Python Syntax
Definition of Python Syntax :
It contains a set of rules which programmer has to follow while writing an instruction in a Python Programming Language.
Statement or Expression :
A statement in a Python Programming Language is a single set of instruction in which your python engine can execute.
Single Line Statement :
Whenever the programmer is writing a statement should be written in a single line.
Below is the example of syntax error. when you write two statements in a single line without following a set of rules in Python Programming Language then it will throw an syntax error.
Single Line Statement In Multiple Line :
Single line statement looks like in python is 3 + 2 – 3.
Example of Single Line : 3 + 2 – 3
Whenever you want to break the line there we will use ( \ ) character. For suppose if you do not use Backslash ( \ ) character and you try to write a single statement in a multiple lines then it will throw syntax error.
- You can see Example of single statement in multiple lines is shown in below Image without \ character in 1st code .It throws syntax error.
2. You can see the below image of 2nd code which executes and gives output as 2 . Following the python syntax rule is mandatory and here we have used \ character to break the line.
Multiple statement in a single line ( ; ) :
We can write a multiple statements in a single line by using Semi Colon ( ; ) character. Example of multiple statements in a single line in Below Image a shown.
Comments :
Get Manchirala Arun Kumar’s stories in your inbox
Join Medium for free to get updates from this writer.
It gives an explanation of particular code.
- It is a set of rules /instructions which is executed by python engine is known as statement or expression.
- A set of instruction which is ignored by python engine is called Comments.
- Comment is denoted by # in python language. Which is used at starting character of a set of instruction.
Below image is the example of comments. How python engine is ignoring the code which is commented and it is generated output as blank.
Identifiers :
It is nothing but they are the names given to an entity or object like class, functions,variables etc.
How to write a variable name (identifier):-
- Variable name should start with an alphabet or underscore ( _ ).
- Ex :- ArunKumar or _Arun_kumar
2. Variable name can have a number but this shouldn’t be at starting of alphabet.
- Ex:- Arun5kumar
3. Variable name should not contain any special characters.
- Special characters are ! @ # $ % ^ & * ( ) — = + \ | [ ] { } ; : / ? . > .Except underscore.
4. Python is case-sensitive.thus, Line is different from line.
- Box = 10 and box =10 both are different.
5. We can’t use keywords as variable-name which is already a special word in Python Programming Language.
Variable :-
- It is a container to store the data.
- Rule is ( Variable-Name Assignment-operator data)
- Example of a Rule x = 2 .( Here x is variable-name , Equal sign ( = ) is assignment operator and 2 is a Data.
- We can reuse the same data again and again.
- Variable is a memory block inside the RAM (Random Access Memory).
- It is a temporary name given to a block of memory inside a RAM.
- RAM is a temporary storage.
Keywords :
Keywords are nothing but they are reserved words in Python Programming Language .Those words have a special meaning in PPL (Python Programming Language). There are total 36 keywords are present.
