1. endswith() startswith()python
1 # 以什么什么结尾 2 # 以什么什么开始 3 test = "alex" 4 v = test.endswith('ex') 5 v = test.startswith('ex') 6 print(v)
2. expandtabs()git
1 test = "1\t2345678\t9" 2 v = test.expandtabs(6) 3 print(v,len(v))
3. find()api
1 # 从开始日后找，找到第一个以后，获取其未知 2 # > 或 >= 3 test = "alexalex" 4 # 未找到 -1 5 v = test.find('e') 6 print(v)
4. index()ide
1 # index找不到，报错 忽略 2 test = "alexalex" 3 v = test.index('a') 4 print(v)
5. format() format_map()spa
1 # 格式化，将一个字符串中的占位符替换为指定的值 2 test = 'i am {name}, age {a}' 3 print(test) 4 v = test.format(name='alex',a=19) 5 print(v) 6 7 test = 'i am {0}, age {1}' 8 print(test) 9 v = test.format('alex',19) 10 print(v) 11 12 # 格式化，传入的值 {"name": 'alex', "a": 19} 13 test = 'i am {name}, age {a}' 14 v1 = test.format(name='df',a=10) 15 print(v1) 16 v2 = test.format_map({"name": 'alex', "a": 19}) 17 print(v2)
6. isalnum().net
1 # 字符串中是否只包含 字母和数字 2 test = "er;" 3 v = test.isalnum() 4 print(v)
7.capitalize() 首字母大写3d
1 test = "sqy" 2 v = test.capitalize() 3 print(v)
8. casefold() lower() 全部变小写，casefold更牛逼，不少未知的对相应变小写code
1 test = "sqy" 2 v1 = test.casefold() 3 print(v1) 4 v2 = test.lower() 5 print(v2)
9. center() 置宽度，并将内容居中orm
1 # 20 代指总长度 2 # * 空白未知填充，一个字符，无关紧要 3 test = "sqy" 4 v = test.center(20,"中") 5 print(v)
10. ljust() rjust() zfill()blog
1 # test = "alex" 2 # v = test.ljust(20,"*") 3 # print(v) 4 5 # test = "alex" 6 # v = test.rjust(20,"*") 7 # print(v) 8 9 # test = "alex" 10 # v = test.zfill(20) 11 # print(v)
11. count() 去字符串中寻找，寻找子序列的出现次数
1 test = "aLexalexr" 2 v = test.count('ex') 3 print(v) 4 5 test = "aLexalexr" 6 v = test.count('ex',5,6) 7 print(v)
12. isalpha() 是不是字母，汉子
1 test = "as大多数df" 2 v = test.isalpha() 3 print(v)
13. isdecimal() isdigit() isnumeric() 当前输入是不是数字
1 test = "②" # 1，②,儿 2 v1 = test.isdecimal() 3 v2 = test.isdigit() 4 v3 = test.isnumeric() 5 print(v1,v2,v3)
14.isprintable() 是否存在不可显示的字符
1 # \t 制表符 2 # \n 换行 3 test = "gdds\tfdsfd" 4 v = test.isprintable() 5 print(v)
15. isspace() 判断是否所有是空格
1 test = " ass" 2 v = test.isspace() 3 print(v)
16. istitle() title() 判断是不是标题
1 test = "Return True if all cased characters in S are uppercase and there is" 2 v1 = test.istitle() 3 print(v1) 4 v2 = test.title() 5 print(v2) 6 v3 = v2.istitle() 7 print(v3)
17. join() 将字符串中的每个元素按照指定分隔符进行拼接
1 test = "你是风儿我是沙" 2 print(test) 3 t = ' ' 4 v = "_".join(test) 5 print(v)
18. islower() lower() isupper() upper()
1 test = "Alex" 2 v1 = test.islower() 3 v2 = test.lower() 4 print(v1, v2) 5 6 v1 = test.isupper() 7 v2 = test.upper() 8 print(v1,v2)
19. lstrip() rstrip() strip() 移除指定字符串 有限最多匹配
1 test = "\nxas12xa\n\txax1221axa " 2 v = test.lstrip('xa') 3 v = test.rstrip('9lexxexa') 4 v = test.strip('xa') 5 print(v) 6 7 test.lstrip() 8 test.rstrip() 9 test.strip() 10 # 去除左右空白 11 v = test.lstrip() 12 v = test.rstrip() 13 v = test.strip() 14 print(v) 15 print(test) 16 # 去除\t \n 17 v = test.lstrip() 18 v = test.rstrip() 19 v = test.strip() 20 print(v)
20. maketrans() translate() 对应关系替换
1 v = "asidufkasd;fiuadkf;adfkjalsdjf" 2 m = str.maketrans("aeiou", "12345") 3 new_v = v.translate(m) 4 print(new_v)
21. partition() rpartition() 分割为三部分
1 test = "testasdsddfg" 2 v = test.partition('s') 3 print(v) 4 v = test.rpartition('s') 5 print(v)
22. split() rsplit() splitlines()
1 test = "sqys" 2 v = test.split('s',2) 3 print(v) 4 v = test.rsplit() 5 print(v) 6 7 8 # 23 分割，只能根据，true，false：是否保留换行 9 # test = "asdfadfasdf\nasdfasdf\nadfasdf" 10 # v = test.splitlines(False) 11 # print(v)
23. swapcase() 大小写转换
1 test = "aLex" 2 v = test.swapcase() 3 print(v)
24. isidentifier() 字母，数字，下划线 ： 标识符 def class
1 a = "de12_f" 2 v = a.isidentifier() 3 print(v)
25.replace() 将指定字符串替换为指定字符串
1 test = "alexalexalex" 2 v = test.replace("ex",'bbb') 3 print(v) 4 v = test.replace("ex",'bbb',2) 5 print(v)
26.灰魔法
1、for循环
1 test = "返回到合肥东方红刚才修改" 2 # for 变量名 in 字符串: 3 # 变量名 4 # break 5 # continue 6 7 8 index = 0 9 while index < len(test): 10 v = test[index] 11 print(v) 12 13 index += 1 14 print('=======') 15 16 for zjw in test: 17 print(zjw) 18 19 test = "好方法个地方个地方刚发的" 20 for item in test: 21 print(item) 22 break 23 24 for item in test: 25 continue 26 print(item)
2、索引，下标，获取字符串中的某一个字符
1 test = "好方法个地方个地方刚发的" 2 v = test[3] 3 print(v)
3、切片
1 test = "好方法个地方个地方刚发的" 2 v = test[0:10] # 0=< <1 3 print(v)
4、获取长度
1 # Python3： len获取当前字符串中由几个字符组成 2 test = "好方法个地方个地方刚发的" 3 v = len(test) 4 print(v)
27. range() 获取连续或不连续的数字
1 # Python2中直接建立在内容中 2 # python3中只有for循环时，才一个一个建立 3 v = range(10) 4 v = range(3,10) 5 v = range(1,10,2) 6 # 帮助建立连续的数字,经过设置步长来指定不连续 7 v = range(0, 100, 5) 8 9 for item in v: 10 print(item)
28.zip()
1 # print(list(zip(('a','n','c'),(1,2,3)))) 2 # print(list(zip(('a','n','c'),(1,2,3,4)))) 3 # print(list(zip(('a','n','c','d'),(1,2,3)))) 4 # 5 # p={'name':'alex','age':18,'gender':'none'} 6 # print(list(zip(p.keys(),p.values()))) 7 # print(list(p.keys())) 8 # print(list(p.values())) 9 # 10 print(list(zip(['a','b','c'],'12345')))