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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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