if else Statement in python

February 05, 2021
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If Statement šŸ’«:

Another name for an if-then statement is a conditional statement.it is use to print the true or false statement 

For Example:

a = 33
b = 200
if b > a:
print("b is greater than a")

Output: 

b is greater than a

If - Else Statement šŸ’«:

The if-else statement is used to execute both the true part and the false part of a given condition. If the condition is true, the if block code is executed and if the condition is false, the else block code is executed.

For Example:

a = 200
b = 33
if b > a:
  print("b is greater than a")
else:
  print("b is not greater than a")

Output:

b is not greater than a


Elif Statement šŸ’«:

The elif keyword is pythons way of saying "if the previous conditions were not true, then try this condition" .Else evaluates a single statement before closing the loop. Elif allows you to evaluate multiple statements before closing the loop.

For Example:

a = 33
b = 33
if b > a:
  print("b is greater than a")
elif a == b:
  print("a and b are equal")
elif a < b:
  print("a is greater than b")

Output:

a and b are equal


Program in which use of all if, elif and else:

a= input("Write 'square'or'rectangle'or'circle'or'Triangle'or'Ovel'or'all' of which you want to print:  ")
if a=="square":
 print("\t\t\t SQUARE")
 print("\t\t\t ________________")
 print("\t\t\t|                |")
 print("\t\t\t|                |")
 print("\t\t\t|                |")
 print("\t\t\t|     SQUARE     |")
 print("\t\t\t|                |")
 print("\t\t\t|                |")
 print("\t\t\t|________________|\n")
elif a=="rectangle":
 print("\t\t\t RECTANGlE")
 print("\t\t\t ______________________________")
 print("\t\t\t|                              |")
 print("\t\t\t|                              |")
 print("\t\t\t|          RECTANGlE           |")
 print("\t\t\t|                              |")
 print("\t\t\t|______________________________|")
elif a=="Ovel":
 print("\t\t\tOvel")
 print("\t\t\t      * * *     ")
 print("\t\t\t    *       *   ")
 print("\t\t\t   *  Ovel   *  ")
 print("\t\t\t   *         *  ")
 print("\t\t\t    *       *   ")
 print("\t\t\t      * * *     ")
elif a=="circle":
 print("\t\t\tCIRCLE")
 print("\t\t\t       * * *     ")
 print("\t\t\t    *         *   ")
 print("\t\t\t   *  CIRCLE   *  ")
 print("\t\t\t   *           *  ")
 print("\t\t\t    *         *   ")
 print("\t\t\t       * * *     ")
elif a=="Triangle":
 print("\t\t\tTRIANGLE")
 print("\t\t\t      /\      ")
 print("\t\t\t     /  \     ")
 print("\t\t\t    /    \    ")
 print("\t\t\t   /      \   ")
 print("\t\t\t  /TRIANGLE\  ")
 print("\t\t\t /__________\ ")
else:
    print("please write with the correct spelling ".upper())
    


Nested IfšŸ˜œ:

var = 100
if var < 200:
   print "Expression value is less than 200"
   if var == 150:
      print "Which is 150"
   elif var == 100:
      print "Which is 100"
   elif var == 50:
      print "Which is 50"
   elif var < 50:
      print "Expression value is less than 50"
else:
   print "Could not find true expression"

print "Good bye!"

output:

Expression value is less than 200
Which is 100
Good bye!
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