Which of the following option is correct for python?
a. Variable name can start with a digit
b. Variable name can start with underscore
c. Keywords can be used as variable names
d. Variable names can have symbols like @, #, etc. no
Answers
Explanation:
Keywords are the reserved words in Python.
We cannot use a keyword as a variable name, function name or any other identifier. They are used to define the syntax and structure of the Python language.
In Python, keywords are case sensitive.
There are 33 keywords in Python 3.7. This number can vary slightly over the course of time.
All the keywords except True, False and None are in lowercase and they must be written as they are. The list of all the keywords is given below.
False await else import pass
None break except in raise
True class finally is return
and continue for lambda try
as def from nonlocal while
assert del global not with
async elif if or yield
Looking at all the keywords at once and trying to figure out what they mean might be overwhelming.
If you want to have an overview, here is the complete list of all the keywords with examples.
Python Identifiers
An identifier is a name given to entities like class, functions, variables, etc. It helps to differentiate one entity from another.
Rules for writing identifiers
Identifiers can be a combination of letters in lowercase (a to z) or uppercase (A to Z) or digits (0 to 9) or an underscore _. Names like myClass, var_1 and print_this_to_screen, all are valid example.
An identifier cannot start with a digit. 1variable is invalid, but variable1 is a valid name.
Keywords cannot be used as identifiers.
global = 1
Output
File "<interactive input>", line 1
global = 1
^
SyntaxError: invalid syntax
We cannot use special symbols like !, @, #, $, % etc. in our identifier.
a@ = 0
Output
File "<interactive input>", line 1
a@ = 0
^
SyntaxError: invalid syntax
An identifier can be of any lengt
Answer:
Explanation:
Python definition:
Python is a popular computer programming language used to create software and websites, automate processes, and analyse data. Since Python is a general-purpose language, it may be used to develop a wide range of programs and isn't tailored for any particular issues.
Python Terms:
The reserved words in Python are called keywords.
A keyword cannot be used as a variable name, function name, or for any other type of identification. They are used to specify the Python language's syntax and organization.
Key words in Python are case-sensitive.
In Python , 33 keywords are available. Over time, this figure can change a little.
Identifiers in Python:
A name provided to an entity, such as a class, function, variable, etc., is called an identifier. It aids in separating one thing from another.
Writing guidelines for identifiers:
A combination of lowercase (a to z) or uppercase (A to Z) characters, numerals (0 to 9), or the underscore (_) can be used as an identifier. Examples of acceptable names include my Class, var 1, and print this to screen.
- A digit cannot begin an identification. Variable1 is an acceptable name, however 1variable is not.
- Identifying terms cannot be used as keywords.
- Special symbols like!, @, #, $, percent, etc. cannot be used in our identifier.
- Any length can be used for an identifier.
Variable names can start with a letter or an underscore but not with a number. Option D is right, thus.
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