Python Basics- Lesson-5

Good Morning Boys.

Welcome to the fifth session of the online classes for Python Programing.

Let us look at the solutions of the Exercise given yesterday:

1. Accept a number from the user . Display an appropriate message .

num=input("Enter a number")

2. Accept a name from the user . Display an appropriate message .

name=input("Enter your name")

3. Accept the name and age of the user. Display appropriate messages.

name=input("Enter your name")

age=input("Enter your age")

4. Accept two numbers from the user. Display appropriate messages before taking the input.

num1=input("Enter the first number")

num2=input("Enter the second number")

5. Accept a number from the user and typecast it to float.

num=float(input("Enter the number"))

If you have any doubt,feel free to share.

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By the end of this session, you will be able to 

• Understand the purpose and syntax of print( ) function
• Impact of various formats of Print( ) functions.

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The new topic of discussion today is the print () function.

PURPOSE:

The print() function prints the specified message to the screen, or other standard output device.

The message can be a string, or any other object, the object will be converted into a string before written to the screen.

5.1. Quick Example

In order to print the Hello world string, use the print() function as follows:

>>> print("Hello")
Hello

is the correct way to print a string. Note; however, that is Python 2.X, you could also write:

>>> print "Hello"
Hello

5.2. print blank line(s)

Let us print 5 blank lines. You can naively type:

print(5 * "\n")

or:

print("\n\n\n\n\n")

or even better:

print(5 * "\n")

5.3. Print an object without a trailing newline

By default, the print function add a trailing line. To prevent this behavious, add a comma after the statement:

>>> x, y = 1, 2
>>> print(x),; print(y)
1 2

you could use:

print x,y,

5.4 Special characters

To escape the sign %, just double it:

>>> print "This is a percent sign: %%"
This is a percent sign: %

Other special characters similar to some other languages are summarized in the following table:

character	Decimal	Description
\		statement continues on next line
\	92	backslash
\’	39	Single quote
\”	34	Double quote
\a	7	Bell
\b	8	Backspace
\f		Formfeed
\n	10	newline
\r	13	carriage return
\t	9	tabulation
\v	11	vertical tabulation
\0 \000		null value
\ooo		octal value o in (0..7)
\xhh		hexadecimal value (0..9, a..f; A..F)
\uxxxx		Unicode character value

EXERCISE

Write the output of the following program:

                                                                                                                                               

Q1) 

name = Input("Enter your name : ") # suppose the user enters John

L = float(input "Enter length of Rectangle : ")) # suppose the user enters 12

B = float(input("Enter breadth of Rectangle : “) # suppose the user enters 24

Area = L * b

print("Hello!", name)

       print("The area of Rectangle is : " , Area)                                                                                                                                    

Q2) 

 A = 75

   B = 3

   C = 200

   D = C + B - A

   C = (D - (D % 10)) * 10

    print(D//10, " KM equals to ", C*10," Meters ")

    print("Dist. from Delhi to Ludhiana is",4**B + A, "KM")

NOTE %- is known as the MODULUS operator and is used to get remainder on division.           //-  is known as the integer division operator and is used to get quotient in integer form   
         **- is known as the EXPONENTIAL operator and is used to raised to power.