This document contains concepts related to basic Python coding skills for web frameworks. It discusses proper indentation, case sensitivity, shebang lines, comments, and functions. Comments can be used to disable code or explain portions that are difficult to understand. Functions are reusable code that perform tasks, and built-in functions like print() and input() are commonly used. Input() allows user input as a string that can then be converted to other data types.

1. PYTHON PROGRAMMING WITH
WEB FRAMEWORKS – CSE304
This presentation contains the
concepts related to Basic coding
skills

2. Basic Coding Skills
• Python programming relies on proper indentation
• Case sensitive
• Standard indentation is four spaces
• Implicit continuation (use four spaces in the
continuation line)
print ("Sum = ", str(10+20)
+ "Diff = ", str(20-10))
• Explicit continuation (it is not recommended)
print ("Sum = ", str(10+20)
+ "Diff = ", str(20-10))
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3. Basic Coding Skills
• A program typically starts with a shebang line that
begins with a hash (#) symbol followed by a bang (!)
symbol. (identifies the interpreter when running the
program).
• If you're using IDLE to run your programs, you don't
need a shebang line.
• However, it's generally considered a good practice to
include one.
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4. Comments
• Comments can be used to disable statements that you
don't want to run when you compile and run a program.
• Comments starts with a #, and Python will ignore them.
• Two types
– Block comments
– Inline comments
• Guidelines for using comments
– Use comments
• to describe portions of code that are hard to understand, but
don't overdo them.
• to comment out statements that you don't want to test.
– If you change the code that's described by comments,
change the comments too.
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5. Comments
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6. Comments
• Python does not really have a syntax for multi line comments.
• To add a multiline comment you could insert a # for each line.
• For writing “proper” multi-line comments in Python is to use
multi-line strings with the """ syntax in creative ways. Here’s an
example:
"""
This is a "block comment" in Python, made
out of a mult-line string constant.
This actually works quite well!
""“
• However, be careful where you place these “comments” in the
code. If the string follows right after a function signature, a
class definition, or at the start of a module, it turns into a
docstring which has a different meaning altogether in Python:
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7. How to use functions ?
• A function is a reusable unit of code that performs a
specific task.
• Many built-in functions (in Python) that do common
tasks like getting input, printing output and etc.
• When you call a function, you code the name of the
function followed by a pair of parentheses. Within
the parentheses, you code any arguments that the
function requires, and you separate multiple
arguments with commas.
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8. How to use functions ? – print()
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9. How to use functions ? – input()
• The input() function allows a user to insert a value
into a program.
• input() returns a string value. You can convert the
contents of an input using any data type.
• For instance, you can convert the value a user inserts
to a floating-point number.
• For example:
x=input("Enter your name")
print("Welcome to Python Programming ", x)
I/P: III Year Students
O/P: Welcome to Python Programming III Year Students
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