python – 如果字符串显然是title-case,为什么istitle()字符串方

发布时间：2020-12-20 12:39:37 所属栏目：Python 来源：网络整理

导读：在istitle()字符串方法中,Python 2.6.5手册中包含： Return true if the string is a titlecased string and there is at least one character,for example uppercase characters may only follow uncased characters and lowercase characters only cased o

在istitle()字符串方法中,Python 2.6.5手册中包含：

Return true if the string is a titlecased string and there is at least one character,for example uppercase characters may only follow uncased characters and lowercase characters only cased ones. Return false otherwise.

但在这种情况下,它返回false：

>>> book = 'what every programmer must know'
>>> book.title()
'What Every Programmer Must Know'
>>> book.istitle()
False

我错过了什么？

解决方法

方法title()不会改变字符串(字符串在Python中是不可变的).它会创建一个必须分配给变量的新字符串：

>>> book = 'what every programmer must know'
>>> book = book.title()
>>> book.istitle()
True

（编辑：李大同）

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