Survey of Business Analytics Lesson 10

Questions and Answers

What is the primary purpose of the open() function?

To close an open file

To create a new file regardless of its existence

To return a file object for reading or writing (correct)

To read the contents of a file into a variable

Which method is used to read the entire contents of a file into a string variable?

read() (correct)

getline()

open()

readline()

What does the split() method return?

A dictionary of values

A single string

A numeric value

A list of strings (correct)

What can be used to handle a file not found error when trying to read a file?

A try block Signup and view all the answers

Which of the following is not a valid method to read from a file?

getline() Signup and view all the answers

When using the split() method without arguments, what character is used as the default delimiter?

Space Signup and view all the answers

If you want to read all lines from a file and store them in a list, which method would you use?

readlines() Signup and view all the answers

What is the output of the split() method when applied to the string 'hello world' with a space as the argument?

['hello', 'world'] Signup and view all the answers

What will the readline() method return when there is no more data to read from a file?

An empty string Signup and view all the answers

Which function can be used in a for statement to loop over and read each line of a file?

open() Signup and view all the answers

Which of the following functions can be used to write data to a file? (Select all that apply)

print() Signup and view all the answers

Which statement is true regarding the open() function in Python?

It connects a variable with a file to read its content. Signup and view all the answers

What is the limitation of the string split() method concerning delimiters?

It exclusively recognizes the comma as a delimiter. Signup and view all the answers

Study Notes

File Handling in Python

open() function: Used to open files for both reading and writing but does not read file contents directly.
File object creation: The open() function creates a file object which can be further utilized to read contents using methods like read() and readline().

String Manipulation

split() method: Returns a list of strings resulting from splitting the original string based on specified delimiter(s), not a single string.

File Reading Techniques

Reading a line: readline() is specifically used to read a single line from a file into a string variable.
Looping through file lines: The result of the open function can be integrated into a for loop to process each line iteratively.

Error Handling

try-except blocks: Essential for detecting and managing file-related errors, such as file not found, improving code robustness.

Behavior of File Reading Methods

Empty string return: The readline() method yields an empty string when the end of the file is reached, indicating no more data is available.

Writing Data to Files

write() and print() methods: Functions such as write() and print() can be used to output or save data directly to files.

Understanding Delimiters

split() and delimiters: The string split() method is versatile and recognizes multiple delimiters, not limited to just commas.

Description

Test your understanding of reading and writing files in business analytics with this quiz. It includes 11 questions designed to assess your grasp of file operations and their applications in analytics. Prepare for your assessment by reviewing key concepts before the due date.