Level 9 : Which one is not a correct variable name?

Author: VenuEmmela | Tags: variable | 1859+ Python FAQs | Share
class-and-object | design-principle | data-structure | oops | directory-operations | compute | dictionary | min-max-function | zfill-function | benefit | set | conversion | syntax-error | collections | built-in | global-keyword | built-in-modules | functions | formal-and-actual-parameter | reading:-read(),-readline(),-readlines() | sys-module | list,-set,-and-dictionary-comprehensions | slicing | choice | list-comprehension | string-formatting | list-methods-and-slicing | error-handling | function | indentation | literal-characters-and-special-characters | generator | data_structure | fabs-function | comprehension | exception | software-design | membership-operators-(in,-not-in) | sum() | generators | class-and-instance-variable | indexing | recursion | data-structure | loops | split | memory-management | aggregating-data-with-functools.reduce() | stack | installation | scientific-notation | list-vs-tuple | file | loop-control-statements | mapping-function | assert | strings | complex-number | heap-memory | error | working-with-file-paths | assignment-operator | file-handling | logical-operators | function-argument | boolean-masking | multithreading | list-mutation | loop | async | methods | multiple-inheritance | max-min | introduction-to-python | type-conversion | array | matplotlib | shallow-copy | thread | sets | default-arguments | dataframe-and-series-objects | functional-programming | immutability | data-type | descriptors | string-methods | using-the-threading-module | __future__ | mathematical-function | return-statement | head-and-tail | while-loop | test-discovery | anchors-(^,-$) | context-manager | list-operation | exception-handling | binary-operation | control-flow | boolean | writing:-write(),-writelines() | error-handling | keyword | loop-control | magic-method | identity-operators-(is,-is-not) | attribute | round-function | class-decorators | turtle | module | logical-operator | lambdas | thread-synchronization | bitwise-operator | access-modifier | binary | list-indexing | implementation | name-mangling | thread-safe-data-structures-(queue.queue) | conditional-statements | docstring | working-with-binary-files-(rb,-wb) | managing-directories-with-os-and-shutil | inherit | class-and-inheritance | math | string-formatting | list-slicing | data-structures-in-python | using-else-and-finally | list-method | using-assertions-(assertequal,-assertraises) | int | working-with-dates-and-times | identifier | creating-custom-modules | tuples | static-method | staticmethod | threading | lambda | zip-function | formatting-with-strftime | datetime | single-inheritance | constructor | data-type-conversions | command-line-parsing | tuple-methods | escape-operator | else | expression | invalid-list | bitwise-operator | defining-functions | using-join()-and-is_alive()-methods | syntax | global-variable | type_conversion | yield | string-iteration | advanced-file-operations | round | sorted | input-function | dicts | __all__-attribute | higher-order-function | working-with-temporary-files-using-tempfile | virtual-environment | multiple-except-blocks | version | syntaxerror | sorting-and-ranking | introduction-to-threads | filter-function | string-method | sorting | list | goto-function | using-yield-in-functions | data-types | iterable | factorial-function | precedence | file_handling | while-else-loop | using-map()-for-transformations | boolean-and-non-boolean | recurssion | data-structures | operators | mysql | destructor | pseudocode | pickling--unpickling | set-operation | statement | asyncio | with-statement | else-statement | operator | encapsulation | built-in-function | comparison | zip | matrix-list-comprehension | append | gil | operations | integer | time-series-with-pandas | random-function | regular-expressions | condition | conditional-statement | default-mutable-argument | matrix | center | lists | id-function | control-statement | memory | init | control-flow | data-type | functional-programming | iterators | encoding | counter | regex | typeerror | frozenset | walking-through-directories-using-os.walk() | debugging | map-function | floats | arbitrary-arguments-(*args,-**kwargs) | version-check | application | method | polymorphism | string-slicing | datetime.date,-datetime.time,-datetime.datetime | booleans | collection | unit-testing | bitwise | assignment-operators | lambda-functions | feature | asyncio-module | list-join | math-copysign | swapping | update | __init_subclass__ | identity-operator | indexing:-loc-vs-iloc | input-function | interpreter | enumerate() | class | method-overloading | string-slicing | lambda-function | inheritance | mutable | virtual-environment | intering | reading-and-writing-files | handling-missing-values-(fillna,-dropna) | using-os-and-pathlib-modules | floating-point-precision | decorator | sys | arithmetic-expression | python-history | string | identity-operator | difference-between-threads-and-processes | why-use-multiprocessing-over-threading?-(gil) | creating-and-starting-threads | tuple-unpacking | regular-expression | iterator | string-manipulation | def | filter | global-variable | type-conversion | reading-and-writing-large-files-efficiently | logical-operator | rollback | classes | arithmetic-operation | immutable-data-type | datatype | list-comprehension | slice | basic | complex | expand-tab | function-and-scope | min-function | syntax-error | range | while-loops | conditional-statement | exponentiation | counter-function | overriding-methods | comment | list-comprehensions | string-concatenation | touples | global | decimal | library | using-lists-as-stacks | filtering-and-indexing | deep-copy | file-handling | dictionary-comprehensions | type-conversion-and-casting | call | for | sum-function | objects | namedtuple | exception-handling | while-and-for-loop | string-method | format | variable | dictionaries | dictionary-methods | key-value-pairs | introduction-to-multiprocessing | joining-and-merging-dataframes | built-in-function | tuple | import-method | multiprocessing | mathematics | print | oop | match | parsing-with-strptime | multiple-inheritance | copy | logical-operation | python_version | opening-files-(open()) | operator-and | input | precedence-and-associativity | join | integers | quantifiers-(*,-+,-?,-{}) | python-syntax-and-structure | operator-or | object-attribute | python-repl | raise | operand | postfix | numpy | python-django | random | package-management | numeric | odd-number | pep | python-operators | pass | python | nested-loop | python-module | operator-overloading | print-statement | namespace | overflow | pandas | raise-statement | parameter | generators-in-python ...