TypeError: 'NoneType' object is not iterable का common कारण क्या है? इसका Python best-practice solution क्या है?

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TypeError: 'NoneType' object is not iterable का common कारण क्या है? इसका Python best-practice solution क्या है?
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4 Answers
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all lists are None

all lists are None
Additional Explanation
यह विकल्प सही समाधान नहीं है।
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Editorial Answer 1
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for loops only accept strings

for loops only accept strings
Additional Explanation
यह विकल्प सही समाधान नहीं है।
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Editorial Answer 2
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None is always iterable

None is always iterable
Additional Explanation
यह विकल्प सही समाधान नहीं है।
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Editorial Answer 3
Verified Correct Answer

A function returned None where an iterable was expected

A function returned None where an iterable was expected
Additional Explanation
Iterable की जगह None मिलने पर यह error आता है।
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Editorial Answer 4