Operations on Variables in Python

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variable_operations_in_python

Skill - Boolean and Arithmetic Operations on variables in Python

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Skills Required

Please make sure to have all the skills mentioned above to understand and execute the code mentioned below. Go through the above skills if necessary for reference or revision

Boolean means True or False. For example

x = False
y = True

In the above code the variable x is assigned a boolean value True and y is assigned a boolean value False

== Operator

  • == comparison operator can be used to compare values on both sides and returns True only if both sides are equal. For example
# assign value to variables
x = 10
y = 15

# this will print False
print(x==y)

# this will print True
print(x+5 == y)

not Operator

  • not comparison operator will toggle a boolean value. For example
# assign value to variables
x = True

# this will print False
print(not x)
print(not True)

# this will print False
y = not x
print(y)

# this will print True
print(not (1==2))

and Operator

  • and comparison operator will give True only if both sides are True. For example
# this will print False
print(True and False)

# this will print True
print(True and True)

x = 10
y = 20

# this will print True
print((x==10) and (y == 20))

# this will print False, since the left condition is False
print((x==300) and (y == 20))

<, <=, >, >= Operators

The following are some important comparison operators for inequality equations

  • > is ‘greater than’ operator
  • >= is ‘greater than or equal to’ operator
  • < is ‘less than’ operator
  • <= is ‘less than or equal to’ operator
x = 10
y = 20

# this will print False
print((x > y))

# this will print True
print((x < y))

# this will print True
print((x <= y-10))

# this will print True
print((x+10 >= y))

or Operator

  • or comparison operator will give True if any of both sides are True. For example
# this will print True
print(True or False)

# this will print True
print(True or True)

# this will print False
print(False or False)

x = 10
y = 20

# this will print True
print((x==10) or (y == 30))

"""
this will print False, 
since both left and right conditions are False
"""
print((x == 40) or (y == 50))

Logical Operations

x = 10
y = 15

# add x and y and then assign to z
z = x + y

# subtract x and y and then assign to z
z = x - y

# multiply x and y and then assign to z
z = x * y

# divide x and y and then assign to z
z = x / y

# compute y power 3 and then assign to z
z = y**3

# floored division, It will return the integer part of the division operation. Example: 10 // 4 = 2 , 15 // 6 = 2
z = x // y

# modulo operation, it will return the remainder of the division operation. Example 18 % 4 = 2, 13 % 3 = 1
z = x % y

# calculating an arithmetic equation and storing in a variable
z = 2*x + x**2 + 3*y

Calculating an arithmetic equation

# calculating an arithmetic equation and storing in a variable
x = 10
y = 20

z = 2*x + x**2 + 3*y

print('The value of z =', end=' ')
print(z)
# this will print 180

Combining both comparison and arithmetic operators

# calculating an arithmetic equation and storing in a variable
x = 10
y = 20
z = 30

k = ( (2*x + x**2 + 3*y) > 4*z )

print('The value of k is', end=' ')
print(z)
# this will print True

Video

The video on this post can be found here

Online Interpreter

You can run these codes online at https://www.programiz.com/python-programming/online-compiler/

Further Reading

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