Which of the following is an invalid variable?_1st_stringmy_string_1foo
Question
Which of the following is an invalid variable?_1st_stringmy_string_1foo
Solution
The invalid variable is "_1st_string". In Python, variable names cannot start with a number. They must start with a letter or an underscore. Therefore, "my_string_1" and "foo" are valid variable names, but "_1st_string" is not.
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