Commerce (English Medium) Class 12 - CBSE Important Questions for Computer Science (Python)

What will be the output of the following statement:

print(3-2**2**3+99/11)

Select the correct output of the code:

s = "Python is fun"
l = s.split()
s_new = "_".join([1[0].upper(), 1[1], 1[2].capitalize()])
print(s_new)

• Assertion(A): List is an immutable data type.
• Reasoning(R): When an attempt is made to update the value of an immutable variable, the old variable is destroyed and a new variable is created by the same name in memory.

A list named studentAge stores age of students of a class. Write the Python command to import the required module and (using built-in function) to display the most common age value from the given list.

Given the following dictionaries.

dict_exam={"Exam":"AISSCE", "Year":2023}
dict_result={"Total":500, "Pass_Marks":165}

Which statement will merge the contents of both dictionaries?

Which of the following mode in the file opening statement results or generates an error if the file does not exist?

The correct syntax of seek() is ______

Assertion (A): CSV (Comma Separated Values) is a file format for data storage that looks like a text file.

Reason (R): The information is organized with one record on each line and each field is separated by a comma.

Assertion (A): CSV (Comma Separated Values) is a file format for data storage that looks like a text file.

Reason (R): The information is organized with one record on each line and each field is separated by a comma.

Predict the output of the Python code given below:

tuple1 = (11, 22, 33, 44, 55 ,66)
list1 =list(tuple1)
new_list = []
for i in list1:
 if i%2==0:
 new_list.append(i)
new_tuple = tuple(new_list)
print(new_tuple)

Write a method COUNTLINES() in Python to read lines from the text file ‘TESTFILE.TXT’ and display the lines which do not start with any vowel.

Example:

If the file content is as follows:

An apple a day keeps the doctor away.
We all pray for everyone’s safety.
A marked difference will come in our country.

The COUNTLINES() function should display the output as:

The number of lines not starting with any vowel - 1

Write a function ETCount() in Python, which should read each character of a text file “TESTFILE.TXT” and then count and display the count of occurrence of alphabets E and T individually (including small cases e and t too).

Example:

If the file content is as follows:

Today is a pleasant day.
It might rain today.
It is mentioned on weather sites

The ETCount() function should display the output as:
E or e : 6
T or t : 9

What is the advantage of using a CSV file for permanent storage? Write a Program in Python that defines and calls the following user-defined functions:

1. ADD() - To accept and add data of an employee to a CSV file ‘record.csv’. Each record consists of a list with field elements such as empid, name, and mobile to store an employee id, employee name, and employee salary respectively.
2. COUNTR() - To count the number of records present in the CSV file named ‘record.csv’.

Give any one point of difference between a binary file and a CSV file. Write a Program in Python that defines and calls the following user-defined functions:

1. add() - To accept and add data of an employee to a CSV file ‘furdata.csv’. Each record consists of a list with field elements such as fid, fname, and fprice to store furniture id, furniture name, and furniture price respectively.
2. search() - To display the records of the furniture whose price is more than 10000.

Aman is a Python programmer. He has written a code and created a binary file record.dat with employeeid, ename, and salary. The file contains 10 records.

He now has to update a record based on the employee id entered by the user and update the salary. The updated record is then to be written in the file temp.dat. The records which are not to be updated also have to be written to the file temp.dat. If the employee id is not found, an appropriate message should be displayed.

As a Python expert, help him to complete the following code based on the requirement given above:

import _______ #Statement 1
def update_data():
rec={}
fin=open("record.dat","rb") 
fout=open("_____________") #Statement 2
found=False
eid=int(input("Enter employee id to update their salary :: "))
while True:
try:
rec=______________ #Statement 3
if rec["Employee id"]==eid:
 found=True 
   rec["Salary"]=int(input("Enter new salary :: "))
   pickle.____________ #Statement 4
else:
   pickle.dump(rec,fout)
except:
  break
if found==True:
print("The salary of employee id ",eid," has
been updated.")
else:
print("No employee with such id is not found")
 fin.close()
fout.close()

1. Which module should be imported into the program? (Statement 1)
2. Write the correct statement required to open a temporary file named temp.dat. (Statement 2)
3. Which statement should Aman fill in Statement 3 to read the data from the binary file, record.dat, and in Statement 4 to write the updated data in the file, temp.dat?

Which of the following mode keeps the file offset position at the end of the file?

The syntax of seek() is:
file_object.seek(offset[,reference_point])

What is the default value of reference_point?

Write the definition of a Python function named LongLines() which reads the contents of a text file named 'LINES.TXT' and displays those lines from the file which have at least 10 words in it. For example, if the content of 'LINES.TXT' is as follows: 

Once upon a time, there was a woodcutter
He lived in a little house in a beautiful, green wood.
One day, he was merrily chopping some wood.
He saw a little girl skipping through the woods, whistling happily.
The girl was followed by a big gray wolf. 

Then the function should display output as:

He lived in a little house in a beautiful, green wood.
He saw a little girl skipping through the woods, whistling happily.

Write a function count_Dwords() in Python to count the words ending with a digit in a text file "Details.txt".

Example:
If the file content is as follows:
On seat2 V1P1 will sit and
On seat1 VVIP2 will be sitting
The output will be:
The number of words ending with a digit is 4

Write one difference between CSV and text files.