Python programming : Standard Input and Output

May 9, 20193 likes6,937 views

Emertxe Information Technologies Pvt Ltd

Python provides numerous built-in functions that are readily available to us at the Python prompt. Some of the functions like input() and print() are widely used for standard input and output operations respectively.

Output Statements
Print()
 print(), when called simply throws the cursor to the next line
 Means, a blank line will be displayed

Output Statements
Print(“string”)
Example Output
print()
Prints the 'n' character
print("Hello") Hello
print('Hello') Hello
print("Hello nWorld") Hello
World
print("Hello tWorld") Hello World
print("Hello nWorld") Hello nWorld
print(3 * 'Hello') HelloHelloHello
print("Hello"+"World") HelloWorld
print("Hello","World") Hello World

Most read

CLA
Parsing CLA: Steps
● Step-1: Import argparse module
import argparse
● Step-2: Create an Object of ArgumentParser
parser = argparse.ArgumentParser(description="This program displays square of two numbers")
● Step-2a: If programmer does not want to display description, then above step can
be skipped
parser = argparse.ArgumentParser()
● Step-3: Add the arguments to the parser
parser.add_argument("num", type=int, help="Enter only int number.")
● Step-4: Retrieve the arguments
args = parser.parse_args()
● Step-4: Retrieve the arguments
● Step-5: Access the arguments
args.num

Output Statements
Print(variable list)
Example Output
a, b = 1, 2
print(a, b) 1 2
print(a, b, sep=",") 1,2
print(a, b, sep=':') 1:2
print(a, b, sep='---') 1---2
print("Hello", end="")
print("World")
HelloWorld
print("Hello", end="t")
print("World")
Hello World

Output Statements
Print(object)
Example Output
lst = [10, 'A', "Hai"]
print(lst) [10, 'A', 'Hai']
d = {10: "Ram", 20: "Amar"}
print(d)
{10: 'Ram', 20: 'Amar'}

Objects like list, tuples or dictionaries can be displayed

Output Statements
Print(“string”, variable list)
Example Output
a = 2
print(a, ": Even Number")
print("You typed", a, "as Input")
2 : Even Number
You typed 2 as Input

Output Statements
Print(formatted string)
Syntax: print("formatted string" % (varaible list))
Example Output
a = 10
print("The value of a: %i" % a) The value of a: 10
a, b = 10, 20
print("a: %dtb: %d" % (a, b))
a: 10 b: 20
name = "Ram"
print("Hai %s" % name)
print("Hai (%20s)" % name)
print("Hai (%-20s)" % name)
Hai Ram
Hai ( Ram)
Hai (Ram )
print("%c" % name[2]) m
print("%s" % name[0:2]) Ra
num = 123.345727
print("Num: %f" % num)
print("Num: %8.2f" % num)
Num: 123.345727
Num: 123.35

Output Statements
Print(formatted string)
Syntax: print("formatted string" % (varaible list))
Example Output
a, b, c = 1, 2, 3
print("First= {0}". format(a))
print("First= {0}, Second= {1}". format(a, b))
print("First= {one}, Second= {two}". format(one=a, two=b))
print("First= {}, Second= {}". format(a, b))
First= 1
First= 1, Second= 2
First= 1, Second= 2
First= 1, Second= 2
name, salary = "Ram", 123.45
print("Hello {0}, your salary: {1}". format(name, salary))
print("Hello {n}, your salary: {s}". format(n=name, s=salary))
print("Hello {:s}, your salary: {:.2f}". format(name, salary))
print("Hello %s, your salary: %.2f" % (name, salary))
Hello Ram, your salary: 123.45
Hello Ram, your salary: 123.45
Hello Ram, your salary: 123.45
Hello Ram, your salary: 123.45

Input Statements
Input()
Example
str = input()
print(str)
str = input("Enter the name: ")
print(str)
a = int(input("Enter the number: "))
print(a)
b = float(input("Enter the float number: "))
print(b)

CLA
Example
1 #To display CLA
2
3 import sys
4
5 #Get the no. of CLA
6 n = len(sys.argv)
7
8 #Get the arguments
9 args = sys.argv
10
11 #Print the 'n'
12 print("No. Of CLA: ", n)
13
14 #print the arguments in one shot
15 print(args)
16
17 #Print the arguments one by one
18 for i in args:
19 print(i)

