Fundamentals Of Python - Part Two

Introduction

 

In this article, we learn some fundamentals of Python, like Identifiers, Reserved words, Comments, Multiline Statement, Quotation in python, Multiple statement in single line, Suites, etc.

• Fundamentals Of Python 

Python Identifiers

 

Python Identifiers are smaller elements of a Python program. We can say that Identifiers are the name used to identify a variable, module, class, function, and other objects.

 

Rule for Identifiers

• Python Identifiers are stared with alphabet (a-z) or(A -Z) Or underscore ( _ )
• Python Identifiers are followed by any alphabet (a-z) or (A-Z) , number (0-9) and underscore(_)
• Python Identifiers does not start with digit(number (0-9)) and any special characters( @,% and $ etc.)
• Python Identifiers does not have any special characters (@,% and $ etc.)

Example

 

Identifiers name	Correct or incorrect
_name	Correct
_name1	Correct
name_	Correct
2name	Incorrect
name_lastname_1	Correct
@name	Incorrect
name@	Incorrect
Name	Correct
Name1	Correct

 

Python is case sensitive language. For example, in Python, CSHAPCORNER and csharpcorner both are different Identifiers (Shown in the picture below).

 

 

Names for Identifiers in Python

• In Python, class names should be started with an upper letter.
• Starting with an underscore means the identifier is private.

Python reserved word (key word)

 

Python keywords (reserved words) are words which is reserved by the Python and we cannot use as variables and constraints

 

Python keywords are listed below:

 

Python reserved words
False	True	from	if
None	def	global	import
And	del	raise	in
As	elif	return	is
Assert	else	try	lambda
Break	except	while	nonlocal
Class	finally	with	not
Continue	for	yield	or
Pass	Pass	Pass	Pass

 

Comments in Python

• Python also supports comments like other programming languages.
• All characters and strings after the hash (#) sign and before finishing the physical line
• Python does not support multiline comments.

Example

# this is the Python comment
print("this is c#corner python tutorial by ajay malik")
#this Python workspace

Output

 

In the above example, the comment is ignored by Python.

 

 

Line and Indentation

 

In Python, no braces exist to indicate the block of a function, class and code. It is indicated by line indentation.

 

For example:

 

 

Quotations in Python

 

Python supports single (‘), double (“) and triple (‘’’ or “””) quotes to denote a string.

 

Triple (‘’’ or “””) are used to span strings in multiple lines.

 

For example:

1. name = 'Python'
2. type = "programming language"
3. content = """Python is an open-source programming language

free to download and easy to use"""