Python Programing Lab R16 EXERCISE

Python Programing Lab R16 EXERCISE - 6(b)

Aim:

Write a program to count frequency of characters in a given file. Can you use character frequency to tell whether the given file is a Python program file, C program file or a text file?

Description:

Traverse each character in the file and its occurrence is stored in the dictionary. Here, We are using the concept of files and a Dictionary.

Files:

Python provides basic functions and methods necessary to manipulate files by default. Some of the useful functions in this program are:

open():

Before we can read or write a file, we have to open it using Python‟s built-in open(). This function creates a file object, which would be utilized to call other support methods associated with it.

The Syntax for opening a file object in Python is:

file_object = open(“Name of the file”,”Mode of the file”)

read():

If we need to extract string that contains all characters in the file, We can use read().
TheSyntax for read() in Python is:

str = file_object.read()

Dictionary:

The dictionary is Python‟s built-in mapping type. Dictionaries map keys to values and these <key,value> pairs provides a useful way to store data in python. The only way to access the value part of the dictionary is by using the key.

We can specify the dictionary <key,value> pairs between '{' and '}'. <key,value> pairs arespecified as a list(separated by commas).

Program:

from collections import Counter

with open('netaji.txt','r') as f:

c=Counter()

for x in f:

print(x)

c+=Counter(x.strip())

print(c)

Output: