Using math in python

Math in Python

```The Python distribution includes the Python interpreter, a very simple development
environment, called IDLE, libraries, tools, and documentation.

Python is preinstalled on many (if not all) Linux and Mac systems,
but it may be an old version.
```

Calculator

```To begin using the Python interpreter as a calculator, simple type python in the
shell.
```
```>>> 2 + 2
4

>>> 4 * 2
8

>>> 10 / 2
5

>>> 10 - 2
8
```

Counting with variables

```Put in some values into variables to count the area of a rectangle
```
```>>> length = 2.20
>>> width = 1.10
>>> area = length * width
>>> area
2.4200000000000004
```

Counter

```Counters are useful in programming to increase or decrease a value everytime it
runs.
```
```>>> i = 0
>>> i = i + 1
>>> i
1
>>> i = 1 + 2
>>> i
3
```

Counting with a While Loop

```Here is an example showing when it's useful to use counters
```
```>>> i = 0
>>> while i < 5:
...     print i
...     i =  i + 1
...
0
1
2
3
4

```
```The program counts from 0 to 4. Between the word while and the colon, there is an
expression that at first is True but then becomes False.

As long as the expression is True, the following code will run.

The code that needs to be run has to be indented.

The last statement is a counter that adds 1 to the value for everytime the loop
runs.
```

Multiplication table

```Making a multiplication table in Python is simple.
```
```
table = 8
start = 1
max = 10
print "-" * 20
print "The table of 8"
print "-" * 20
i = start
while i <= max:
result = i * table
print i, " * ", table, " =" , result
i = i + 1
print "-" * 20
print "Done counting..."
print "-" * 20

```
```
>>Output:

--------------------
The table of 8
--------------------
1  *  8  = 8
2  *  8  = 16
3  *  8  = 24
4  *  8  = 32
5  *  8  = 40
6  *  8  = 48
7  *  8  = 56
8  *  8  = 64
9  *  8  = 72
10  *  8  = 80
--------------------
Done counting...
--------------------
```

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