namespaces - What's the python __all__ module level variable for? -


इस सवाल का पहले से ही एक उत्तर है: < / P>

  • 8 जवाब

मैंने इसे देखा है अजगर / लिब स्रोत कोड में बहुत कुछ है लेकिन मुझे नहीं पता कि यह किस लिए है।

मैंने सोचा था कि इसका इस्तेमाल मॉड्यूल के पहुंच वाले सदस्यों को सीमित करने के लिए किया गया था। इसलिए __ सभी __ पर मौजूद तत्व तब दिखाएंगे जब डीआईआर (मॉड्यूल) ।

मैंने थोड़ा उदाहरण दिया और देखा कि यह काम नहीं कर रहा था जैसा कि मैंने उम्मीद की थी ।

तो ... अजगर __ सभी __ मॉड्यूल स्तर चर के लिए क्या है?

इसके दो उद्देश्यों हैं:

  1. स्रोत को पढ़ने वाला कोई भी व्यक्ति पता चलेगा कि सार्वजनिक एपीआई क्या है

  2. जब से का उपयोग करते हुए मॉड से आयात * , केवल __ सभी __ में सूचीबद्ध नाम आयात किए जाएंगे। यह मेरी राय में महत्वपूर्ण नहीं है, क्योंकि सभी चीजों को आयात करना एक वास्तव में बुरा विचार है।


Comments

Post a Comment

Popular posts from this blog

.net - C# List<T>.Find(x=>x.Rectangle.Contains(Point)) FAIL -

For my life, I can not understand why this code generates the following output ... I think there is a bug or something while using the list and lambda, if type one rectangle exposes the property and you use the included method of rectangle object ... and the clear statement proves true while Find list method fails .... Onway Code Public Gridskeyr Warldtokapadsb (Point location) {location = _Map.WorldToClient (location); Gridsquare gs = this.find (x => x.Rectangle.Contains (location)); GridSquare KP = G.Find (X => X. laxative canteen (location)); & Lt; GridSquare & gt; List = kp.FindAll (x => x.Rectangle.Contains (location)); U.dp (list.Count); Gridskare sub = KP.Fid (X => X. laxative canteen (location)); If (sub == faucet) {u.dp (place to look for "location"); U.dp ("The location found in the grid category" + GS toaster ()); U.dp ("Grid Square Bounds" + gs.Rectangle.ToString ()); U.dp ("location found in keypad" +...
Read more

iphone - Smoothing a rounded stroke in Core Graphics -

I am making my own UITableViewCells with a gradient background. I have worked all the logic and drawing, but the one that I want to fix is ​​"chunky" around the corners of my custom cell: If you have corners, you See what I'm talking about. Here is the code that I am using to generate cells: CGCTXT C = UigRxGroupCertexConnect (); CGColorSpaceRef myColorSpace = CGColorSpaceCreateDeviceRGB (); CGGradientRef myGradient = Zero; CGFloat component [8] = TABLE_CELL_BACKGROUND; CGContextSetStrokeColorWithColor (C, [[UAColor colorWithWhite: 0.7 alpha: 1] CGColor]); CGContextSetLineWidth (C, 2); CGContextSetAllowsAntialiasing (C, Yes); CGContextSetShouldAntialias (C, Yes); CGFloat minx = CGRectGetMinX (RECT), MIDX = CGRactgetMIDX (RECT), MAX x = CGTXxX (RECT); CGFloat miny = CGRectGetMinY (Rect), maxy = CGRectGetMaxY (rect); CGMutablePathRef Path = CGPathCreateMutable (); CGPathMoveToPoint (path, NULL, minx, miny); CGPathAddArcToPoint (default margin of path, NULL, mix, ...
Read more

c++ - QtQuick: QQmlApplicationEngine failed to load component qrc:/main.qml:23 Invalid attached object assignment -

Looking at my thoughts below, am I barking the wrong tree? Or in the information given below, am I misusing the Qt API to get an error in the title? I'm trying to modify the sample to work with the default coefficic project generated from Qt Creator 3.3.0 (OpenSource). Qt 5.4.0 (GCC 4.6.1, 64bit) Based on. The first thing to look at after the code is that I stand by: The sample uses the main.cpp: qmlRegisterType & lt ; Squircle & gt; ("OpenGLUARMM", 1, 0, "Squircle"); QQuickView view; View.setResizeMode (QQuickView :: SizeRootObjectToView); View.setSource (QUrl ("QRC: ///scenegraph/openglunderqml/main.qml")); View.show (); Some name changes in my name. CPP qmlRegisterType & lt; Menuscreen & gt; ("OpenGLUnderQML", 1, 0, "Main Screen"); QQmlApplicationEngine engine; Engine.load (QUrl (QStringLiteral ("QRC: /main.qml"))); I'm not sure that the difference in using QQmlApplicationEngine...
Read more