Write Code Questions Orig

Activity 9.21.1.

Write a function item_lister that takes in a list of at least three values, items, as a parameter. Set the first value to “First item”, set the second value to the original first value, and set the third value to its current value plus one (rounded to two decimals). (Note: the third value of items will only be numerical.) Then, return the modified list. For example, itemLister([2,4,6.222,8]) would return ['First item', 2, 7.22, 8].

Activity 9.21.2.

Create a function item_lister that takes in a list of at least three values, items, as a parameter. Set the first value to “First item”, set the second value to the original first value, and set the third value to its current value plus one (rounded to two decimals). (Note: the third value of items will only be numerical.) Then, return the modified list. For example, itemLister([2,4,6.222,8]) would return ['First item', 2, 7.22, 8].

def itemLister(items):
---
    new_list = []
---
    new_list.append("First item")
---
    new_list.append(items[0])
---
    new_list.append(new_list[0])  #paired
---
    new_list.append(round(items[2] + 1, 2))
---
    for item in items[3:]:
---
        new_list.append(item)
---
    return new_list

Activity 9.21.3.

Write the function change_index3 that takes in one parameter, lst, and assigns the value at index 3 of lst to ‘200’ and then returns lst. For example, change_index3(['hi', 'goodbye', 'python', '106', '506']) would return ['hi', 'goodbye', 'python', '200', '506'] and change_index3([1, 2, 0, -5, 4]) would return [1, 2, 0, '200', 4].

Activity 9.21.4.

Create the function change_index3 that takes in one parameter, lst, and assigns the value at index 3 of lst to ‘200’ and then returns lst. For example, change_index3(['hi', 'goodbye', 'python', '106', '506']) would return ['hi', 'goodbye', 'python', '200', '506'] and change_index3([1, 2, 0, -5, 4]) would return [1, 2, 0, '200', 4].

def change_index3(lst):
---
    lst[3] = '200'
---
    lst[3] = 200  #paired
---
    return lst

Activity 9.21.5.

Write a function countWords that takes in a list, lst, as a parameter, and returns the amount of words that have a length of 5. For example, countWords(['hello', 'hi', 'good morning', 'three', 'kitty']) should return 3.

Activity 9.21.6.

Create a function countWords that takes in a list, lst, as a parameter, and returns the amount of words that have a length of 5. For example, countWords(['hello', 'hi', 'good morning', 'three', 'kitty'] should return 3.

def countWords(lst):
---
    count = 0
---
    for item in lst:
---
    for item in lst[]:  #paired
---
        if len(item) == 5:
---
            count += 1
---
    return count

Activity 9.21.7.

Write a function reverse that takes in one parameter, lst, and returns the reverse of a passed list. For example, reverse([1,2,3]) should return [3, 2, 1].

Activity 9.21.8.

Create a function reverse that takes in one parameter, lst, and returns the reverse of a passed list. For example, reverse([1,2,3]) should return [3, 2, 1].

def reverse(lst):
---
    lst.reverse()
---
    return lst.reverse()  #paired
---
    return lst

Activity 9.21.9.

Write a function sort_by_length that takes in one parameter, a list of strings, lst, and returns the list sorted by the length of the strings. For example, sort_by_length(["hello", "hi", "hey", "greetings"]) would return ['hi', 'hey', 'hello', 'greetings'].

Activity 9.21.10.

Arrange the blocks to define a function sort_by_length that takes in one parameter, a list of strings, lst, and returns the list sorted by the length of the strings. For example, sort_by_length(["hello", "hi", "hey", "greetings"]) would return ['hi', 'hey', 'hello', 'greetings'].

def sort_by_length(lst):
---
    lst.sort(key=len)
---
    return lst

Activity 9.21.11.

Arrange the blocks to define a function add_to_new_list that takes in a list of strings, lst, and creates a new list with the length of lst and the first element of lst three times. For example, add_to_new_list(["1","2","3"]) would return [3, '111'].

def add_to_new_list(lst):
---
    new_list = []
---
    new_list.append(len(lst))
---
    new_list.append(len(new_list)) #paired
---
    new_list.append(lst[0] * 3)
---
    new_list.append(lst[0] + 3) #paired
---
    return new_list

Activity 9.21.12.

Arrange the blocks to define a function average that takes in a list of integers, aList, and returns the average of all of the integers, rounded to one decimal place. For example, average([99, 100, 74, 63, 100, 100]) would return 89.3.

def average(aList):
---
    total = 0
---
    for num in aList:
---
    for num in aList #paired
---
        total += num
---
    avg = round(total / len(aList), 1)
---
    avg = round(total / len(total), 1) #paired
---
    return avg

Activity 9.21.13.

Arrange the blocks to define a function capitalize that takes in a list of lists of strings, lst, and makes the first letter of each element capitalized and adds it to a new list, then returns that new list. For example, capitalize([["hi"],["hello", "hey"]]) would return ['Hi', 'Hello', 'Hey'].

def capitalize(lst):
---
    new_list = []
---
    for sublist in lst:
---
    for sublist in lst[0]: #paired
---
        for word in sublist:
---
            new_list.append(word.capitalize())
---
            new_list.append(word.upper()) #paired
---
    return new_list

Activity 9.21.14.

Arrange the blocks to define a function chop that takes a list, lst, and modifies it, removing the first and last elements. For example, chop([1,2,3,4,5]) should return [2,3,4].

def chop(lst):
---
    lst.pop(0)
---
    lst.pop(1) #paired
---
    lst.pop(-1)
---
    lst.pop(len(lst)) #paired
---
    return lst

Activity 9.21.15.

Arrange the blocks to define a function sumUntilEven that takes in one parameter, lst, and returns the sum of all the elements in the lst up to but not including the first even number. For example, sumUntilEven([1,2,3,4,5]) should return 1 and sumUntilEven([1,3,5,7,9]) should return 25.

def sumUntilEven(lst):
---
    total = 0
    index = 0
---
    while index < len(lst) and lst[index] % 2 != 0:
---
    while index < len(lst) and lst[index] % 2 == 0: #paired
---
        total += lst[index]
---
        index += 1
---
        total += 1 #paired
---
    return total

Activity 9.21.16.

Arrange the blocks to define a function combine(names, ages) that takes in two lists, names and ages, and returns a list of strings in the format "Name: name, age: age". For example, combine(["Claire", "Jennifer"],[23, 19]) would return ["Name: Claire, age: 23", "Name: Jennifer, age: 19"].

def combine(names, ages):
---
    result = []
---
    for i in range(len(names)):
---
    for i in range(len(names) - 1): #paired
---
        result.append("Name: " + names[i] + ", age: " + str(ages[i]))
---
        result.append("Name: " + names[i] + ", age: " + ages[i]) #paired
---
    return result

Section 9.21 Write Code Questions Orig