Practical Python: Learn Python Basics Step by Step- Python 3 - Python Level 4: Exercises - Solution

The video tutorial demonstrates how to create Python files for computing averages and sorting lists. It begins with reading numbers from a file to compute their average, using a function imported from a module. The tutorial then shifts to sorting a list of cities alphabetically, writing the sorted list to a new file. Key programming concepts such as file handling, list manipulation, and function importation are covered.

What is the purpose of using the 'with' keyword when opening a file in Python?

• To lock the file for exclusive access

• To write data to the file

• To read the file in binary mode

• To ensure the file is closed automatically after its suite finishes

Why is it necessary to convert the data read from a file into a float when computing an average?

• To make the data compatible with the 'sorted' function

• To allow for decimal calculations

• To ensure the data is stored as a string

• To enable the use of the 'rstrip' method

What is the purpose of the 'rstrip' method when reading lines from a file?

• To convert the line to lowercase

• To strip the newline character from the end of the line

• To remove leading whitespace from the line

• To split the line into a list of words

What is the benefit of importing a function from a module instead of copying it into your script?

• It reduces the file size

• It prevents syntax errors

• It allows for code reuse and easier maintenance

• It makes the script run faster

What does the 'sorted' function do when applied to a list in Python?

• It removes duplicates from the list

• It reverses the order of the list

• It converts the list to a set

• It sorts the list in ascending order

Why is it important to add a newline character when writing each city to the file?

• To separate each city with a space

• To append the city names to the existing file content

• To ensure each city appears on a new line

• To convert the city names to uppercase

What is a common practice to indicate the end of a Python script?

• Closing all open files

• Returning a value from the main function

• Printing 'Done' or 'OK'

• Printing 'End of Script'