Tag: Python

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Python Dictionaries – del, clear

This is a continuation of Kiran’s Python Dictionaries post. There were few online and offline questions, so thought of writing a post on del and clear commands on Python Dictionary.

Few Dictionary operations

To better explain, let us create a sample dictionary for our explanation.

fruit= {"ORange":"I love ORange",
       "Apple":"Apple is good for health"}
print ("Entire defined dictionary values")
fruit

1. How to Delete a key from Dictionary

fruit= {"ORange":"I love ORange",
       "Apple":"Apple is good for health"}
#Delete command is as below
print ("Delete a single element")
del fruit["Apple"]
fruit

2. How to Delete entire Dictionary 

fruit= {"ORange":"I love ORange",
       "Apple":"Apple is good for health"}
print ('Delete the dictionary')
del fruit
fruit

3. How to Clear entire Dictionary 

fruit= {"ORange":"I love ORange",
       "Apple":"Apple is good for health"}
print ('Clear the dictionary elements')
fruit.clear()
fruit

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NO SQL, Python

A glance at Anaconda, Jupyter notebook and Python for beginners

Jupyter notebook is traditional IDE for Python. It is a very popular IDE for most of data professionals as its very easy to install and use.
Jupyter notebook basically includes 2 components – jupyter notebook Server and a Browser. Browser communicates to server and process the requests.Browser usually uses a default localhost:8888 to connect to jupyter server.

Now, let us look at Anaconda, a package manager which allows to install many libraries. When install Anaconda, Python and Jupyter comes along with the installation. To install Anaconda, go to https://anaconda.org (for individual -> https://www.anaconda.com/products/individual#windows) and download the latest file which is compatible to the workstation (depending on windows or Mac).

To launch jupyter, launch Anaconda navigator and then select jupyter, which would eventually open a browser where programmers can write and
run the codes.

Writing First Program in Jupyter notebook

1. Create a folder in Desktop to put save our sample work

2. Create python file by clicking New Python 3(in the screenshot)

3. It will open a code blocker where you can write programs

I am a beginner to Python and am writing these posts as I learn things for two main reasons, not to forget and to share with community. I would like to share your thoughts and experiences in comment section, so we all will be part of learning and sharing!

I’d like to grow my readership. If you enjoyed this blog post, please share it with your friends!

NO SQL, Python

Format Strings in Python

We have very powerful method str.format() in python through which you can do variable substitutions and value formatting.
Let’s understand the usage of format with couple of examples.

 
ex1

Formatters work by putting in one or more replacement fields and placeholders defined by a pair of curly braces { } into a string and calling the str.format(). The value we want to put into the placeholders and concatenate with the string passed as parameters into the format function.

format() method takes any number of parameters. But, is divided into two types of parameters:
Positional parameters – list of parameters that can be accessed with index of parameter inside curly braces {index} ,See the example below.

ex2

Keyword parameters – list of parameters of type key=value, that can be accessed with key of parameter inside curly braces {key}
See the example :
ex3

we have another method of formatting string literals , as shown below:

ex6

You could also call functions as shown below:

ex7

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NO SQL, Python

Introduction to Python

From today, we will start learning the most powerful and dynamic programming language popular for web development,big data, data science,and scripting.

Why Python:
1.You can create solutions quickly and others can understand them easily
2.Its an open source tool and has a great community when ever you are in trouble
3. No need of compilation
4.Cross platform,Runs anywhere, including Mac OS X, Windows, Linux, and Unix,
5.Comes with a large standard library that supports many common programming tasks such as connecting to web servers, searching text with regular expressions, reading and modifying files.
6.Is easily extended by adding new modules implemented in a compiled language such as C or C++.

You can find the more information here:
https://wiki.python.org/moin/BeginnersGuide/Overview

How to download Python:

You can download the Python Shell, using the below link
https://www.python.org/
Go to the above site, under downloads /Select OS type and down the latest version of Python ( 3.7.1)

After installing the exe, you can see the IDLE (Python 3.7) under Start->programs
or you can start the Python, by following the below steps
Go to Windows power shell program, and Type Python as shown below
Open python via Windows powershell

If you want to come out of Python, Press Control+z and Enter

We have many IDEs through which we can write Python code, I have listed top 5

1.PyCharm
2.Spyder
3.Eclipse+PyDev
4.IDLE – Which we have downloaded from above website
5.Atom

You can find more details about this in the below site
https://realpython.com/python-ides-code-editors-guide/

lets Finish this blog post with Simple Hello world Program.

Open Python IDLE and type print

first Python program

As you see python is a case sensitive language.

Thats it for now and we will continue to learn more about python in detail in upcoming posts.