DEV Community: SaranJoel

Conditional Statement in Python

SaranJoel — Fri, 03 Sep 2021 12:40:03 +0000

So after looking into the Datatypes,we got is
Conditional statement.
What are Conditional Statements in Python?and why do we need them?
The reasons are:
Conditional Statement in Python perform different computations or actions depending on whether a specific Boolean constraint evaluates to true or false. Conditional statements are handled by IF statements in Python.
Decision making is required when we want to execute a code only if a certain condition is satisfied.
The if…elif…else statement is used in Python for decision making.
so we have different decision making statement they are
1.if
2.if-else
3.elif
4.Nested

1.if

if Statement Syntax

if condition:
   code()

If the given condition is true,the code will be executed
if it is false the process will end.

age=12
if age<21:
  print("you are under age")

This is how we use the if statement

2.if else

This is the extention for the if statement.So that even if the
the 'if' condition becomes false we need to perform another code in that cases we use this if-else statements.

if condition:
  code()
else:
  code()

here if the condition in the 'if' becomes true,then it executes code(1)
if the 'if' condition is false then the code(2) is executed
here Example:

Age =11
if age<21:
  print("you are under age")
else:
  print("you are an youngster")

so next in the table we have

3.elif

elif is a shortcut of else if condition statements. In Python one or more conditions are used in the elif statement.the flow :

the syntax for the elif is

if condition0:
    code()
elif condition1:
    code()
elif condition2:
    code(2)
else:
    code()

this is the syntax of the elif
as we see if the condition in the 'if' : false
the next condition is checked which is in elif block, if the conditions true the code will be executed,And so.
so lets see an Ex:

num=1,num=-23,num=0
if num > 0:
    print("Positive number")
elif num == 0:
    print("Zero")
else:
    print("Negative number")

4.Nested

The nested is to do the condition checking simultaneously.
we have
1.Nested if
2.Nested if else

1.Nested if

A nested if is an if statement that is the target of another if statement. Nested if statements mean an if statement inside another if statement.Yes, Python allows us to nest if statements within if statements. we can place an if statement inside another if statement.
the syntax will be

if (condition1):
   code()
   if (condition2): 
      code()

an Ex

a= 1001  
if a> 100:  
  print("Above 100")  
  if a > 1000:  
    print("and also above 1000")

so the next is

2.Nested if else

using one “if else” statement inside other if else statements it is called nested if else statement.
the syntax for this is

if(condition):  
  if code  
     if(condition):  

       if code  

     else:  

        else code  


else:  

 else code

lets see an Ex:

a=1456  
if a> 100:  
  print("Above 100")  
  if a > 1000:  
    print("and also above 1000")  
  else:  
    print("and also below 1000")  
else:  
    print("below 100")

so these are the conditional statements in the pyhton
so once again why do we use these conditional statements?
Conditional statements are also called decision-making statements. We use those statements while we want to execute a block of code when the given condition is true or false.
well see you in the next post.
print("thank you!").

Data Types in python

SaranJoel — Sun, 29 Aug 2021 14:28:17 +0000

In my last post we came across the string.
Print() built in function in python
well,i haven't said any thing about,what is string.
So,this is all bout it
The string comes under DataTypes.
what Exactly are DataTypes?
=>DataTypes - are used to classify one particular type of data.
This is important because the specific data type you use will determine what values you can assign to Variable and what you can do to it.
Data types are important in web applications or software or programs in many sense.
Data types gives meaning to data.
So,thats said

There are different DataTypes
1.Integer-int
2.String -str
3.Float -float
4.Boolean-True,False
Indetail

1.Integer

This Integer is denoted by keyword:'int'
this is used to define the variable it is an integer.
as we know integers are-0,1,2,3,4.......... and even -ve numbers.
The range of this int is from -2,147,483,647 to 2,147,483,647 for 9 or 10 digits of precision.
The int can be defined as
x=12
here we are using variable x the store the DataType-int
to know the datatype of the variable-x we can use the 'type()' built in function

if we are using a large number we can split by using an Underscore(_),ie.123_456_789
this underscore doesn't change the value of the number,it is taken
as 123456789.

2.String

this string is denoted by keyword:'str'

This string is group of characters,the characters in the sence a,v,e,r,o,e,y,1,3,54..... what ever the keys that are in keyboard.
But,This string must be denoted in Double Quotations
like :
x="Hola"
x="12345"
x="/'.;p]["

And we can also check the type by using type() built in function to see what DataType it is,

if we want to print the str multiple time,we cant just write print() so many time
coz it sucks and wast of time.that dosent make us much of a programmer if we cant minimize the size and time.
As time and size are very crucial in programming.
So,is there a way to do that ?
yes,there is way we can print multiple times by using \n at the end of the string
it is done like :

we can add two str we use + sign this is known as String Concatenation

f-String
Some times in during printing the result we want to specify the result in the string in print().
But,it is not possible to print both string and result(as it might be other DataTypes-int,float,boolean)
so to make that happen we need to use this f-String
we can do it like:

In this string wecan specify the certain character if we need to it canbe done by using[] to specify the index of the character.
like:

so now next to

3.Float

float is denoted by the keyword:float

To assign the float to the variable by
x=1.23

Now The Last One

4.Boolean

Booleans represent one of two values: True or False.

this is used as

If there are any Suggestions Or corrections fell free to say
Print("Thank YOu!")

Print() built in function in python

SaranJoel — Sat, 28 Aug 2021 10:49:27 +0000

print() is a built in function in python
we use print() function to print the object in it
which is given in double Quotation
which will be like:
Print("object")
or we can do with the old classic word
ie. print("Hello World!")

We can only print ,if the object is in b/w the in double Quotation.
if the object is not in b/w the double Quotation it would give an error.

the error would be syntax error
why is it giving an error?
should it just print the object as it before?
what is the problem in printing with out double Quotation?

The problem in printing the object is,because the computer think the 'object' is also an 'built in function' and after thinking that it searches in the built in functions,
as the object will not be present in the built in functions ,it will give an error .
So,we have to specify the object in double Quotation.