Python.txt

Module 1
50 Assignments
45 hours
162 non graded quiz
1 minor project

Assessment will be done in the end.
50 percent of the assessment will be done on module 4 project+presentation
50 percent is written examination (2x)

Word File to be maintained: (Assignment for each module)
Question+Solution+Snapshots
Submitted on blackboard.

Anaconda
Eclipse //
Pycharm

Oracle.



Python is a programmig as well as a scripting language.
Interpreted
Oops
Short and easy language
open source and free

comments==documentation
# signle line start and end
''' or  """ triple single quotes start and end

use next line for continuation:: end line with backslash \

statements with () {} [] dont need \ for next line

python is case sensitive

print(" ",data type)
semicolon not needed

format specifiers not needed
print uses line concatenation
print("abc",10) answer= abc 10 (automatic space added)


inside print both single and double quotes can be used.

Two ways to print
print("%20s:%d"%('python',3000.34))

similar terminal as used in SQLPlus

Single variable has no data type. automatic assignment
Reference variable is object overhead.
type(variable)
write print(type(var)) for scripting.

string variable with mathematics
* concates same string without space n times
+ error
string + number is error
string+string is concatenation

scanning a value
input method
variable=input("message to user")
Every Input is a string by default
Typecase during or after the insertion
var=type(input())
or
after
var=type(var)

Tokens
1) Identifiers
same naming mechanism like C++ but see that Python keywords are different
no declaration
automatic assignment of data type

x=a+bj
a=real
b=imaginary
j=iota representation
print(x.real)
print(x.imag)

Different data types
integer
complex
float
string
boolean (True,False) //case sensitivity

2) Operators
2.1)Arithmetic
truncation division // gives integer quotation whereas mod % gives remainder
exponentiation ** 
3**2=9
2.2) Reltional
<> similar to not equal to !=
2.3) Assignment and Uniary Assignment operators also called shorthand assignment.
BCD assignment operator
a*=b+5 == a*=(b+5)

a=b=c=10 is allowed
a,b=2,5

swap values
a,b=b,a

2.4) Binary Operators
And
Or
Xor
Ones Complemetnt
left shift
right shift

2.5) logical
and
or 
not
write like this it has no symbol all small

2.6) Membership operators simlilar to SQL
In
not in
2.7) Identity Operators
 compare memory location
is 
not is
memory location is given by id(var)
here value is not of variable because it changes with values
here values have address and the current variable is attached to it.
id("hello")
1)hence multiple variables having same value will point to same value hence memory is saved.
2)Comparison: If address is same values are same

Indentation
no blocks are required
indentations (tabs) are needed for the current block
example
if x>5: //condition can be without parenthesis
	//if block
else:
	//else block
elif cond: //else if is shortened 

no switch case here

Looping
only entry

For and while

While
while condition:
	statements
in looping every print automatically goes in next line

Increment operator is not used








Python Operators Precedence
The following table lists all operators from highest precedence to lowest.

[ Show Example ]

Sr.No.	Operator & Description
1	
**

Exponentiation (raise to the power)

2	
~ + -

Complement, unary plus and minus (method names for the last two are +@ and -@)

3	
* / % //

Multiply, divide, modulo and floor division

4	
+ -

Addition and subtraction

5	
>> <<

Right and left bitwise shift

6	
&

Bitwise 'AND'

7	
^ |

Bitwise exclusive `OR' and regular `OR'

8	
<= < > >=

Comparison operators

9	
<> == !=

Equality operators

10	
= %= /= //= -= += *= **=

Assignment operators

11	
is is not

Identity operators

12	
in not in

Membership operators

13	
not or and

Logical operators