Q. What is the correct syntax to check if a key exists in a dictionary?

यह जांचने के लिए सही वाक्यविन्यास क्या है कि शब्दकोश में कोई कुंजी मौजूद है या नहीं?

if key in dict:

if dict.has_key(key):

if key in dict.keys():

if dict.contains(key):

Explanation will be available soon. Please stay tuned.

व्याख्या जल्द ही उपलब्ध होगी। कृपया बने रहें।

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