CLA
Parsing CLA
●
argparse module is useful to develop user-friendly programs
●
This module automatically generates help and usage messages
●
May also display appropriate error messages

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Python programming : Standard Input and Output

1. Standard Input & Output Team Emertxe

2. Output Statements

3. Output Statements Print()  print(), when called simply throws the cursor to the next line  Means, a blank line will be displayed

4. Output Statements Print(“string”) Example Output print() Prints the 'n' character print("Hello") Hello print('Hello') Hello print("Hello nWorld") Hello World print("Hello tWorld") Hello World print("Hello nWorld") Hello nWorld print(3 * 'Hello') HelloHelloHello print("Hello"+"World") HelloWorld print("Hello","World") Hello World

5. Output Statements Print(variable list) Example Output a, b = 1, 2 print(a, b) 1 2 print(a, b, sep=",") 1,2 print(a, b, sep=':') 1:2 print(a, b, sep='---') 1---2 print("Hello", end="") print("World") HelloWorld print("Hello", end="t") print("World") Hello World

6. Output Statements Print(object) Example Output lst = [10, 'A', "Hai"] print(lst) [10, 'A', 'Hai'] d = {10: "Ram", 20: "Amar"} print(d) {10: 'Ram', 20: 'Amar'}  Objects like list, tuples or dictionaries can be displayed

7. Output Statements Print(“string”, variable list) Example Output a = 2 print(a, ": Even Number") print("You typed", a, "as Input") 2 : Even Number You typed 2 as Input

8. Output Statements Print(formatted string) Syntax: print("formatted string" % (varaible list)) Example Output a = 10 print("The value of a: %i" % a) The value of a: 10 a, b = 10, 20 print("a: %dtb: %d" % (a, b)) a: 10 b: 20 name = "Ram" print("Hai %s" % name) print("Hai (%20s)" % name) print("Hai (%-20s)" % name) Hai Ram Hai ( Ram) Hai (Ram ) print("%c" % name[2]) m print("%s" % name[0:2]) Ra num = 123.345727 print("Num: %f" % num) print("Num: %8.2f" % num) Num: 123.345727 Num: 123.35

9. Output Statements Print(formatted string) Syntax: print("formatted string" % (varaible list)) Example Output a, b, c = 1, 2, 3 print("First= {0}". format(a)) print("First= {0}, Second= {1}". format(a, b)) print("First= {one}, Second= {two}". format(one=a, two=b)) print("First= {}, Second= {}". format(a, b)) First= 1 First= 1, Second= 2 First= 1, Second= 2 First= 1, Second= 2 name, salary = "Ram", 123.45 print("Hello {0}, your salary: {1}". format(name, salary)) print("Hello {n}, your salary: {s}". format(n=name, s=salary)) print("Hello {:s}, your salary: {:.2f}". format(name, salary)) print("Hello %s, your salary: %.2f" % (name, salary)) Hello Ram, your salary: 123.45 Hello Ram, your salary: 123.45 Hello Ram, your salary: 123.45 Hello Ram, your salary: 123.45

10. Input Statements

11. Input Statements Input() Example str = input() print(str) str = input("Enter the name: ") print(str) a = int(input("Enter the number: ")) print(a) b = float(input("Enter the float number: ")) print(b)

12. Command Line Arguments

13. CLA Example 1 #To display CLA 2 3 import sys 4 5 #Get the no. of CLA 6 n = len(sys.argv) 7 8 #Get the arguments 9 args = sys.argv 10 11 #Print the 'n' 12 print("No. Of CLA: ", n) 13 14 #print the arguments in one shot 15 print(args) 16 17 #Print the arguments one by one 18 for i in args: 19 print(i)

14. CLA Parsing CLA ● argparse module is useful to develop user-friendly programs ● This module automatically generates help and usage messages ● May also display appropriate error messages

15. CLA Parsing CLA: Steps ● Step-1: Import argparse module import argparse ● Step-2: Create an Object of ArgumentParser parser = argparse.ArgumentParser(description="This program displays square of two numbers") ● Step-2a: If programmer does not want to display description, then above step can be skipped parser = argparse.ArgumentParser() ● Step-3: Add the arguments to the parser parser.add_argument("num", type=int, help="Enter only int number.") ● Step-4: Retrieve the arguments args = parser.parse_args() ● Step-4: Retrieve the arguments ● Step-5: Access the arguments args.num

16. THANK YOU

Python programming : Standard Input and Output

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