What are the Datatypes & Variables used in Python?
Variables and Datatypes are important part of python programming like other programming languages.
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Variables in Python
Variables are used to store references to the object stored in memory and are named locations . The names choosed for variables and functions are Identifiers. In python Identifiers should follow these rules:
1.All identifiers should start with letter or underscore any digit cannot be used.
my_var is valid identifier But 1digit is not valid.
2.Identifiers can contain letters, digits and underscores .
3.Identifiers can be of any length.
4.Identifier can not be a keyword .
Common Keywords in python 3 are.
| False class finally is elif if or yield assert break except | in pass as from lambda try True continue for None return | raise import else global not with while and del nonlocal def |
Data Types in Python
Python has 5 data types :
1. Numbers
This data type supports only numerical values
3 different numerical types are:
int used for integer values like 5 .
float used for floating point values like 1.5 .
complex used for complex numbers like 5+3j
2. String
Strings are contiguous series of characters delimited by single or double quotes.
Python don?t have any separate data type for characters so they are represented as a single character string.
E.g:
| >>> name = "abcd" # a string
>>> mychar = 'a' # a character |
3. List
List allows to add, delete or process elements in very simple ways. List is similar to arrays.
Syntax for list is:
| >>> l = [1, 2, 3, 4] |
4. Tuple
Tuple is similar to list but once a tuple is created, nothing can be add, not delete, replace or can't reorder elements.
Syntax for tuple is:
| >>> t1 = () |
5. Dictionary
Dictionary is used to store key value pairs. It enables quickly retrieve, add, remove, modify, values using key. Dictionary is similar to what associative array or hash on other languages.
| Find = { 'abc' : '111-222-333', 'xyz' : '444-555-666' } |
Find is a dictionary with two items.
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Python
Ayesha
Tech writer at newsandstory