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# Basic Operators

This section explains how to use basic operators in Python.

### Arithmetic Operators

Just as any other programming languages, the addition, subtraction, multiplication, and division operators can be used with numbers.

``````number = 1 + 2 * 3 / 4.0
print(number)
``````

Try to predict what the answer will be. Does python follow order of operations?

Another operator available is the modulo (%) operator, which returns the integer remainder of the division. dividend % divisor = remainder.

``````remainder = 11 % 3
print(remainder)
``````

Using two multiplication symbols makes a power relationship.

``````squared = 7 ** 2
cubed = 2 ** 3
print(squared)
print(cubed)
``````

### Using Operators with Strings

Python supports concatenating strings using the addition operator:

``````helloworld = "hello" + " " + "world"
print(helloworld)
``````

Python also supports multiplying strings to form a string with a repeating sequence:

``````lotsofhellos = "hello" * 10
print(lotsofhellos)
``````

### Using Operators with Lists

Lists can be joined with the addition operators:

``````even_numbers = [2,4,6,8]
odd_numbers = [1,3,5,7]
all_numbers = odd_numbers + even_numbers
print(all_numbers)
``````

Just as in strings, Python supports forming new lists with a repeating sequence using the multiplication operator:

``````print([1,2,3] * 3)
``````

## Exercise

The target of this exercise is to create two lists called `x_list` and `y_list`, which contain 10 instances of the variables `x` and `y`, respectively. You are also required to create a list called `big_list`, which contains the variables `x` and `y`, 10 times each, by concatenating the two lists you have created.

```x = object() y = object() # TODO: change this code x_list = [x] y_list = [y] big_list = [] print("x_list contains %d objects" % len(x_list)) print("y_list contains %d objects" % len(y_list)) print("big_list contains %d objects" % len(big_list)) # testing code if x_list.count(x) == 10 and y_list.count(y) == 10: print("Almost there...") if big_list.count(x) == 10 and big_list.count(y) == 10: print("Great!")``` ```x = object() y = object() # TODO: change this code x_list = [x] * 10 y_list = [y] * 10 big_list = x_list + y_list print("x_list contains %d objects" % len(x_list)) print("y_list contains %d objects" % len(y_list)) print("big_list contains %d objects" % len(big_list)) # testing code if x_list.count(x) == 10 and y_list.count(y) == 10: print("Almost there...") if big_list.count(x) == 10 and big_list.count(y) == 10: print("Great!")``` ```Ex().check_object('x_list').has_equal_value(expr_code = 'len(x_list)') Ex().check_object('y_list').has_equal_value(expr_code = 'len(y_list)') Ex().check_object('big_list').has_equal_value(expr_code = 'len(big_list)') success_msg('Good work!')```

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