101
YOUR FIRST LITTLE STEPS WITH THE PYTHON
WHAT IS PYTHON
& its features
Python is a general purpose, dynamic, high level and interpreted programming language.
Static
Datatype decides at Compile time.
Dynamic
Datatype decides at Execution time.
int a = 5;
int a
a = 5;a = 5;
Why python is Popular
-
Open Source -
Community support -
Web development (Django) -
Data science (Machine learning, AI) -
Automation -
GUI Programming -
& its F**k easy
WHERE DO, WE RUN PYTHON PROGRAMMES
-
Command prompt, Terminal
Or IDE (PyCharm, PyDev etc)
Let's GO
Open Cmd Or Terminal
HELLO, WORLD!
print "HELLO, WORLD!"hello.py
Standard Data Types
-
Numbers -
String -
List -
Tuple -
Dictionary
Python Lists
- To some extent, lists are similar to arrays in C.
- One difference between them is that all the items belonging to a list can be of different data types.
list = [ 'abcd', 786 , 2.23, 'john', 70.2 ]
tinylist = [123, 'john']
#print
print listPython Tuples
-
Read-only
tuple = ( 'abcd', 786 , 2.23, 'john', 70.2 )
tinytuple = (123, 'OM')
tuple = ( 'abcd', 786 , 2.23, 'OM', 70.2 )
list = [ 'abcd', 786 , 2.23, 'OM', 70.2 ]
tuple[2] = 1000 # Invalid syntax with tuple
list[2] = 1000 # Valid syntax with listPython Dictionary
# empty dictionary
my_dict = {}
# dictionary with integer keys
my_dict = {1: 'apple', 2: 'ball'}
# dictionary with mixed keys
my_dict = {'name': 'John', 1: [2, 4, 3]}
# using dict()
my_dict = dict({1:'apple', 2:'ball'})
# from sequence having each item as a pair
my_dict = dict([(1,'apple'), (2,'ball')])-
Creating a dictionary is as simple as placing items inside curly braces {} separated by the comma.
-
An item has a key and the corresponding value expressed as a pair, key: value.
Console Input
#only for strings
username = raw_input('What is your name? ')
#all types except string
myage = input("What is your age? ")
-
Two types - input() and raw_input()
Functions
-
Defining a function -
Passing arguments -
Returning from a function -
Calling a function
-
Defining a function
def function_name():
print("fuck our funtion is working")
-
Passing Arguments
function_name(4,6)
-
Returning from a function
def fun(a, b):
sum=a+b
return sum
#OR
def fun(a, b):
return a + b
-
Calling Statement
def fun(a, b):
return a + b
x=fun(3, 6)
#x holds value returned by function Classes and Objects
Creating a Class
class class_name:
something="lol"
Instance objects
instance = class_name()
instance.something
dir()
Try this
PYTHON 101
By omkar yadav
PYTHON 101
Python 101
