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                #### 判斷構成元素 isalpha() \#判斷字符串是否全部由字母構成,若是,返回true,否則返回false \>>> "hello".isalpha() True \>>> "23hello".isalpha() False \>>> #### 分割 S.split( ) #將字符串根據某個分割符進行分割大S代表變量名 \>>> a="hello,world,hi,python" \>>> a.split(",") #根據逗號分割出每個字符串,可用于文本處理或表格處理中 \['hello', 'world', 'hi', 'python'\] \#分割出來的結果自動用逗號隔開,得到一個list列表的返回值 \>>> t1,t2,t3,t4=a.split(",") \>>> print(t1,t2,t3,t4) hello world hi python #### 去掉字符串里的空格 S.strip() \>>> a=" hello " \>>> a ' hello ' #hello的兩頭有空格 \>>> a.strip() 'hello' #去掉空格 \>>> a.lstrip() \#去掉左邊的空格 'hello ' \>>> a.rstrip() \#去掉右邊的空格 ' hello' #### 大小寫字母的轉化 S.upper( ) \#轉換為大寫字母 \>>> a ' hello ' \>>> a.upper() ' HELLO ' S.lower( ) \#轉換為小寫字母 \>>> b="WORLD" \>>> b.lower() 'world' \>>> \>>> a="hello world hi python" \#將所有單詞的首字母轉化為大寫,且轉換完之后進行判斷 \>>> a.title() 'Hello World Hi Python' \>>> b=a.title() \>>> b.istitle() \#istitle()用來判斷第一個字母是否為大寫, True \>>> a="HELLO" \>>> a.istitle() \#istitle()用來判斷第一個字母是否為大寫, False \>>> b="World" \>>> b.istitle() True \>>> join連接字符串 \>>> t="hello@world@hi@python" \>>> b=t.split("@") \#用@符號隔開t字符串 \>>> b \['hello', 'world', 'hi', 'python'\] \>>> c="+".join(b) \#將b中的字符串用+連接 \>>> print(c) hello+world+hi+python \>>> c=\["1","2","3","4"\] \#也可用數組元素表示 \>>> "+".join(c) '1+2+3+4' \>>>
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