- Write a program to read file contents at a time
f = open(‘input.txt’,’r’)
print(f.read())
f.close()
- Write a program to read a file char by char
f = open(‘input.txt’,’r’)
print(f.read(1))
print(f.read(1))
f.close()
- Write a program to read a file line by line
f = open(‘input.txt’,’r’)
print(f.readline())
print(f.readline())
f.close()
- Write a program to read all lines in to a list
f = open(‘input.txt’,’r’)
print(f.read())
f.close()
- Write a program to write in to a file
f = open(‘input.txt1′,’w’)
f.write(“this is line1”)
f.close()
- Write a program to append to an existing file
f = open(‘input.txt’,’a’)
f.write(“nthis is newline”)
f.close()
- Write a program to print nth line and print range of lines
f=open(“input.txt”,”r”)
contents=f.readlines()
print(contents[5]) #prints 6th line
print(contents[6:12]) #prints from 7th to 11th
f.close()
- Write a Program to read the file and print
Output:Item: Pens,Quantity: 10,Price: 10.10
Pens,10,10.10
Pencils,20,15.14
Erasers,30,10
Box,10,50
Bags,10,200
f=open(“prices.txt”,”r”) #open the file in read mode
for line in f: #get a line
fields=line.rstrip().split(‘,’) #split the line
print(“Item: {},Quantity: {},Price: {}”.format(fields[0],fields[1],fields[2])) #print the 3rd field
f.close()
9. Write a program to get all the .txt files from the current working directory
import glob
import os
#print( os.getcwd())
files=glob.glob(‘*.txt’)
print (len(files))
print (files)
- Write a program to print all the lines which does not have ‘smile’
f=open(‘input3.txt’,’r’)
for line in f:
if “smile”.lower() in line.lower():continue
print(line)
Nellorean 