[开发测试]【格式化方法】python&字符串

常用字符串

# 1.capitalize -> 首字符改成大写
# s = "jack"
# result = s.capitalize()
# print(result)

# 2.casefold -> 字符串之前对比，都改成一样的
# s = 'Jack'
# s2= 'jack'
# ret = s.casefold() == s2
# print(ret)

# 3.center -> 字符串两边填充
# a="jack"
# ret = a.center(50,'-')
# print(ret)

# 4.expandtabs -> 可以看作为键盘上的tab键
# s = "jack   boy"
# ret = s.expandtabs(20)
# print(ret)

# 5.ljust -> 字符串左边填充  && rjust -> 字符串右边填充
# s = "jack"
# ret = s.rjust(20,'-')
# print(ret)

# 6.lower -> 全变小写 && upper ->全变大写
# s = "hello world"
# ret = s.upper()
# print(ret)

# 7.swapcase -> 大小写互换
# a = "jACK"
# ret = a.swapcase()
# print(ret)

# 8.title -> 改成标题，即每个单词首字母大写
# s = "jack"
# ret = s.title()
# print(ret)

# 9.zfill -> 字符串空的地方填0
# s="Jack"
# ret = s.zfill(20)
# print(ret)

# 10.strip() -> 去掉两边的空格地方 && rstrip() -> 去掉右边 && lstrip() -> 去掉左边
# s = "  jack   "
# ret = s.strip()
# print(ret)

# 11.format() -> 引用外部变量
# msg = "my name is {name}, i am {age} years old. "
# result = msg.format(name="JackMa",age=56)
#
# print(result)

字符串判断

# 1.startswith -> 判断首写字母 && endswith -> 判断尾部字母
# a = "Jack"
# s = a.startswith('J')
# print(s)

# 2.isalnum -> 是不是字母or数字 isalpha -> 是不是字母
# s = "jack123"
# ret = s.isalnum()
# print(ret)

# 3.isidentifier -> 是不是合法的可能做变量的名字
# s = "1boy"
# ret = s.isidentifier()
# print(ret)

# 4.isnumeric -> 是不是数字 && 跟isdigit有些差异
# age="二十五"
# ret = age.isnumeric()
# print(ret)

# 5.isspace -> 是不是空格 && isprintable -> 是否可打印
# ret = ' '.isspace()
# print(ret)

# istitle -> 判断首字母是不是大写 && isupper -> 判断字母是不是大写
# s = "Hello"
# ret = s.istitle()
# print(ret)