python之字符串详解2

逻辑判断字符串类型，返回布尔值

1. islower

描述：判断所有字符是否为小写

语法：

    def islower(self): # real signature unknown; restored from __doc__

        """

        S.islower() -> bool

        Return True if all cased characters in S are lowercase and there is

        at least one cased character in S, False otherwise.

        """

        return False

样例：

name='allen'

result=name.islower()    #判断字符都为小写

print(result)

True    #显示结果

2. isupper

描述：判断所有字符是否为大写

语法：

    def isupper(self): # real signature unknown; restored from __doc__

        """

        S.isupper() -> bool

        Return True if all cased characters in S are uppercase and there is

        at least one cased character in S, False otherwise.

        """

        return False

样例：

name='allen'

result=name.isupper()    #判断所有字符为大写

print(result)

False    #显示结果

3. istitle

描述：判断是否为title类型，即第一个字符为大写，其他为小写

语法：

    def istitle(self): # real signature unknown; restored from __doc__

        """

        S.istitle() -> bool

        Return True if S is a titlecased string and there is at least one

        character in S, i.e. upper- and titlecase characters may only

        follow uncased characters and lowercase characters only cased ones.

        Return False otherwise.

        """

        return False

样例：

name='Allen'

result=name.istitle()    #判断是否为title类型的字符串

print(result)

True    #显示结果

4. isalpha

描述：判断所有字符是否为字母

语法：

  def isalnum(self): # real signature unknown; restored from __doc__

        """

        S.isalnum() -> bool

        Return True if all characters in S are alphanumeric

        and there is at least one character in S, False otherwise.

        """

        return False

样例：

name = 'allen'

result=name.isalpha()    #判断所有字符为字母

print(result)

True    #显示结果

isalpha

5. isdigit

描述：判断所有字符是否为数字

语法：

    def isdigit(self): # real signature unknown; restored from __doc__

        """

        S.isdigit() -> bool

        Return True if all characters in S are digits

        and there is at least one character in S, False otherwise.

        """

        return False

样例：

name = ''

result=name.isdigit()    #判断所有字符为数字

print(result)

True    #显示结果

name = '123abc'

result=name.isdigit()    #判断所有字符为数字

print(result)

False   #显示结果

isdigit

6. isdecimal

描述：判断所有字符是否是十进制数

语法：

    def isdecimal(self): # real signature unknown; restored from __doc__

        """

        S.isdecimal() -> bool

        Return True if there are only decimal characters in S,

        False otherwise.

        """

        return False

样例：

name = ''

result=name.isdecimal()    #判断所有字符是否是十进制

print(result)

True    #显示结果

name = '123abc'

result=name.isdecimal()    #判断所有字符是否是十进制

print(result)

False    #显示结果

decimal

巴特西

python之字符串详解2

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