Python Assignment 4

 Assignment 4 : File Handling and Date-Time

Lab Assignments

SET A

1. Write a Python program to read an entire text file.

# Program to read the entire file using read() function

file = open("python.txt", "r")

content = file.read()

print(content)

file.close()

2. Write a Python program to compute the number of characters, words and lines in a file.

file = open("sample.txt", "r")

number_of_lines = 0

number_of_words = 0

number_of_characters = 0

for line in file:

  line = line.strip("\n")

  words = line.split()

  number_of_lines += 1

  number_of_words += len(words)

  number_of_characters += len(line)

file.close()

print("lines:", number_of_lines, "words:", number_of_words, "characters:", number_of_characters)

3. Write a Python script to print the current date in following format “Sun May 29 02:26:23

IST 2017”

import time; 

ltime=time.localtime();

print(time.strftime("%a %b %d %H:%M:%S %Z %Y",ltime));  #returns the formatted time 

SET B

1. Write a Python program to append text to a file and display the text.

def file_read(fname):

        from itertools import islice

        with open(fname, "w") as myfile:

                myfile.write("Python Exercises\n")

                myfile.write("Java Exercises")

        txt = open(fname)

        print(txt.read())

file_read('abc.txt')

2. Write a Python program to print each line of a file in reverse order.

input_file=open('a.txt','r')

for line in input_file:

 l=len(line)

 s=' '

 while(l>=1):

 s=s+line[l-1]

 l=l-1

 print(s)

input_file.close() 

3. Write a Python program to print date, time for today and now.

import datetime

now = datetime.datetime.now()

print("Current date and time: ")

print(now.strftime('%Y-%m-%d %H:%M:%S'))

print(now.strftime('%H:%M:%S on %A, %B the %dth, %Y'))

PROGRAMS FOR PRACTICE:

1. Write a Python program to read an entire text file.

2. Write a Python program to read first n lines of a file.

3. Write a Python program to append text to a file and display the text.

4. Write a Python program to read last n lines of a file.

5. Write a Python program to read a file line by line and store it into a list.

6. Write a Python program to read a file line by line store it into a variable.

7. Write a Python program to read a file line by line store it into an array.

8. Write a python program to find the longest words.

9. Write a Python program to count the number of lines in a text file.

10. Write a Python program to count the frequency of words in a file.

11. Write a Python program to get the file size of a plain file.

12. Write a Python program to write a list to a file.

13. Write a Python program to copy the contents of a file to another file .

14. Write a Python program to combine each line from first file with the corresponding line in second file.

15. Write a Python program to remove newline characters from a file.

Local time: 2018-12-20 13:10:44.260462

America/New_York time: 2018-12-20 13:10:44.260462

Europe/London time: 2018-12-20 13:10:44.260462

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16. Write a Python program that takes a text file as input and returns the number of words of a given text file.

Note: Some words can be separated by a comma with no space.

17. Write a Python program to extract characters from various text files and puts them into a list.

18. Write a python program to get Current Time

19. Get Current Date and Time using Python

20. Write a python | Find yesterday’s, today’s and tomorrow’s date

21. Write a python program to convert time from 12 hour to 24 hour format

22. Write a python program to find difference between current time and given time

23. Write a python Program to Create a Lap Timer

24. Convert date string to timestamp in Python

25. Find number of times every day occurs in a Year