Python Identifiers
An identifier is a name given to the entities like class, functions, variables, etc. It helps to differentiate one entity from another.
Rules for writing identifiers:
- Identifiers can be a mixture of letters in lowercase (a to z) or uppercase (A to Z) or digits (0 to 9),
or an underscore (_). Names like myData, var_1, and print_this_to_screen, are all valid examples.
- An identifier cannot begin with a digit or a numeric variable.
EXAMPLE:- 9vari is invalid, but var9 is a valid name.
- Keywords’ names cannot be used as identifiers.
- We should not use any special symbols like !, @, #, $, %, etc., in the naming of our identifier.
- An identifier can be of infinite length as such.
Practices with Identifiers in Python
- Class names always start with an uppercase letter, and all the identifiers must be started with a lowercase letter.
- Private identifiers must be written with an underscore(_).
{NOTE:- This never makes a private variable but warns the programmer from trying to access it.}
- It's better to use longer names than single characters. {Like for example:- prefer to use index=2; instead of i=2;}
- It's good to practice underscore to combine words in an identifier. {For example:- It_is_a_code.}
- While dealing with mangling, adopt leading double underscore only.
- REMEMBER:- Python is a case-sensitive programming language. So, Code and code are two various identifiers.
- For naming in python, use the camel case. {For example:- Camelcase is myVarOne and Pascal case is MyVarOne}.
Example:
<![CDATA[
num = 10
print(num)
_x = 100
print(_x)
a_b = 99
print(a_b)
]]>
OUTPUT:
