Oct. 12, 2012

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...
--------------------

Recommended Python Training – DataCamp

For Python training, our top recommendation is DataCamp.

Datacamp provides online interactive courses that combine interactive coding challenges with videos from top instructors in the field.

Datacamp has beginner to advanced Python training that programmers of all levels benefit from.

 



Read more about:
Disclosure of Material Connection: Some of the links in the post above are “affiliate links.” This means if you click on the link and purchase the item, I will receive an affiliate commission. Regardless, PythonForBeginners.com only recommend products or services that we try personally and believe will add value to our readers.