python - Why does the istitle() string method return false if the string is clearly in title-case? -

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Return to true, if the string title is a categorized string and has at least one letter, for example uppercase letters can only obey untold characters and lowercase letters. Otherwise return false.

But in this case it returns false: 

  gt; & Gt; Book = 'every programmer should know' & gt; & Gt; & Gt; Book.title () 'Every Programmer Should Know' & gt; & Gt; & Gt; Book.istitle () Wrong

What am I missing?

The title of the method () is not to change the string (telegram is irreversible in Python) This is a new string That you have to assign to your variable: 

  & gt; & Gt; & Gt; Book = 'every programmer should know' & gt; & Gt; & Gt; Book = book.title () & gt; & Gt; & Gt; Book.istitle () is true

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