模塊是指將相關的功能和數據封裝在一起的一個單元。在編程中，模塊可以用來組織代碼，提高代碼的可讀性和可維護性。一個模塊可以包含函數、類、變量、常量等。 使用模塊的好處： 1. 提高代碼的復用性：可以將一些常用的功能封裝在模塊中，需要時直接引用即可。 2. 提高代碼的可維護性：將相關的功能和數據歸類到不同的模塊中，便于管理和維護。 3. 提高代碼的可讀性：通過模塊化的設計，代碼結構更加清晰，易于理解和閱讀。 在Python中，一個模塊可以是一個.py文件，文件名即為模塊名。可以使用import關鍵字來引入一個模塊，然后就可以使用該模塊中定義的函數、類、變量等。 例如，有一個名為math的模塊，可以使用以下方式引入并使用該模塊中的函數： ``` import math result = math.sqrt(16) print(result) # 輸出4.0 ``` 除了使用import關鍵字引入整個模塊之外，還可以使用from...import...語句來引入模塊中的具體函數、類、變量等。 例如，只需要使用math模塊中的sqrt函數，可以使用以下方式引入并使用： ``` from math import sqrt result = sqrt(16) print(result) # 輸出4.0 ``` 使用模塊可以提高代碼的效率和可維護性，是編程中常用的技術之一。
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