isdigit()#是否是数字特殊的字符也算
 print(v,v1,v2)

 test = 'aLex'
 v = test.swapcase() #全部大写
 print(v)