09_comparison_operators.py

#======================================================================================
#                               COMPARISON OPERATORS
#--------------------------------------------------------------------------------------
# Comparison operators compares two values and return True or False based on the result.
#======================================================================================

#----------------------------------------
# Operator   |   Meaning                |
#----------------------------------------
#   ==       |   equal to               |
#   !=       |   not equal to           |
#   >        |   greater than           |
#   <        |   less than              |
#   >=       |   greater than or equal  |
#   <=       |   less than or equal     |
#----------------------------------------

#--------------------------------------------------------------------------------------
# Value Operator Value ---> True/False
#--------------------------------------------------------------------------------------
# Value            (3  > 2 )      --->True
# Variable(x=5)    (x  < 2 )      --->False 
# Expression       (2-1 != 2)     --->True
# Function         (len("hi")==3) --->False
#--------------------------------------------------------------------------------------

#--------------------------------------------------------------------------------------
# Basic Comparison operators
#--------------------------------------------------------------------------------------
print(10 == 10)
print(10 != 10)
print(7 > 3)
print(7 >= 3)
print(3 < 7)
print(7 <= 7)

#--------------------------------------------------------------------------------------
# We can also compare strings
#--------------------------------------------------------------------------------------
print("a" == "a")
print("a" == "A") # python is case-sensitive("a" and "A" are treated differently)
print("a" < "b")

#--------------------------------------------------------------------------------------
# assignment(=) vs comparison(==)
#--------------------------------------------------------------------------------------
x = "a"             # assignment
print(x == "a")     # True(comparison)

#--------------------------------------------------------------------------------------
# chained comparison--check multiple conditions in one line, just like math
#--------------------------------------------------------------------------------------
print(1<4<6)

#--------------------------------------------------------------------------------------
# chained comparisons work like SQL's BETWEEN They check if a value is between two bounds
#--------------------------------------------------------------------------------------
# Is age between 19 and 30 ?
age = 20
print(18 <= age <= 30)