Which of the following are valid identifiers and why/why not : Data_rec, _data, 1 data, datal, my.file, elif, switch, lambda, break ?

/ sa 11 cs chapter 6, sa 11 ip chapter 3 / By

Invalid identifiers:

1 data – The first character shouldn’t be a number

my.file – Periods are not allowed

elif, lambda and break – Keywords can’t be used as identifiers

Rest are valid identifiers