Python
@dhruvbaldawa on twitter
Show me the code!
'coz code speaks louder than words
Hello World
Python
print "Hello World"
C++
#include <iostream>
using namespace std;
int main (int argc, char** argv)
{
cout << "Hello World!";
return 0;
}
Java
public class HelloWorld {
public static void main(String[] args) {
System.out.println("Hello World");
}
}
Reading a file
Python
for line in open("filename"):
print line
C++
#include <iostream>
#include <fstream>
#include <string>
using namespace std;
int main () {
string line;
ifstream myfile ("filename");
if (myfile.is_open()) {
while ( myfile.good() ) {
getline(myfile,line);
cout << line << endl;
}
myfile.close();
}
else cout << "Unable to open file";
return 0;
}
Reading a file
Java
import java.io.*;
class FileRead {
public static void main(String args[]){
try{
FileInputStream fstream = new
FileInputStream("textfile.txt");
DataInputStream in = new
DataInputStream(fstream);
BufferedReader br = new BufferedReader(new InputStreamReader(in));
String strLine;
while ((strLine = br.readLine()) != null) {
System.out.println (strLine);
}
in.close();
}
catch (Exception e){
System.err.println("Error: " + e.getMessage());
}
}
}
Swapping
Wait for it !
a, b = b, a
Now you have some idea about the language
How about some cool demos ?
Demo 1
Visualizations
Demo 2
A Search Engine
Demo 3
A Web Application
Demo 4
Scripts which talk to the internet
FAQs
What is it ?
Who is using it ?
Who wrote it ?
How fast is it ?
Which platform does it run on ?
What can I do with it ?
What are the data types ?
About Python
- created by Guido van Rossum
- named after BBC show "Monty Python"
- first version released in 1989
- consistently ranked in top 8 most popular language since 2008
- won 2007 and 2010 "Programming Language of the Year"
Who is using Python ?
Courtesy: PyCon US 2012 website[6]
Who is using Python ?
- YouTube
- Dropbox
- Yahoo
- NASA
- Nokia
- IBM
- CIA
- Disqus
- Walt Disney
- ... and many more
Where can I run Python ?
Where can I run Python ?
- works on Windows, Linux and MacOSX.
- also works on Nokia Series 40 and Series 60.
- There are Python interpreters and packaging for Android.
- Python interpreters are also available for iOS.
- There are also various projects regarding running Python in browser.
What can I do with Python?
- Web Development
- Database Access
- Desktop GUIs
- Scientific and Numeric computing
- Network programming
- Games and 3D graphics
- Embedded systems
- ... sky is the limit !
Why Python ?
- free and open source
- cross platform
- clear and readable syntax
- rapid application development
- "batteries included" with a great "standard library"
- works great with C, Java, .NET and other technologies
- automatic memory management and garbage collection
Why Python ?
- significantly reduces development time and source code size.
- usually 3-5x shorter than equivalent Java programs
- usually 5-10x shorter than equivalent C++ programs
- helps the developer focus on code
- excellent language for prototyping
- ... and many more
Why not Python ?
- often just considered as a scripting language
- slower than compiled languages
- slower parts can often be compiled to C, to make them fast
Where can I learn Python?
Everybody is using Python to teach Programming
Where can I learn Python?
“Udacity’s courses so far have been using Python because it is overall, the most convenient language for teaching and learning. The natural syntax means students spend less 6me grokking code than with terser languages.”-- Chris Chew, Software Engineer, Udacity Inc.[3]
What next?
- Mumbai Python Users Group (MumPy): https://groups.google.com/forum/#!forum/mumpy
- Mumpy Facebook: https://www.facebook.com/groups/mumpy/
- Mumpy Twitter: @PythonMumbai
- Python India Community: http://python.org.in/
Questions ?
Contact me at: http://www.dhruvb.com/
Submit feedback: http://www.dhruvb.com/pyfeedback