标签:idt 组成 dex st3 pytho nes ima max one
1.capitalize():首字母大写,其余小写,eg:
test = "fEI yinG" result = test.capitalize() print(result)
输出:
Fei ying
2.upper():所有英文字母大写,eg:
test = "fEI yinG" result = test.upper() print(result)
输出:
FEI YING
3.title():每个单词的首字母大写,其余部分小写,eg:
test = "fei yiNg" result = test.title() print(result)
输出:
Fei Ying
4.casefold():全部小写,包括除英文以外的,如希腊字母等,eg:
test = "fEI yinG Σ"
result = test.casefold()
print(result)
输出:
fei ying σ
5.lower():全部小写,只能是英文,eg:
test = "fEI yinG" result = test.lower() print(result)
输出:
fei ying
6.center():居中显示,需传入参数width,width值规定字符串总的长度,必须为整数,默认参数fillchar=None,fillchar填充,默认空格,eg:
test = "feiying" result = test.center(20) print(result)
输出:
feiying
eg:
test = "feiying" result = test.center(20,"*") print(result)
输出:
******feiying*******
7.count():统计子序列出列的次数,需传入一个子序列sub,默认参数start=None,end=None,用于指定索引范围,左闭右开,eg:
test = "feiying"
result1 = test.count("i")
result2 = test.count("i", 1, 3)
print(result1)
print(result2)
输出:
2
1
8.encode():以 encoding 指定的编码格式编码字符串,eg:
test = "feiying" result = test.encode(encoding="utf-8", errors=‘strict‘) print(result)
输出:
b‘feiying‘
9.expandtabs():默认参数tabsize=8,以8个字符进行分割,如有\t,不足8个字符,\t补足8个,tabsize的值可以自定义,eg:
test = "name\taddress\tqq\nfeiying\tdongguan\t123456\nlisi\tshenzhen\t456789" result = test.expandtabs(15) print(result)
输出:
name address qq feiying dongguan 123456 lisi shenzhen 456789
10.find():查找子序列首次出现的索引,从左边开始查找,如没有找到返回-1,有两个默认参数start=None,end=None,用于指定查找的索引范围,左闭右开,eg:
test = "feiying" result = test.find("i", 0, 3) print(result)
输入:
2
11.rfind():查找子序列首次出现的索引,从右边开始查找,如没有找到返回-1,有两个默认参数start=None,end=None,用于指定查找的索引范围,左闭右开,eg:
test = "feiying" result = test.rfind("i") print(result)
输出:
4
12.index():用法同find(),如没有找到子序列,则报错,eg:
test = "feiying" result = test.index("i", 0, 3) print(result)
输出:
2
13.rindes():用法同rfind(),如没有找到子序列,则报错,eg:
test = "feiying" result = test.rindex("i") print(result)
输出:
4
14.format():需传入字符串参数或字典,用于填充字符串中出现的{},{}数量和参数个数对应,按顺序填充,eg1:
test = "I am {},age:{}" result = test.format("feiying", "23") print(result)
输出:
I am feiying,age:23
指定参数值:eg2:
test = "I am {name},age:{age}" result = test.format(name="feiying", age="23") print(result)
输出:
I am feiying,age:23
传入字典,eg3:
test = "I am {name},age:{age}" result = test.format(**{"name": "feiying", "age": "23"}) print(result)
输出:
I am feiying,age:23
15.format_map():传入一个字典,用于填充字符串中出现的{},eg:
test = "I am {name},age:{age}" result = test.format_map({"name": "feiying", "age": "23"}) print(result)
输出:
I am feiying,age:23
16.join():用于字符串拼接,使用时需在方法前写一个字符或字符串,eg:
test = "fei ying" result1 = "*".join(test) result2 = "_".join(test) print(result1)
print(result2)
输出:
f*e*i* *y*i*n*g
f_e_i_ _y_i_n_g
17.zfill():字符串靠右显示,左边用0填充,需传入width的值,width指定字符串长度,如width的值少于字符串长度,则输出整个字符串,eg:
test = "fei ying" result1 = test.zfill(6) result2 = test.zfill(15) print(result1) print(result2)
输出:
fei ying
0000000fei ying
