Day 3File Handling.ipynb

Kernel: Python 3

File Handling

File handling and allows users to handle files i.e., to read and write files, along with many other file handling options, to operate on file.

f=open("i.txt","a")#creating a text file 
f.write("Machine Learning ")# writing to file
f.write("\n Interne of things")
f.close()

file=input("enter Name of file you want to open:")
#file=open("‪Quiz.txt","r")
#a=file.read() # reads whole file
b=file.read(10) # reads 10 letters
c=file.readlines() # reads two lines
#print(a)
#print(b)‪
print(a)
file.close()

enter Name of file you want to open:ashi.txt

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-13-f06ddbf16757> in <module>()
      2 file=input("enter Name of file you want to open:")
      3 #file=open("‪Quiz.txt","r")
----> 4 a=file.read() # reads whole file
      5 #b=file.read(10) # reads five letters
      6 #c=file.readlines(3) # reads two lines
AttributeError: 'str' object has no attribute 'read'

with open("ashi.txt","r") as file:   
    data = file.read()  
print(data)

Data  
with python
Data Handling 
with python

## We can also split lines using file handling in Python. 
#This splits the variable when space is encountered.
with open("python.txt", "r") as file: 
    data = file.readlines() 
    for line in data: 
        word = line.split() 
        print (word )

['Learn', 'Data', 'Science']
['with', 'python']
[]
['Data', 'Visualization']

Ques: Program to count number of lines in a file

with open("ashi.txt" ,"w") as f:
   f.write("HI \nTHis is python\nclasssss\nWelcomeall\nstudy")
#Program to count no. of lines:
with open("ashi.txt") as file:
    for i,l in enumerate(file):#Enumerate means look line by line.
        print(i,l)
    lines=i+1
print("Number of lines in file:",lines)

0 HI 

1 THis is python

2 classsss

3 Welcomeall

4 study
Number of lines in file: 5

Ques: Program to find largest word in a file

#Program to print largest word in file:
with open("ashi.txt") as file:
    words=file.read().split()
    print(words)
    max_len=len(max(words,key=len))
    for word in words:
        if len(word)==max_len:
            print("The longest word in file = %s and its length = %d :"%(word,max_len))

['HI', 'THis', 'is', 'pythonclasssss', 'Welcomeall', 'study']
The longest word in file = pythonclasssss and its length = 14 :

Ques : A Python program to get the file size of a plain file

def file_size(file):
        import os
        statinfo = os.stat(file)
        return statinfo.st_size

print("File size in bytes of a plain file= ",file_size("ashi.txt"))

File size in bytes of a plain file=  48

Program to copy one file to another

from shutil import copyfile
copyfile('ashi.txt', 'abc.txt')

'abc.txt'