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              Python面試題測驗,看看你入門了嗎?

              Python在設計上堅持了清晰劃一的風格,這使得Python成為一門易讀、易維護,并且被大量用戶所歡迎的、用途廣泛的語言。設計者開發時總的指導思想是,對于一個特定的問題,只要有一種最好的方法來解決就好了。

              最近覺得 Python 太“簡單了”,于是在老司機面前放肆了一把:“我覺得 Python 是世界上最簡單的語言!”。于是老司機給我了一份滿分 100 分的6道題,下面是題目的錯誤實錄:

              1.你恐怕不會留意的列表生成器


              檢查一下下面的代碼會報錯的原因,并說出來?

              Python面試題測驗,看看你入門了嗎?

              列表生成器的正解答案如下:

              Python面試題測驗,看看你入門了嗎?

              Python面試題測驗,看看你入門了嗎?

              或者答案可以是這樣

              Python面試題測驗,看看你入門了嗎?

              此內容的再補充

              Python面試題測驗,看看你入門了嗎?

              Python面試題測驗,看看你入門了嗎?

              2.據說是最難的裝飾器


              描述:按照實際情況來寫一個類裝飾器用來度量函數/方法運行時間,你看怎么實現?

              Python面試題測驗,看看你入門了嗎?

              此類裝飾器能夠運行在普通函數上:

              Python面試題測驗,看看你入門了嗎?

              此類裝飾器運行在方法上會報錯,為什么?

              Python面試題測驗,看看你入門了嗎?

              如果堅持使用類裝飾器,應該如何修改?

              此問題的答案是

              Python面試題測驗,看看你入門了嗎?

              Python面試題測驗,看看你入門了嗎?

              3.Python 調用機制看你會不會


              描述:Python開發者們知道?__call__?方法可以用來重載圓括號調用,其實問題根本不是這個。

              Python面試題測驗,看看你入門了嗎?

              現在大家可以看到?a()?似乎等價于?a.__call__()?,好的,現在我們寫出了如下的代碼

              Python面試題測驗,看看你入門了嗎?

              Python面試題測驗,看看你入門了嗎?

              Python面試題測驗,看看你入門了嗎?

              Python面試題測驗,看看你入門了嗎?

              4.描述符你會犯錯嗎?


              描述:如果要寫一個 Exam 類,其屬性 math 為 [0,100] 的整數,若賦值時不在此范圍內則拋出異常,你是否決定用描述符來實現這個需求。

              Python面試題測驗,看看你入門了嗎?

              看起來一切正常。不過嘗試說明是什么問題,改寫 Grade 描述符試一下:

              Python面試題測驗,看看你入門了嗎?

              不過這樣會導致更大的問題,請問該怎么解決這個問題?

              答案

              Python面試題測驗,看看你入門了嗎?

              兩種方法

              第一種:

              Python面試題測驗,看看你入門了嗎?

              Python面試題測驗,看看你入門了嗎?

              Python面試題測驗,看看你入門了嗎?

              5.Python 繼承機制的坑


              描述

              試求出以下代碼的輸出結果。

              Python面試題測驗,看看你入門了嗎?

              答案:輸出是 36 ,具體可以參考?New-style Classes?,?multiple-inheritance

              6. Python 特殊方法的使用模式


              描述:寫了一個通過重載?new?方法來實現單例模式的類。

              Python面試題測驗,看看你入門了嗎?

              現在有一堆類要實現為單例模式,打算照著寫一個元類,這樣可以讓代碼復用:

              Python面試題測驗,看看你入門了嗎?

              報錯啊,下面這段代碼能夠捕獲一切屬性調用并打印參數

              Python面試題測驗,看看你入門了嗎?

              試解釋為什么給?getattribute?打補丁成功,而?new?打補丁失敗。
              如果堅持使用元類給?new?打補丁來實現單例模式,應該怎么修改?

              答案

              其實這是最氣人的一點,類里的?__new__?是一個?staticmethod?因此替換的時候必須以?staticmethod?進行替換。答案如下:

              Python面試題測驗,看看你入門了嗎?

              結語


              Python這門語言還是博大精深的,如果你現在剛剛學不久就以為很好了,小心這里面其實有很多坑。

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