Python for Machine Learning Pt. 1
What is Python?
Python is a high level, simple, easy to use and read yet relatively slow programming language. Its versatility, community, simplicity and presence of diverse libraries makes it a favorite for a lot of tasks, including Machine learning.
We will be giving you a path to learn python, which you should follow with a lot of practice of your own. So, let’s get started!
Boolean’s Git repository: here
Refer to “intro to python-1” for this blog.
As an unsaid programming tradition our first program shall be “Hello world!”. In python its relatively easy. Just write print(“Hello world!”) and it’ll get the job done.
>>> print(“Hello world!”)Hello world!
In python, there are various data types like:
· String (any word or sentence)
· Integer (any integer number)
· Float (any decimal number)
· Bool (True or False/ 0 or 1)
Moreover, the equal sign (=) is used to assign values to variables.
counter = 100 # An integer assignmentmiles = 1000.0 # A floating pointname = “John” # A string
Subsets of strings can be taken using the slice operator ([ ] and [:] ) with indexes starting at 0 in the beginning of the string and working their way from -1 at the end.
The plus (+) sign is the string concatenation operator and the asterisk (*) is the repetition operator. Also, python indexing starts from 0 not 1
>>> print str #Prints complete stringHello World!>>> print str[2:5] #Prints characters starting from 3rd to 5thllo
For more about strings, refer to “intro to python-1” in Boolean repository
Assume variable a holds 10 and variable b holds 20, then-
You can run the verify the above results.
If else statements
The if/else statements in python works the same way as in other languages, only with a simpler syntax
Decision structures evaluate multiple expressions which produce TRUE or FALSE as outcome. You need to determine which action to take and which statements to execute if outcome is TRUE or FALSE otherwise.
You will find more examples in “intro to python-1” in Boolean’s git repository
A loop statement allows us to execute a statement or group of statements multiple times. The following diagram illustrates a loop statement –
You will find examples in the git repository notebook “intro to python-1”.
Find the introductory blog here
Written by Ashutosh Arya