Python学习之路-string字符串的常用方法

大小写转换

 1 __author__ = "KuanKuan"
 2 print("name is JankinYu".capitalize())#转为首字母大写
 3 print("name is JankinYu".title())#转为标题形式   Name Is Jankinyu
 4 print("NAMW".lower())#转换为小写
 5 print("name".upper())#转换为大写
 6 print("Name".swapcase())#大写变小写小写变大写
 7 """
 8 输出结果：
 9 Name is jankinyu
10 Name Is Jankinyu
11 namw
12 NAME
13 nAME
14 """

字符串判断

 1 __author__ = "KuanKuan"
 2 print("name is JankinYu".startswith("name")) # 以...开头  如果正确则为True
 3 print("name is JankinYu".endswith("JankinYu"))#以...结尾  如果正确则为True
 4 print("asd".isalpha())#如果是字母则为True
 5 print("123".isdigit())#如果是数字则为True
 6 print("asd123".isalnum())#如果是数字或者字母则为True
 7 print("jjk".isidentifier())#判断是否为合法变量名合法为True
 8 print(" ".isspace())  # 空格 -->True
 9 print("My Name Is Jankinyu".istitle())  # 标题 -->True
10 print("My Name Is Jankinyu".isprintable())  # 可打印 tty file, drive file -->True
11 print("A".isupper())  # 大写 -->True
12 print("a".islower())  # 小写 -->True

输出显示

 1 __author__ = "KuanKuan"
 2 print(",".join(["1", "2", "3"]))  # 连接
 3 #  ->1,2,3
 4 print("name is JankinYu".split())  # 拆分为列表，默认拆分符为空格
 5 #  ->[‘name‘, ‘is‘, ‘Alex‘]
 6 print("name\n is\r\n  JankinYu".splitlines())  # 拆分为列表，默认拆分符为回车
 7 #  ->[‘name‘, ‘ is‘, ‘ Alex‘]
 8 print("name".center(50, "-"))  # 内容居中，两侧填充
 9 # ->-----------------------name-----------------------
10 print("name".ljust(50, "*"))  # 内容靠左，以*填充
11 # ->name**********************************************
12 print("name".rjust(50, "-"))  # 内容靠右，以-填充
13 # ->----------------------------------------------name
14 print("name".zfill(50))  # 内容靠右，以0填充
15 # ->0000000000000000000000000000000000000000000000name
16 print("name is\t  JankinYu".expandtabs(tabsize=18))  # 设置‘\t‘宽度
17 # ->name is               JankinYu
18 print("I am from {city},and {year} years old".format(city="kuankuan", year=18))  # 格式化
19 # ->I am from Wuhan,and 18 years old
20 print("I am from {city},and {year} years old".format_map({"city": "kuankuan", "year": 18}))  # 字典参数格式化
21 # ->I am from Wuhan,and 18 years old
22 print("\nname".lstrip())  # 去除左侧回车和空格 ->name
23 print("name\n".rstrip())  # 去除右侧回车和空格 ->name
24 print("    name\n".strip())  # 去除两侧回车和空格 ->name
25 print("~~~~~~~~~~~~~~~~~~~~")

查找替换

 1 __author__ = "KuanKuan"
 2 p = str.maketrans("abc", "123")  # 创造翻译字典
 3 print(type(p))  # --><class ‘dict‘>
 4 print("abc".translate(p))  # 翻译，参数：dict -->123
 5 print("name is JankinYu".replace("n", "N"))  # 替换 -->Name is JankinYu
 6 print("name is JankinYu".count("i"))  # 字符计数 -->2
 7 print("name is JankinYu".find("n"))  # 查找，返回下标，没有则返回-1 -->2
 8 print("name is JankinYu".rfind("n"))  # 右边开始查找 -->13
 9 print("name is JankinYu".index("n"))  # 返回索引，不存在则报错 -->0
10 print("name is JankinYu".rindex("n"))  # 右边开始查找 -->13
11 """
12 输出结果：
13 <class ‘dict‘>
14 123
15 Name is JaNkiNYu
16 2
17 0
18 13
19 0
20 13
21 """

原文地址：https://www.cnblogs.com/JankinYu/p/8455490.html