Python programming : Standard Input and Output
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The document provides comprehensive information on using print statements in Python, detailing different formats and methods for outputting strings, variables, and formatted strings. It also covers input statements and command line arguments, including the use of the argparse module for parsing arguments. Examples are included to illustrate the various functionalities and syntax associated with these output and input operations.
![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](https://image.slidesharecdn.com/stdinputoutput-190509114755/85/Python-programming-Standard-Input-and-Output-6-320.jpg)
![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](https://image.slidesharecdn.com/stdinputoutput-190509114755/85/Python-programming-Standard-Input-and-Output-8-320.jpg)
Python programming : Standard Input and Output
- 1. Standard Input & Output Team Emertxe
- 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)
- 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