字串下常用的工具

text = "love"

text = text.capitalize()
print(text)
輸出：love

text = "love"

text = text.lower()
print(text)
輸出：love

text = "abcdefg"

text = text.lower()
print(text)
輸出：abcdefg

text = "love"

text = text.center(10,"*")
print(text)
輸出：***love***

text = "love"

text = text.ljust(10,"*")
print(text)
輸出：love******

text = "love"

text = text.rjust(10,"*")
print(text)
輸出：******love

text = "lovelovelove"

text = text.count("o")
print(text)
輸出：3

text = "love"

text = text.endswith("o")
print(text)
輸出：false

text = "lovelove"

text = text.find("e")
print(text)
輸出：3　　　　#返回的是下標(索引)

text = "i am , my age is "

text = text.format(name = "jhon", age = 18)
print(text)
輸出：i am jhon, my age is 18

text = "i am , my age is "

text = text.format("jhon",18)
print(text)
輸出：i am jhon, my age is 18

text = "name\temail\tphone"

text = text.expandtabs(8)
print(text)
輸出：name    email   phone

text = "ilove39234__！"

text = text.isalnum()
print(text)
輸出：false

text = "i love python" 

text.title()
print(text)
輸出：i love python

1 text = "我是乙隻兔子"

2 t = "_"
3 text = t.join(text)
4 print(text)

輸出 ：我_是_一_只_兔_子

1 text = "    ldfiej  es  \t"

2 text = text.strip()
3 print(text)
#去除首位空白字元
輸出 ：flejli  es

1 text = "abcdefgh"

2 text = text.partition("d")
3 print(text)
輸出：('abc', 'd', 'efgh')

text = "abcdabcdabcd"

text.split("c")
['ab', 'dab', 'dab', 'd']

text = "abcd\nab\ncd\tabc\ndab"

text.splitlines(false)
輸出：['abcd', 'ab', 'cd\tabc', 'dab']

text = "abcd\nab\ncd\tabc\ndab"

text.splitlines(true)
['abcd\n', 'ab\n', 'cd\tabc\n', 'dab']

a = "abcdabcdabcd"

a.replace("ab","12")
輸出：'12cd12cd12cd'

test = "python3" 

t1 = test[0] #取單個字元
t2 = test[0:2] #取乙個範圍內 0=< <2 
t3 = test[0:-1] #-1代表最後一位
t4 = test[:3] # : 冒號前面不寫預設為0
t5 = test[0:] # : 冒號後面不寫預設為結尾
print("t1 = ",t1)
print("t2 = ",t2)
print("t3 = ",t3)
print("t4 = ",t4)
print("t5 = ",t5)
結果分別為：
t1 = p
t2 = py
t3 = python
t4 = pyt
t5 = python3

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