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                合規國際互聯網加速 OSASE為企業客戶提供高速穩定SD-WAN國際加速解決方案。 廣告
                有時簡單的生成器可以用簡潔的方式調用,就像不帶中括號的鏈表推導式。這些表達式是為函數調用生成器而設計的。生成器表達式比完整的生成器定義更簡潔,但是沒有那么多變,而且通常比等價的鏈表推導式更容易記。 例如: ~~~ >>> sum(i*i for i in range(10)) # sum of squares 285 >>> xvec = [10, 20, 30] >>> yvec = [7, 5, 3] >>> sum(x*y for x,y in zip(xvec, yvec)) # dot product 260 >>> from math import pi, sin >>> sine_table = {x: sin(x*pi/180) for x in range(0, 91)} >>> unique_words = set(word for line in page for word in line.split()) >>> valedictorian = max((student.gpa, student.name) for student in graduates) >>> data = 'golf' >>> list(data[i] for i in range(len(data)-1, -1, -1)) ['f', 'l', 'o', 'g'] ~~~ Footnotes | [[1]](http://www.pythondoc.com/pythontutorial3/classes.html#id3) | 有一個例外。模塊對象有一個隱秘的只讀對象,名為?__dict__?,它返回用于實現模塊命名空間的字典,命名?__dict__?是一個屬性而非全局命名。顯然,使用它違反了命名空間實現的抽象原則,應該被嚴格限制于調試中。 |
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