STRINGS

QUESTION 1 OF 7

Fill in the blanks to complete the is_palindrome function. This function checks if a given string is a palindrome. A palindrome is a string that contains the same letters in the same order, whether the word is read from left to right or right to left. Examples of palindromes are words like kayak and radar, and phrases like "Never Odd or Even". The function should ignore blank spaces and capitalization when checking if the given string is a palindrome. Complete this function to return True if the passed string is a palindrome, False if not. ( Image S1Q1 ) Answer: def is_palindrome(input_string): # Two variables are initialized as string date types using empty # quotes: "reverse_string" to hold the "input_string" in reverse # order and "new_string" to hold the "input_string" minus the # spaces between words, if any are found. new_string = "" reverse_string = "" # Complete the for loop to iterate through each letter of the # "input_string" for letter in input_string: # The if-statement checks if the "letter" is not a space. if letter != " ": # If True, add the "letter" to the end of "new_string" and # to the front of "reverse_string". If False (if a space # is detected), no action is needed. Exit the if-block. new_string = new_string + letter reverse_string = letter + reverse_string # Complete the if-statement to compare the "new_string" to the # "reverse_string". Remember that Python is case-sensitive when # creating the string comparison code. if new_string.lower()==reverse_string.lower(): # If True, the "input_string" contains a palindrome. return True # Otherwise, return False. return False print(is_palindrome("Never Odd orEven")) # Should be True print(is_palindrome("abc")) # Should be False print(is_palindrome("kayak")) # Should be True Woohoo! You're quickly becoming the Python string expert!

QUESTION 2 OF 7

Using the format method, fill in the gaps in the convert_distance function so that it returns the phrase "X miles equals Y km", with Y having only 1 decimal place. For example, convert_distance(12) should return "12 miles equals 19.2 km". ( Image S1Q2 ) Answer: def convert_distance(miles): km = miles * 1.6 result = "{} miles equals {:.1f} km".format(miles,(km)) return result print(convert_distance(12)) # Should be: 12 miles equals 19.2 km print(convert_distance(5.5)) # Should be: 5.5 miles equals 8.8 km print(convert_distance(11)) # Should be: 11 miles equals 17.6 km Congrats! You're getting the hang of formatting strings hooray!

QUESTION 3 OF 7

If we have a string variable named Weather = "Rainfall", which of the following will print the substring "Rain" or all characters before the "f"? Correct. Formatted this way, the substring preceding the character "f", which is indexed by 4, will be printed.

print(Weather[:4])Correct Answer

print(Weather[4:])

print(Weather[1:4])

print(Weather[:"f"])

QUESTION 4 OF 7

Fill in the gaps in the nametag function so that it uses the format method to return first_name and the first initial of last_name followed by a period. For example, nametag("Jane", "Smith") should return "Jane S." ( Image S1Q4 ) Answer: def nametag(first_name, last_name): return("{} {}.".format(first_name, last_name[0])) print(nametag("Jane", "Smith")) # Should display "Jane S." print(nametag("Francesco", "Rinaldi")) # Should display "Francesco R." print(nametag("Jean-Luc", "Grand-Pierre")) # Should display "Jean-Luc G." Great work! You remembered the formatting expression to limit how many characters in a string are displayed.

QUESTION 5 OF 7

The replace_ending function replaces a specified substring at the end of a given sentence with a new substring. If the specified substring does not appear at the end of the given sentence, no action is performed and the original sentence is returned. If there is more than one occurrence of the specified substring in the sentence, only the substring at the end of the sentence is replaced. For example, replace_ending("abcabc", "abc", "xyz") should return abcxyz, not xyzxyz or xyzabc. The string comparison is case-sensitive, so replace_ending("abcabc", "ABC", "xyz") should return abcabc (no changes made). ( Image S1Q5 ) Answer: def replace_ending(sentence, old, new): # Check if the old substring is at the end of the sentence if sentence[-len(old):] == old: # Using i as the slicing index, combine the part # of the sentence up to the matched string at the # end with the new string i = len(sentence) - len(old) new_sentence = sentence[:i] + new return new_sentence # Return the original sentence if there is no match return sentence # Test cases print(replace_ending("It's raining cats and cats", "cats", "dogs")) # Should display "It's raining cats and dogs" print(replace_ending("She sells seashells by the seashore", "seashells", "donuts")) # Should display "She sells seashells by the seashore" print(replace_ending("The weather is nice in May", "may", "april")) # Should display "The weather is nice in May" print(replace_ending("The weather is nice in May", "May", "April")) # Should display "The weather is nice in April" Outstanding! Look at all of the things that you can do with these string commands!

QUESTION 6 OF 7

Try using the index method yourself now! Using the index method, find out the position of "x" in "supercalifragilisticexpialidocious". ( Image S1Q6 ) Answer: word = "supercalifragilisticexpialidocious" print(word.index('x')) Right on! The index method is a very useful way of working with strings, and not having to do the hard work manually.

QUESTION 7 OF 7

Modify the student_grade function using the format method, so that it returns the phrase "X received Y% on the exam". For example, student_grade("Reed", 80) should return "Reed received 80% on the exam". ( Image S1Q7 ) Answer: def student_grade(name, grade): return "{} received {}% on the exam".format(name,grade) print(student_grade("Reed", 80)) print(student_grade("Paige", 92)) print(student_grade("Jesse", 85)) You got it! Your string formatting skills are coming along nicely!

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Fill in the blanks to complete the is_palindrome function. This function checks if a given string is a palindrome. A palindrome is a string that contains the same letters in the same order, whether the word is read from left to right or right to left. Examples of palindromes are words like kayak and radar, and phrases like "Never Odd or Even". The function should ignore blank spaces and capitalization when checking if the given string is a palindrome. Complete this function to return True if the passed string is a palindrome, False if not. ( Image S1Q1 ) Answer: def is_palindrome(input_string): # Two variables are initialized as string date types using empty # quotes: "reverse_string" to hold the "input_string" in reverse # order and "new_string" to hold the "input_string" minus the # spaces between words, if any are found. new_string = "" reverse_string = "" # Complete the for loop to iterate through each letter of the # "input_string" for letter in input_string: # The if-statement checks if the "letter" is not a space. if letter != " ": # If True, add the "letter" to the end of "new_string" and # to the front of "reverse_string". If False (if a space # is detected), no action is needed. Exit the if-block. new_string = new_string + letter reverse_string = letter + reverse_string # Complete the if-statement to compare the "new_string" to the # "reverse_string". Remember that Python is case-sensitive when # creating the string comparison code. if new_string.lower()==reverse_string.lower(): # If True, the "input_string" contains a palindrome. return True # Otherwise, return False. return False print(is_palindrome("Never Odd orEven")) # Should be True print(is_palindrome("abc")) # Should be False print(is_palindrome("kayak")) # Should be True Woohoo! You're quickly becoming the Python string expert!

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