More Basic Python Operators¶
We have already learned multiple Python operators such as
+,=,-,*,/,>,<,>=,<=,and,or,not,in,not in and so on.
In this section we will learn some more. Create a new Jupyter Notebook
and name it more_basic_operators to follow along.
Modulus Operator %¶
The operator % is called the modulo operator.
It gives the remainder when performing division between two
numbers. For example, if you divide 4 by 2 the remainder is 0.
Therefore, 4 % 2 would return 0. Another example is when
you do 9 divided by 4. The remainder is 1 so 9 % 4 would
return 1.
4 % 2
0
print(9 % 4)
1
We can use the % operator to check if a number is even.
For example, the number n is even if n % 2 returns 0
because the number 2 would divide evenly into n.
6 % 2 # 6 is even because remainder is 0
0
10 % 2 # 10 is even because remainder is 0
0
13 % 2 # 13 is odd because remainder is not 0.
1
You can also use % to check if a number is a multiple of any given number. If you do a % b and get a remainder of 0, then it means that a is a multiple of b. This just means that b divides into a evenly with a remainder of 0.
123 % 3 # returns 0 so 123 is a multiple of 3
0
256 % 32 # returns 0 so 256 is multiple of 32
0
99 % 45 # does not return 0 so 99 is not a multiple of 45
9
Assignment Operators¶
We have already learned about the = operator.
a = 1
print(a)
1
But there are some other operators which you will often see coders use. For example, you will often see the pattern:
i = 0
for x in range(4):
print(i)
i = i + 1
0
1
2
3
Another way of writing i = i + 1 is i += 1
i = 0
for x in range(4):
print(i)
i += 1 # is the same as i = i + 1
0
1
2
3
In general, a += b is the same as a = a + b. It is good to know about
this because many Python coders will use these little shortcuts operators.
Here are some others ones:
a += bis the same asa = a + ba -= bis the same asa = a - ba *= bis the same asa = a * ba /= bis the same asa = a / b
Feel free to use these when you want.