Python Syntax
Python syntax are the rules which every python programmer has to follow while writing the instruction.
If you don’t follow the instructions, it will get an error,that error is called syntax error.
Statement
Statement is a instruction which our python engine can execute.
Types of statements in python
- Single statement in single line
One statement in one line
Example
2. Multiple statements in single line
We can write multiple statements in single line by using the symbol semicolon ;
Example: Without using semicolon
Example: With using semicolon
3. Single statement in multiple lines
We can write single statement in multiple lines by using the symbol backslash(\) or parentheses(()).
Example: Whenever you want to break the statement then use backslash
Example: Using parentheses
What is comment
Comment is a instruction will be ignored by python engine.
Whenever, we are writing any instruction in python programming language always python think entire instruction is statement.
Use the symbol # hash to write the comment.
What is keywords
Keywords are reserved words that have special meanings in python.
Example: if,else,for etc
Variables in python
What is variable?
A variable is a container used to store data in python .
What is data?
Data is a collection of information.
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What is a variable name?
A variable name is the name given to a variable.I helps us to identify the data stored .
When do we use variables?
We use variables whenever we want to store and reuse data again and again.
Variable = data(= is assignment symbol)
Example
x is a variable name
= is a assignment symbol
10 is a data value
Naming convention in python
What is naming convention?
Naming convention is a set of python rules follows and create a variable name.
Rules of naming convention
- A Variable name should always start with alphabets or an underscore(_).
Examples: Variable starting with alphabet or underscore ,so it is valid.
Variable is not starting with alphabet or underscore,it starting with number so the output is error that error is called syntax error.
2. Variable name should not contain any special symbols or characters except underscore.
Example:Variable is not containing any special symbol (except _)
3. Variable name can contain numbers( not as the first character)
Example: Variable not containing with a number as a first character.
Variable containing first character as a number so the output is syntax error.
4. Python is a case sensitive language.
Python treats uppercase and lowercase letters as different characters.
Example
5. Never use keywords as a variable name.
Keywords are reserved words in python. They have a special meanings, so we cannot use them as a variable name.
