File Handling

Question 1

Which import is required?

Answer 1

import os

Question 2

How to open a file?

Answer 2

f = open(‘logs.dat’, ‘r’)

Question 3

What are these operators for?
‘r’
‘w’
‘a’
‘r+’
‘b’
‘t’

Answer 3

read-only mode
write-only mode
appending mode, write-only
opened for reading/writing
binary mode
text mode

Question 4

How to read all lines of a file?

Answer 4

f = open(‘logs.txt’, ‘r’)
lines = f.readlines()
while i <= len(lines):
do something…
f.close()

Question 5

How to write to a file?

Answer 5

f = open(‘logs.txt’, ‘w’)

f. write(“This is a text”)
f. close()

Question 6

What’s the difference between write & writelines?

Answer 6

• writelines expects an iterable of strings
• write expects a single string

Question 7

How to copy a file using a python function?

Answer 7

import shutil
shutil.copy(oldfile, newfile)

Question 8

How to copy a file using a standard code?

Answer 8

fin = open(oldfile,'r')
fout = open(newfile,'w')

aList = fin.readlines()
for line in aList:
fout.write(line)

fin. close()
fout. close()