capitalize（） 首字母大寫
a='someword' b=a.capitalize() print(b) —>Someword
casefold()&lower() 所有字母變小寫，casefold可將未知字符便小寫
a='someWORD' b=a.casefold() print(b) c=a.lower() print(c) —>someword —>someword
center(width,fillchar=None) 設置寬度，并將內容居中，空白未知填充，一個字符
a='someword' b=a.center(30,'*') print(b)
count(sub,start=None,end=None) 去字符串中尋找，尋找子序列的出現次數，可指定起止點
a='somewordsomeword' b=a.count(‘or') print(b) —>2
startswith(suffix,start=None,end=None)&endswith(suffix,start=None,end=None) 是否以XX開始/結束，可指定起止點
a='somewordsomeword' b=a.startswith(‘sa') c=a.endswith(‘ord') print(b) print(c) —>False —>True
find(sub,start=None,end=None) 尋找指定字符或字符串，并返回第一個位置，找不到返回-1，可指定起止點
a='somewordsomeword' b=a.find(‘me') print(b) —>2
format() 格式化，將一個字符串中的占位符替換為指定的值
test='I am {name},age {a}' v=test.format(name='alex',a=19) print(v) —>i am alex,age 19format_map() 格式化，傳入的值
test='iam{name},age{a}' v=test.format_map({“name”:'alex',”a”:19}) print(v) —>i am alex,age 19isalnum() 字符串中是否只包含字母和數字
a='asdfs123*' b=a.isalnum() print(b) —>False
expandtabs(tabsize=number) 將字符串以number分割，并將tab補入
a='asdfs123/t523fgbdf' b=a.expandtabs(5) print(b) —>asdfs123 523fgbdf
isalpha() 字符串中是只包含字母
a='asdfsfgbdf' b=a.isalpha() print(b) —>True
isdecimal()&isdigit()&isnumeric() 字符串中是只包含數字，isdigit更為強大，isnumeric還可識別中文
a='132132②二' b=a.isdecimal() c=a.isdigit() d=a.isnumeric() print(b) print(c) print(d) —>False —>False —>True
isprintable() 是否存在不可顯示的字符如換行符
a='sdfgdfg/t' b=a.isprintable() print(b) —>False
isspace() 判斷是否全部為空格
a='dsvsdv' b=a.isspace() print(b) —>False
istitle()&title() 判斷是否為標題，即首字母大寫&變為標題
a='follow uncased characters and lowercase characters only cased ones' b=a.istitle() print(b) c=a.title() print(c) —>False —>Follow Uncased Characters And Lowercase Characters Only Cased Ones
join(iterable) 將字符串中的每個元素按照指定分隔符進行拼接
a='一二三四五六七' print(a) b='*' c=b.join(a) print(c) —>一二三四五六七 —>一二三四五六七
ljust(width,fillchar=None)&rjust(width,fillchar=None) 向右/左填充字符
a='hello' b=a.ljust(20,'*') c=a.rjust(20,'*') print(b) print(c) —>hello*************** —>***************hello
islower()&lower() 判斷是是否為全小寫&變為全部小寫
a='Hello' b=a.islower() c=a.lower() print(b,c) —>False hello
isupper()&c=a.upper() 判斷是是否為全大寫&變為全部大寫
a='Hello' b=a.isupper() c=a.upper() print(b,c) —>False HELLO
lstrip(chars=None)&rstrip(chars=None)&strip(chars=None) 去除字符串左邊/右邊/兩邊的字符串，默認空格，換行等
a='Hello' b=a.lstrip() c=a.rstrip() d=a.strip() print(b) print(c) print(d) —>Hello —> Hello —>Hello
maketrans(*args,**kwargs)&translate(table) 按maketrans對應關系將translate中的字符串進行替換
a='asdgfrfbcvzxrentas' b=str.maketrans(‘xdsa','1234') c=a.translate(b) print(c) —> 432gfrfbcvz1rent43
partition(sep)&rpartition(sep) 將字符串按指定字符分割成3段/或從右開始
a='helwloasvxcwaewc' b=a.partition(‘w') c=a.rpartition(‘w') print(b) print(c) —>(‘hel', ‘w', ‘loasvxcwaewc') —>(‘helwloasvxcwae', ‘w', ‘c')
split(sep=None,maxsplit=-1)&rsplit(sep=None,maxsplit=-1) 將字符串按指定字符串分割，分割后不保留
a='helwloasvxcwaewc' b=a.split(‘w',2) c=a.rsplit(‘w') print(b) print(c) —>[‘hel', ‘loasvxc', ‘aewc'] —>[‘hel', ‘loasvxc', ‘ae', ‘c']
splitlines(keepends=None) 按照換行符進行分割，帶true參數保留換行符
a='helwloas/nvxcwaewc/nafgasdfs' b=a.splitlines() c=a.splitlines(True) print(b) print(c) —>[‘helwloas', ‘vxcwaewc', ‘afgasdfs'] —>[‘helwloas/n', ‘vxcwaewc/n', ‘afgasdfs']
startswith(prefix,start=None,end=None)&endswith(prefix,start=None,end=None) 判斷字符串是否以指定字符開始/結束，可指定起止點
a='aefsfsfeeav' b=a.startswith(‘ae') c=a.endswith(‘av',1,9) print(b) print(c) True —>False
swapcase() 小寫轉變為大寫
a='aefsfsfeeav' b=a.swapcase() print(b) —>AEFSFSFEEAV
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