18.ljust():字符串居左显示,如传入参数width,用于指定字符串长度,默认参数fillchar=None,fillchar填充,默认空格,eg:
test = "fei ying"
result1 = test.ljust(15, "*")
result2 = test.ljust(15)
print(result1)
print(result2)
输出:
fei ying*******
fei ying
19.rjust():字符串居右显示,如传入参数width,用于指定字符串长度,默认参数fillchar=None,fillchar填充,默认空格,eg:
test = "fei ying" result1 = test.rjust(15, "*") result2 = test.rjust(15) print(result1) print(result2)
输出:
*******fei ying
fei ying
20.lstrip():默认去除左边空白字符包含\t,\n,默认参数chars=None,如指定chars的值,则从左边第一个字符开始匹配,输出字符串中去除chars后的部分,如原字符串中匹配不到chars,则输出原字符串,eg:
result1 = test1.lstrip()
result2 = test2.lstrip("fe")
result3 = test2.lstrip("ei")
print(result1)
print(result2)
print(result3)
输出:
fei ying
i ying
fei ying
21.rstrip():默认去除右边空白字符包含\t,\n,默认参数chars=None,如指定chars的值,则从右边第一个字符开始匹配,输出字符串中去除chars后的部分,如原字符串中匹配不到chars,则输出原字符串,eg:
test1 = " fei ying " test2 = "fei ying" result1 = test1.rstrip() result2 = test2.rstrip("ng") result3 = test2.rstrip("in") print(result1) print(result2) print(result3)
输出:
fei ying
fei yi
fei ying
22.strip():默认去除左右边空白字符包含\t,\n,默认参数chars=None,如指定chars的值,则从左右边第一个字符开始匹配,输出字符串中去除chars后的部分,如原字符串中匹配不到chars,则输出原字符串,eg:
test1 = " fei ying "
test2 = "fei ying"
result1 = test1.strip()
result2 = test2.strip("fng")
result3 = test2.strip("ei yin")
print(result1)
print(result2)
print(result3)
输出:
fei ying
ei yi
fei ying
23.partition():把字符串分为三部分,得到一个元组(head, sep, tail),需传入参数tep,从左边开始查找tep,从第一个tep分割,如字符串中无tep,得到的元组索引为1和2的值为‘‘,‘‘ ,eg:
test = "fei ying" result1 = test.partition("i") result2 = test.partition("ab") print(result1) print(result2)
输出:
(‘fe‘, ‘i‘, ‘ ying‘) (‘fei ying‘, ‘‘, ‘‘)
24.rpatition():把字符串分为三部分,得到一个元组(head, sep, tail),需传入参数tep,从右边开始查找tep,从第一个tep分割,如字符串中无tep,得到的元组索引为0和1的值为‘‘,‘‘eg:
test = "fei ying" result1 = test.rpartition("i") result2 = test.rpartition("ab") print(result1) print(result2)
输出:
(‘fei y‘, ‘i‘, ‘ng‘) (‘‘, ‘‘, ‘fei ying‘)
25.split():分割字符串,得到一个列表,需传入参数tep,从左边开始查找tep,以tep为界分割字符串,默认参数maxsplit=-1,maxsplit用于指定分割次数,eg:
test = "fei ying in fei ying" result1 = test.split("i") result2 = test.split("i", 3) print(result1) print(result2)
输出:
[‘fe‘, ‘ y‘, ‘ng ‘, ‘n fe‘, ‘ y‘, ‘ng‘] [‘fe‘, ‘ y‘, ‘ng ‘, ‘n fei ying‘]
26.rsplit():分割字符串,得到一个列表,需传入参数tep,从右边开始查找tep,以tep为界分割字符串,默认参数maxsplit=-1,maxsplit用于指定分割次数,eg:
test = "fei ying in fei ying" result1 = test.rsplit("i") result2 = test.rsplit("i", 3) print(result1) print(result2)
输出:
[‘fe‘, ‘ y‘, ‘ng ‘, ‘n fe‘, ‘ y‘, ‘ng‘] [‘fei ying ‘, ‘n fe‘, ‘ y‘, ‘ng‘]
27.splitlines():默认以\n对字符串进行分割,得到一个列表,默认参数keepends=None,keepends为bool值,默认为False分割后不保留\n, 如为True保留\n,eg:
test = "fei\nying" result1 = test.splitlines() result2 = test.splitlines(True) print(result1) print(result2)
输出:
[‘fei‘, ‘ying‘] [‘fei\n‘, ‘ying‘]
28.replace():字符串替换,需传入参数原字符串,新字符串,默认参数count=None,count用于指定替换的次数,eg:
test = "fei fei fei fei ying" result1 = test.replace("ei", "love") result2 = test.replace("ei", "love", 2) print(result1) print(result2)
