Python syntax can be executed directly in the Command-Line or by creating a python file using the .py extension and running it in the Command-Line. In this article, we will see some important rules and syntax that we need to keep in mind while doing Python Programming.
Few things to remember while writing programs in Python
- Python is case-sensitive it means variable with name number and Number both are different.
- There is no statement terminator in python, means no semicolon; is required to terminate a statement.
Ex: print(“hello”) - If you want to write the two command in a single line then you can use a semicolon and write the two command in a single line.
Ex: print(“hello”); print(“world”)
output:
hello
world - There are some reserved words in Python, you cannot use them as a variable or constant. Check out the complete list of Python reserved keywords here.
Python Identifiers
A Python identifier is a name given to variables, functions, modules, classes, or any other objects. In Python, an identifier must starts with a letter A to Z or a to z or an underscore (_) followed by more letters or numeric values.
Naming conventions for Python identifiers
- Class names start with an uppercase letter.
- All other identifiers start with a lowercase letter.
- Private identifier starts with an underscore (_).
- If an identifier starts with Two underscores, it indicates a strongly private identifier.
Strings in Python
In Python, we can use
a.) single ” to represent a string.
ex: name=’Demo’
b.) double “” to represent the string.
ex: name=”Demo”
c.) Triple “”” “”” to represent the string.
ex: name=”””Demo”””
Comment in python
# is used to comment the line in python. Where ever # is found Python will treat rest of the line as a comment.
Example:
print ('hello world')
# print('Demo')
Indentation in Python
Indentation is the most important thing in python because python does not use the { } to write the code block. Python uses indentation to indicate a block of code. The Indentation means one tab. If you skip the Indentation, Python will throw an error.
Ex:
if(a<10):
print("hello")
else:
print("world")
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