Learning Python -Day 1

Day 1

Python 3 uses 3 tools to execute: IDLE, Pycharm and Notebook. These are opensource tools and can be downloaded from the internet.

Small Pyhton example in IDLE. Use fn+F5 to run the program

print (“Hello”)

Hello

Another example

a=5

b=10

c=a+b

print©

15

Another example

a=5

b=10

c=a+b

print(“sum of”,a,”and”,b,”is”,c)

sum of 5 and 10 is 15

so in the above example, we notice that variable is not in quotes.

String is in Double quotes “ ”

To coordinate we use comma ,

Any number without decimal value is integer (INT)

Any number with decimal value is Float

String can be written in single, double or triple quotes  ‘  ‘         “  “         ‘’’   ‘’’

Boolean= true or false

To find out what type of value  is either INT or float we use type() command

Example

a=5

b=10

c=a+b

print(c)

print(c,type(c))

15 <class 'int'>

To check the address of the value in memory we use id() command

print(Id(a))

1815438496

For multi-line comment use ‘’’    ‘’’

If you have single quote in the string you can use only double quotes within the string and vice versa

print( ‘hello,”this is abhishek”laptop’)

Helllo,”this is abhisheks”laptop

You can use same single quote within the sting too but for that you need to use \’

print('Helllo,this is abhishek\'s laptop')

Helllo,this is abhishek's laptop

Now we will use pycharm tool. To run the function we need CTL+shift+fn+F10. Create a new project and start working.

There are 7 types of operators in Python:

1)      Arithmetic Operator

2)      Relational Operator

3)      Logical Operator

4)      Bitwise Operator

5)      Assignment Operator

6)      Identical Operator

7)      Membership Operator

Arithmetic Operator

Key functions are:

+

-

X

/ (division)

%

//(flow division)

Xx( (exponential)

Example

a=19
b=4
c=a+b
d=a-b
e=a*b
f=a/b
g=a%b
h=a//b
i=2**4
print(c,d,e,f,g,h,i)

The output is

23 15 76 4.75 3 4 16

So we see the output c=a+b=23  d=a-b=15 e=a*b=76 f=a/b=4.75 g=a%b=3 h=a//b=4 i=2**4=16

Relational Operator

< 

> 

>=

<=

== (equals to)

!= (not equals to)

These are used with conditional statement

Logical Operator

Logical OR (or)

Logical AND (and)

Logical Not (not)

These are also used with conditional straments

Here just remember at this stage, False is zero and true is other than Zero

If a=5, b=8

Then C=a or b

      =5 or 8

      =5

Id d= a and b

    =5 and 8

    =8

Bitwise Operator

Its hardly used in Python. So there wont be any focus on it

1)       Bitwise OR (I)

2)       Bitwise AND (&)

3)       Bitwise X-OR(^)

4)       Bitwise Leftshift(<<)

5)       Bitwise Rightshift(>>)

6)       Bitwise Complement (~)

Assigment Operator

=

+=

-=

X=

/=

%=

//=

Xx=

A+=b means a=a+b

Identity Operator

Only 2 functions

Is

Is not

a=10 b=20, c=10

print(a is b)=> false

print(a is c)=> True

Membership Operator

Only 2 functions

In

Not in

A=[10,20,30,40,50]

Print(30 in a)=> True

DAY 2- Learning Python