输出:
flove flove flove flove ying
flove flove fei fei ying
29.swapcase():大小写转换,小写转化为大写,大写转化为小写,eg:
test = "FeI YinG" result1 = test.swapcase() result2 = result1.swapcase() print(result1) print(result2)
输出:
fEi yINg
FeI YinG
30.maketrans():用于建立映射关系,一般和translate()一起使用,eg:
str1 = "abcd" str2 = "1234" result1 = str.maketrans(str1, str2) str3 ="globle as bind" result2 = str3.translate(result1) print(result1) print(result2)
输出:
{97: 49, 98: 50, 99: 51, 100: 52}
glo2le 1s 2in4
31.translate():用于取映射关系的值,实例同30
32.endswith():判断是否以某个字符串结尾,参数suffix需传入一个字符串,默认参数start=None,end=None,用于指定索引范围,左闭右开,得到的是bool值,eg:
test = "fei ying"
result1 = test.endswith("in")
result2 = test.endswith("ing")
result3 = test.endswith("in", 0, 7)
print(result1)
print(result2)
print(result3)
输出:
False
True
True
33.startswith:判断是否以某个字符串结尾,参数suffix需传入一个字符串,默认参数start=None,end=None,用于指定索引范围,左闭右开,得到的是bool值,eg:
test = "fei ying" result1 = test.startswith("ei") result2 = test.startswith("fe") result3 = test.startswith("ei", 1, 7) print(result1) print(result2) print(result3)
输出:
False
True
True
34.isalnum():判断是否为字母或数字,得到bool值,eg:
test = "adf1232②二" result = test.isalnum() print(result)
输出:
True
35.isalpha():判断是否为字母,得到bool值,eg:
test = "feiying" result = test.isalpha() print(result)
输出:
True
36.isdecimal():判断是否为数字,主要针对十进制数判断,得到bool值,eg:
test1 = "1232" test2 = "123②" test3 = "1232②二" result1 = test1.isdecimal() result2 = test2.isdecimal() result3 = test3.isdecimal() print(result1, result2, result3)
输出:
True False False
37.isdigit():判断是否为数字,针对十进制数及特殊数字如②判断不包括汉字数字一二...,得到bool值,eg:
test1 = "1232" test2 = "123②" test3 = "1232②二" result1 = test1.isdigit() result2 = test2.isdigit() result3 = test3.isdigit() print(result1, result2, result3)
输出:
True True False
38.isnumeric():判断是否为数字,针对十进制数及特殊数字如②判断包括汉字数字一,二...,得到bool值,eg:
test1 = "1232" test2 = "123②" test3 = "1232②二" result1 = test1.isnumeric() result2 = test2.isnumeric() result3 = test3.isnumeric() print(result1, result2, result3)
输出:
True True True
39.isidentifier():判断是否为python中的标识符,标识符由字母、数字及下划线组成,且必须以字母或下划线开始,得到bool值,eg:
test1 = "456" test2 = "_dfa12" result1 = test1.isidentifier() result2 = test2.isidentifier() print(result1, result2)
输出:
False True
40.islower():判断字符串是否为全部为小写,得到bool值,eg:
test = "fei ying"
result = test.islower()
print(result)
输出:
True
41.isprintable():判断字符串是否有不可显示的部分,主要指\t 、\n,字符串中包含\t、\n则返回False,得到bool值,eg:
test = "Fei \nying" result = test.isprintable() print(result)
输出:
False
42.isspace():判断字符串是否为全部为空格,得到bool值,eg:
test = "fei ying" result = test.isspace() print(result)
输出:
False
43.istitle():判断字符串是否为全部首字母大写,得到bool值,eg:
test = "Fei ying" result = test.istitle() print(result)
输出:
False
44.issupper():判断字符串是否为全部为大写,得到bool值,eg:
test = "Fei ying" result = test.istitle() print(result)
输出:
False
标签:idt 组成 dex st3 pytho nes ima max one
原文地址:https://www.cnblogs.com/xieliuxiang/p/9231711.html