Question 1

Question 1Assertion. Python is said to have broadly two types of files - binary and text files, even when there are CSV and TSV files also.Reason. The CSV and TSV are types of delimited text files only where the delimiters are comma and tab respectively.

Accepted Answer

(a)Both Assertion and Reason are true and Reason is the correct explanation of Assertion.ExplanationPython categorize files broadly into two types: binary files and text files.Binary files — These files store the information in the form of a stream of bytes.Text files — These files store the information in the form of a stream of ASCII or Unicode characters.Text files include CSV (Comma-Separated Values) and TSV (Tab-Separated Values) files because they contain human-readable text data and are specific types of delimited text files. In CSV files, fields are separated by commas, while in TSV files, fields are separated by tabs.

Question 2

Question 2Assertion. The file modes "r", "w", "a" work with text files, CSV files and TSV files alike.Reason. The CSV and TSV are types of delimited text files only.

Accepted Answer

(a)Both Assertion and Reason are true and Reason is the correct explanation of Assertion.ExplanationThe file modes "r", "w", and "a" are used to specify the type of operations that can be performed on files in Python. These modes are commonly used with text files, CSV files, and TSV files alike because all of these file types contain human-readable text data. CSV (Comma-Separated Values) and TSV (Tab-Separated Values) are types of delimited text files.

Question 3

Question 3Assertion. The file modes "r", "w", "a" also reveal the type of file these are being used with.Reason. The binary file modes have 'b' suffix with regular file modes.

Accepted Answer

(a)Both Assertion and Reason are true and Reason is the correct explanation of Assertion.ExplanationWhen we see file modes like "r", "w", or "a" being used in code, it often implies operations on text files. These modes are commonly associated with reading from, writing to, or appending text data in files. In Python, binary file modes are distinguished from text file modes by appending 'b' suffix to the regular file modes. For example, 'rb', 'wb', 'ab'. The presence of the 'b' suffix indicates that the file is being opened in binary mode, suggesting operations involving binary data.

Question 4

Question 4Assertion. 'Pickling' is the process whereby a Python object hierarchy is converted into a byte-stream.Reason. A binary file works with byte-streams.

Accepted Answer

(b)Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.ExplanationA binary file works with byte-streams and 'Pickling' is the process in binary file, where a Python object hierarchy is converted into a byte-stream. Binary files are commonly used as the destination for pickled data. This is because binary files can efficiently store raw binary data, including the byte-streams produced by pickling.

Question 5

Question 5Assertion. 'Pickling' is the process whereby a Python object hierarchy is converted into a byte-stream.Reason. Pickling process is used to work with binary files as a binary file works with byte-streams.

Accepted Answer

(b)Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.Explanation"Pickling" is the process whereby a Python object hierarchy is converted into a byte-stream. Pickling process is used to work with binary files as a binary file works with byte-streams. This is because binary files can efficiently store raw binary data, including the byte-streams produced by pickling. The use of binary files is just one of the many possible applications of pickling, but not the primary reason for its existence.

Question 6

Question 6Assertion. Every open file maintains a file-pointer and keeps track of its position after every operation.Reason. Every read and write operation takes place at the current position of the file pointer.

Accepted Answer

(a)Both Assertion and Reason are true and Reason is the correct explanation of Assertion.ExplanationEvery open file maintains a file-pointer, which keeps track of the current position within the file. This file-pointer indicates the location in the file where the next read or write operation will occur. Every read and write operation takes place at the current position of the file pointer. When we perform a read operation, data is read from the file starting at the current position of the file pointer. Similarly, when we perform a write operation, data is written to the file starting at the current position of the file pointer. After each operation, the file pointer is automatically updated to reflect the new position in the file.

Question 7

Question 7Assertion. CSV (Comma Separated Values) is a file format for data storage which looks like a text file.Reason. The information is organized with one record on each line and each field is separated by comma.

