Python Syntax

The syntax of the any programming language is the set of rules that defines how a program will be written and interpreted (by both the runtime system and by human readers).
Python syntax can be executed either using Command Line Or by creating a python file on the server, using the .py file extension and execute it in the Command Line.

Writing directly in the Command Line:

>>> print("Hello, Students!")
    Hello, Students!

By creating a python file and running it in the Command Line:
C:\Users\Your Name>python file1.py

1. Python Indentation

Indentation in Python helps to create block of code.Without proper indentation python code will not get compiled and displaying IndentationError.Where in other programming languages such as C, java use braces({}) to define a block of code,Python uses indentation.
Indentation refers to the spaces at the beginning of a code line.
Example:


if 7 > 2:
  print("seven is greater than two!")


The same number of spaces must be used in the same block of code,Otherwise Python will show error .


if 9>5:
  print("9 is greter than 5")
  print("5 is less than 9")	

The above code is correct.



if 9>5:
  print("9 is greter than 5")
     print("5 is less than 9")		

The above code is incorrect.Error will be displayed.

Example of Python Syntax

Python is a user friendly language because of its intelligent syntax structure.
Let’s do a simple Python program and you will get an idea of how programming in Python looks like.


#Simple Python Program to see whether a user is Minor or Adult.
# getting user’s name 
print("Enter your name:")
name = input()
# getting user’s age
print("Enter your age:")
age = int(input())
# condition to check whether user is Minor or Adult
if( age >= 18 ):
    print( name, ' is Adult.')
else:
    print( name, ' is Minor.')

Output

Enter your name:
Rishi
Enter your age:
19
Rishi is Adult.


Carefully, look at all print() statements given above.Could you notice that first two print()statements are enclosed in double quotes and the next two print() statements are enclosed in single quotes.
print("Enter your name:")
print("Enter your age:")
statements enclosed in double quotes

print( name, ' is Adult.')
print( name, ' is Minor.')
statements enclosed in single quotes



2. Python Multiline Statements

In Python a new line means a new statement. But sometimes, you may want to split a statement in two or more lines.
It may be to aid readability. You can do so in the following ways.

i. Use a backward slash


>>> print("Hello students\
 how are you?")

	output
	Hello students how are you?

You can also use it to distribute a statement.

>>>x\
=\
5
>>> print(x)

Output:

5	

ii. Put the String in Triple Quotes


>>> print("""Hello students
       how are you?""")	

Output:

Hello students
     how are you?	

>>> ns='''he\
ll\
o'''
>>> print(ns)	

hello	

iii. Multiple Statements in One Line

>>>x=5;print(x);	

output:
5	




3. Python Variables

Data type is not necessary to declare a variable in Python Programming language.Python variables are created by assigning values of desired type.
Example
Variables in Python:


>>>x = 5
>>>print(x)
5
>>>x="Hello, World!"
>>>print(x)
Hello, World	




4. Python Comments

Comments are used for code documentation.
Python Comments start with a #
Example
Comments in Python:


#This is a comment.
print("Hello, students!!")