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12th CS Python July Monthly-2019 Test Blue print

Total= 35 marks                  Duration: 1Hour 30minutes Date: 26-07-2019

Chapter-03 File Handling in Python: 10 marks

Chapter-04 Python Libraries: 10 marks

Chapter-05 Recursion in Python: 10 marks

Chapter-06 Idea of  Efficiency: 05 marks

Details:

Chapter-03 File Handling in Python: 10 marks

1. Program writing  for the content of the file   -2 marks

2. Program writing  for the content of the file  -2 marks

3. Output finding        -3 marks

4.  Program writing    -3 marks

Chapter-04 Python Libraries: 10 marks

5. Output finding     -3 marks
6. Direct question    -2 marks
7. Writing program  - 2 marks
8. Program writing through function - 3 marks

Chapter-05 Recursion in Python: 10 marks

9.  Output finding for recursive program -2 marks
10. function writing through recursive: factorial/Fibonacci/binary search   -4 marks
11. Output finding for recursive program -2 marks
12. Filling the blanks for written programming.   -2 marks

 Chapter-06 Idea of  Efficiency: 05 marks

13. Efficiency calculating with the help of order.     -3 marks

14. run time calculate efficiency  -2 marks 

Library : It is a collection of modules

A module is a file containing Python definitions and statements. The file name is the module name with the suffix .py appended.

Replace function

# Python3 program to demonstrate the  # use of replace()7 method      string = "geeks for geeks geeks geeks geeks"      # Prints the string by replacing geeks by Geeks  print(string.replace("geeks", "Geeks"))     # Prints the string by replacing only 3 occurence of Geeks   print(string.replace("geeks", "GeeksforGeeks", 3))

5Output :

Geeks for Geeks Geeks Geeks Geeks
GeeksforGeeks for GeeksforGeeks GeeksforGeeks geeks geeks

#m1
def cha(a):
    c=[x*2 for x in a]
    print(c)
#m2
 def ch(a):
    c=[x*x for x in a]
    print(c)
from m1 import cha
from m2 import cha
#main
p=[3,4,5]

12th notes

 how to read last n lines from file using Python 3 programming language. The last n lines means, last 5 lines or last 10 lines etc. So n can be replaced by any positive integer value.

Generally we read file from the beginning but sometimes for our business requirements we may need to read a file from the end. So we may need to read file from end using any technology. Here I will show you how to read last n lines from file using Python.

We define a function called tail that takes three arguments – file name, number of lines to read from the end and block size in bytes.

The first argument, file name, is mandatory and others two are optional because we have provided default values for them.

import sys import os def file_read_from_tail(fname,lines): bufsize = 8192 fsize = os.stat(fname).st_size iter = 0 with open(fname) as f: if bufsize > fsize: bufsize = fsize-1 data = [] while True: iter +=1 f.seek(fsize-bufsize*iter) data.extend(f.readlines()) if len(data) >= lines or f.tell() == 0: print(''.join(data[-lines:])) break file_read_from_tail('test.txt',5)

In the above tail function, we use Python’s built-in seek function that has the following features:

seek() sets the file’s current position at the offset. The whence argument is optional and defaults to 0, which means absolute file positioning, other values are 1 which means seek relative to the current position and 2 means seek relative to the file’s end. There is no return value.

The below line when calls the tail function prints the following output:

lines = tail("SampleTextFile_10kb.txt", 5)
for line in lines:
 print (line)

Output:

In the above output we get five lines because we wanted to print last 5 lines.