Python Input and Output
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Questions and Answers

What is the primary characteristic of strings in Python?

  • They are mutable
  • They can only be created using single quotes
  • They can only be created using double quotes
  • They are immutable (correct)
  • Which of the following operations can be performed on a list?

  • Reverse the list
  • Remove an element at a specific index
  • Change the data type of the list
  • All of the above (correct)
  • What is the purpose of slicing in a list?

  • To delete elements at a specific index
  • To insert elements at a specific index
  • To create a reversed copy of the list
  • To extract a subset of elements from the list (correct)
  • What is the correct way to sort a list in descending order?

    <p>list.sort(reverse=True)</p> Signup and view all the answers

    How do you insert an element at a specific index in a list?

    <p>list.insert(index, element)</p> Signup and view all the answers

    What is the result of concatenating two lists together?

    <p>A new list with all elements from both lists</p> Signup and view all the answers

    What is the purpose of using the 'end' parameter in Python's print function?

    <p>To change the default newline character to a custom character</p> Signup and view all the answers

    What is the default value of the 'end' parameter in Python's print function?

    <p>' '</p> Signup and view all the answers

    What is the purpose of using formatted output in Python?

    <p>To simplify the print statement by using variables inside curly braces</p> Signup and view all the answers

    What is the symbol used to start a comment in Python?

    <h1></h1> Signup and view all the answers

    What is the advantage of using comments in Python code?

    <p>To make the code more readable and understandable</p> Signup and view all the answers

    What is the difference between the two print statements: print('Hello', end=' ') and print('Hello', end='\n')?

    <p>The first one prints 'Hello' on the same line, while the second one prints 'Hello' on a new line</p> Signup and view all the answers

    What is the purpose of a regular expression?

    <p>To match or find other strings or sets of strings</p> Signup and view all the answers

    Which Python package is used to work with regular expressions?

    <p>re</p> Signup and view all the answers

    What does the regular expression pattern \d match?

    <p>Digits</p> Signup and view all the answers

    What is the opposite of the regular expression pattern \w?

    <p>\W</p> Signup and view all the answers

    What is the purpose of the ^ metacharacter in regular expressions?

    <p>Matches the beginning of a line</p> Signup and view all the answers

    What is the output of the following Python program: st = 'Hello World'; print(st.upper())?

    <p>HELLO WORLD</p> Signup and view all the answers

    What happens to the previous data in a file when new data is written to it?

    <p>The previous data gets erased and replaced with the new data</p> Signup and view all the answers

    What method is used to write a single string to a text file?

    <p>write()</p> Signup and view all the answers

    What mode should a file be opened in to append data to it?

    <p>'a' mode</p> Signup and view all the answers

    What does the tell() method do in a file?

    <p>Returns the current position in the file</p> Signup and view all the answers

    What is the purpose of the seek() method in a file?

    <p>To change the current file position</p> Signup and view all the answers

    What is the purpose of the writelines() method?

    <p>To write a list of strings to a file</p> Signup and view all the answers

    What does the seek() method's second argument specify?

    <p>The reference position in the file</p> Signup and view all the answers

    What is the purpose of the tell() method in Python?

    <p>To get the current file position</p> Signup and view all the answers

    What is the result of the following code: os.rename('test1.txt', 'test2.txt')?

    <p>The file 'test1.txt' is renamed to 'test2.txt'</p> Signup and view all the answers

    What is the purpose of the remove() method in Python?

    <p>To delete a file</p> Signup and view all the answers

    What is the purpose of the function input_stats as described in the exercise?

    <p>To report the longest line in the file</p> Signup and view all the answers

    What happens when the seek() method is called with the arguments (0, 0)?

    <p>The file position is moved to the beginning of the file</p> Signup and view all the answers

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