Accepted Answer

(a)Both Assertion and Reason are true and Reason is the correct explanation of Assertion.ExplanationCSV (Comma Separated Values) is indeed a file format for data storage that resembles a text file. CSV files are plain text files that typically use the .csv extension and contain tabular data organized into rows and columns. The information in CSV files is organized with one record (or row) on each line, and each field (or column) within a record is separated by a comma.

Question 8

Question 1In which of the following file modes, the existing data of file will not be lost ?'rb'abww + b'a + b'wbwb+w+r+

Accepted Answer

'rb', ab, a + b, r+Reason —'rb' — This mode opens the file for reading in binary mode. It will not erase the existing data and allows reading of the file.'ab' — This mode opens the file for appending in binary mode. It will not erase the existing data but will append new data to the end of the file.'a + b' — This mode opens the file for reading and appending. It will not erase the existing data and allows both reading from and appending to the file.'r+' — This mode opens the file for reading and writing. It will not erase the existing data and allows both reading from and writing to the file.

Question 9

Question 2What would be the data type of variable data in following statements ?data = f.read()data = f.read(10)data = f.readline()data = f.readlines()

Accepted Answer

data = f.read() — Variable data will be string data type.data = f.read(10) — Variable data will be string data type.data = f.readline() — Variable data will be string data type.data = f.readlines() — Variable data will be list data type.

Question 10

Question 3How are following statements different ?f.readline()f.readline().rstrip()f.readline().strip()f.readline.rstrip('
')

Accepted Answer

f.readline() — This statement reads a single line from the file f and returns it as a string, including any whitespace characters at the end of the line.f.readline().rstrip() — This statement first reads a single line from the file f, then applies the rstrip() method to remove any trailing whitespace from the end of the line, and returns the modified line as a string.f.readline().strip() — This statement first reads a single line from the file f, then applies the strip() method to remove any leading and trailing whitespace from the start and end of the line, and returns the modified line as a string.f.readline.rstrip('
') — This is not a valid syntax. The correct syntax is f.readline().rstrip('
'). This statement first reads a single line from the file f, removes any trailing newline characters from the end of the line, and returns the modified line as a string.

Question 11

Question 1What are text files ?

Accepted Answer

A text file stores information in ASCII or Unicode characters, where each line of text is terminated, (delimited) with a special character known as EOL (End of line) character. In text files some internal manipulations take place when this EOL character is read and written.

Question 12

Question 2What are binary files ?

Accepted Answer

A binary file stores the information in form of a stream of bytes. A binary file is just a file that contains information in the same format in which the information is held in memory, i.e., the file content that is returned to us is raw (with no translation or no specific encoding).

Question 13

Question 3What are CSV files ?

Accepted Answer

CSV (Comma Separated Values) files are delimited files that store tabular data (data stored in rows and columns as we see in spreadsheets or databases) where comma delimits every value. Each line in a CSV file is a data record. Each record consists of one or more fields, separated by commas (or the chosen delimiter).

Question 14

Question 4Name the functions used to read and write in plain text files.

Accepted Answer

The functions used to read in plain text files are as follows :read()readline()readlines()The functions used to write in plain text files are as follows :write()writelines()

Question 15

Question 5Name the functions used to read and write in binary files.

Accepted Answer

The functions used to read and write in binary files are load() and dump() functions of pickle module respectively.

Question 16

Question 6Name the functions used to read and write in CSV files.

Accepted Answer

The functions used to read in CSV files are as follows :csv.reader()The functions used to write in CSV files are as follows :csv.writer().writerow().writerows()

Question 17

Question 7What is the full form of :CSVTSV

Accepted Answer

CSV — Comma Separated ValuesTSV — Tab Separated Values

Question 18

Question 1The default file-open mode is read mode.

Accepted Answer

Please refer to the full solution above.

Question 19

Question 2A file mode governs the type of operations (e.g., read/write/append) possible in the opened file.

Accepted Answer

Please refer to the full solution above.

Question 20

Question 3The two types of data files can be text files and binary files.

Accepted Answer

Please refer to the full solution above.

File Handling

Assertions And Reasons

Checkpoint 51

Checkpoint 52

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Multiple Choice Questions

Truefalse Questions

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