In this lecture we will be learning about Comparison Operators in Python. These operators will allow us to compare variables and output a Boolean value (True or False).
If you have any sort of background in Math, these operators should be very straight forward.
First we’ll present a table of the comparison operators and then work through some examples:
Table of Comparison Operators
In the table below, a=3 and b=4.
| Operator | Description | Example |
|---|---|---|
| == | If the values of two operands are equal, then the condition becomes true. | (a == b) is not true. |
| != | If values of two operands are not equal, then condition becomes true. | (a != b) is true |
| > | If the value of left operand is greater than the value of right operand, then condition becomes true. | (a > b) is not true. |
| < | If the value of left operand is less than the value of right operand, then condition becomes true. | (a < b) is true. |
| >= | If the value of left operand is greater than or equal to the value of right operand, then condition becomes true. | (a >= b) is not true. |
| <= | If the value of left operand is less than or equal to the value of right operand, then condition becomes true. | (a <= b) is true. |
Let’s now work through quick examples of each of these.
Equal¶
In [1]:
2 == 2
Out[1]:
In [2]:
1 == 0
Out[2]:
Note that == is a comparison operator, while = is an assignment operator.
Not Equal
In [3]:
2 != 1
Out[3]:
In [4]:
2 != 2
Out[4]:
Greater Than
In [5]:
2 > 1
Out[5]:
In [6]:
2 > 4
Out[6]:
Less Than
In [7]:
2 < 4
Out[7]:
In [8]:
2 < 1
Out[8]:
Greater Than or Equal to
In [9]:
2 >= 2
Out[9]:
In [10]:
2 >= 1
Out[10]:
Less than or Equal to
In [11]:
2 <= 2
Out[11]:
In [12]:
2 <= 4
Out[12]:
Great! Go over each comparison operator to make sure you understand what each one is saying. But hopefully this was straightforward for you.
Next we will cover chained comparison operators
thefuture 