Level 1 : Which of the following is not a valid python tag?

Author: SarojiniD | Tags: basic | 1859+ Python FAQs | Share
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using-else-and-finally | odd-number | function-and-scope | else-statement | while-else-loop | walking-through-directories-using-os.walk() | identity-operator | namedtuple | class-and-object | while-loop | global-variable | datatype | class-and-inheritance | encapsulation | copy | encoding | dictionary-comprehensions | virtual-environment | library | filter-function | boolean-masking | tuple | version-check | quantifiers-(*,-+,-?,-{}) | pickling--unpickling | input-function | scientific-notation | statement | class-decorators | goto-function | multiple-except-blocks | assignment-operators | thread | nested-loop | default-arguments | iterator | math-copysign | bitwise-operator | collections | arbitrary-arguments-(*args,-**kwargs) | complex-number | destructor | name-mangling | sum-function | syntax | lambda | mapping-function | working-with-temporary-files-using-tempfile | feature | while-loops | design-principle | data-structure | introduction-to-threads | operations | tuples | 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