♠ Posted by Unknown in Python
Reading Input from the Console in Python
The input() function
asks the user to input a value for the variable. Default value entered as a
string.
Python: Comments
♠ Posted by Unknown in Python
Comments in Python
In Python, comments are preceded by a pound sign (#) on
a line, called a line comment, or enclosed between three consecutive single
quotation marks (''') on one or several lines, called a paragraph comment. When
the Python interpreter sees #, it ignores all text after # on the same line.
When it sees ''', it scans for the next ''' and ignores any text between the
triple quotation marks.
For Example:
# This program displays one message
''' This program displays
Two messages
'''
Line Continuation Symbol in Python
In some cases, the Python
interpreter cannot determine the end of the statement written in multiple
lines. We can place the line
continuation character (\) at the end of the line to tell the interpreter
that the statement is continued on the next line. For example, the following
statement
fact = 1 * 2 * 3 * 4 *
\
5 * 6
is equivalent to
fact = 1 * 2 * 3 * 4 *
5 * 6
Python: Creating Source Code Files
♠ Posted by Unknown in Python
Creating Source Code File in Python
Entering Python Statement
at the statement prompt >>> is convenient, but the statements
are not saved. To save statements for later use, you can create a python file
to store the statements. The file can be created using editor, that file is
called a Python source file or script file, or module. By
convention, Python files are named with the extension .py.
Running a Python
program from a script file is known as running Python in script mode.
Typing a statement at the statement prompt >>> and executing it
is called Python in interactive mode.
To create new Python
file in IDLE, select file menu à New
File. It opens new file window type following lines and save it as “Example01.py”.
Now Click Run (F5) from Run menu of window. Control transfer to IDLE statement
prompt and show the output.
Example:
Example01.py
#Display two messages
print(“Welcome to
world of Python…”)
print(“Hello Friends…”)
Python: Getting Started
♠ Posted by Unknown in Python
Getting Started with Python
Let’s get started by writing
a simple Python program that displays the message “Welcome to world of
Python…” on the console.
Assume you have Python
installed on the OS. You can start Python in a command window by typing “Python”
at the command prompt, as shown in below figure. Or by using IDLE,
as shown in another figure. IDLE (Interactive DeveLopment Environment)is an
Integrated Development Environment (IDE) for Python.
Python command-line
and IDLE can also be accessed directly from the Windows Start menu and
in Python group.
Python: History
♠ Posted by Unknown in Python
Python: History
Since 1990, Python was
created by Guido van Rossum in the Netherland and was named after well-known British
Monty Python’s Flying Circus. Rossum developed Python as a hobby, and Python
has become a popular programming language widely used in industry and academia
due to its simple, concise, and intuitive syntax and extensive library.
Python is a
general-purpose programming language. That means you can use Python to
write code for any programming task. Python is now used in the Google Search
Engine, in mission-critical projects at NASA, and in transaction processing at
the New York Stock Exchange.
Python is interpreted,
which means that Python code is translated and executed by an interpreter.
Python is an object-oriented programming (OOP)
language. Data in Python are objects created from classes.
