Python Keywords and Identifiers

Python Keywords

Python keywords are the python reserved words reserved by python language secured to define the python syntax and structure of the python language. We cannot use these reserved keywords as variable names, function names, class names, or other identifiers. In python, all the keywords are case-sensitive. All the python keywords should contain lowercase letters only except True, False, and None must be written as they are.

The following list shows the keywords in python.

Keyword	Description
True	This keyword represents the Boolean Value ‘true.’
False	This keyword represents the Boolean Value ‘false.’
None	This keyword represents the Null Value
and	This is a logical operator
as	This keyword used for creating an alias
assert	The assert keyword is used to insert debugging assertions in the program.
async	This keyword is always used in the coroutine function body.
await	This keyword is used for asynchronous processing.
break	This keyword is used to break the loop.
class	This keyword is used to define a class.
continue	This keyword is used to take the control back to the loop.
def	This keyword is used to define a function.
del	This keyword is used to delete objects like variables, lists, or any other kind of object.
Elif	This keyword is used for a conditional statement along with an if statement.
else	This keyword is also used as a conditional statement, the same as above.
except	This keyword is used for exceptional handling in Python.
finally	This keyword is used for exceptional handling, but finally, the block will always get executed.
for	This keyword is used as a looping statement used to iterate over the elements of a sequence.
from	This keyword is used to import a function in python.
global	This keyword is used to declare global variables.
if	This keyword is used to declare a condition in Python.
import	This keyword is used for importing the module in python.
in	This keyword is used to check specific values are present in an iterable object.
is	This keyword is used to test object identity
lambda	This keyword is used to make anonymous functions.
nonlocal	This keyword is used to access the variables defined outside of the scope in the block.
not	This keyword is used to negates a Boolean value.
or	This keyword is used for a conditional statement where at least one condition must be fulfilled.
pass	This keyword is used to tell the program or a function to do nothing.
raise	This keyword is used to create a user define exception.
return	This keyword is used to return a value at the time function is exited
try	This keyword is used to specifies the exception handlers.
while	This keyword is used to run a block of statements till the expression is fulfilled
with	This keyword is used to open a file.
yield	This keyword is a replacement for a return keyword.

At first, this keyword will look very difficult to understand but believe me, all the keywords will make sense once we continue with our python tutorial, and if your want to learn in-depth about keywords with examples, you can see this (Link to another page for keywords in details)

To see the latest list of python keywords, we can follow the following steps.

Step 1: Open Python IDLE or Python Interpreter

Step 2: type the help() command to access the help shell.
Step 3: type keywords on the help shell, and you will get the following result.

Python Identifiers

What are identifiers in python?

The identifiers in python are a name used to identify a variable, function, class, module, or other objects. An identifier follows specific python rules that can combine an uppercase letter from A - Z or a lowercase a - z. It can also start with an underscore(_) followed by any number from 0 - 9 or letter.
Example a_data, a1, This_is_variable, and v_3 all are valid identifiers.

An identifier like 1name is invalid, and it cannot start with a digit. Also, keywords cannot be used as identifiers.

Python identifiers examples

Lets us see some examples of valid and invalid identifiers in python

Below are the list of valid python identifiers.

• abc123
• abc_de
• _abc
• ABC
• abc

Below is the examples of invalid identifiers in python.

• 123abc
• abc@
• 123
• for

FAQ

Question: Are python variable case sensitive?
Answers: Yes, the Python variable is case sensitive; both “Python” and “python” are different in a python programming language.

Question:Is python case sensitive when dealing with identifiers?
Answers:Yes, Python is case-sensitive when we are dealing with identifiers.