Determine if variable is defined in Python -

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संभव डुप्लिकेट:

आप कैसे जानते हैं कि एक चर एक रनटाइम पर कोड में किसी विशेष स्थान पर सेट किया गया है? यह हमेशा स्पष्ट नहीं होता है क्योंकि (1) वैरिएबल को सशर्त सेट किया जा सकता है, और (2) वेरिएबल को सशर्त रूप से हटाया जा सकता है। मैं PHP या परिभाषित? रूबी में परिभाषित () जैसे कुछ के लिए देख रहा / रही हूं / isset () में Pre> यदि कंडीशन: a = 42 # है "a" यहां परिभाषित है? यदि अन्य कंडिशन: डेल ए # है तो "ए" यहां परिभाषित है? 

  प्रयास करें: nameError को छोड़कर thevariable: प्रिंट "ठीक है, यह नहीं था सभी के बाद परिभाषित! " Else: प्रिंट "निश्चित है, यह परिभाषित किया गया था।"

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