Mixed-up code Questions

Section 6.10 Mixed-up code Questions

Checkpoint 6.10.1.

Create the function, countup_str(start), to return a string with the numbers from 1 to end. For example, countup_str(5) would return "12345".

def countup_str(end):
---
    out = ""
---
    for i in range(1, end + 1):
---
    for i in range(1, end):  #paired
---
        out = out + str(i)
---
        out = out + i  #paired
---
    return out

Checkpoint 6.10.2.

Create the function, reverse(s), to return a string with the characters in the string s reversed. For example, reverse("Hello") would return "olleH".

def reverse(s):
---
    out = ""
---
    for i in range(len(s) - 1, -1, -1):
---
    for i in range(len(s), -1, -1):  #paired
---
        out = out + s[i]
---
        out = s[i] + out  #paired
---
    return out

Checkpoint 6.10.3.

Create the function, countdown_str(start), to return a string with the numbers from start to 0. For example, countdown_str(5) would return "543210".

def countdown_str(start):
---
    out = ""
---
    for i in range(start, -1, -1):
---
    for i in range(start, 0, -1):  #paired
---
        out = out + str(i)
---
        out = out + i  #paired
---
    return out

Checkpoint 6.10.4.

Create the function, odd_sum(start, increment, end), to return the sum of all of the odd numbers between start (inclusive) and end (exclusive) using a range with increment. For example, if start is 1, increment is 2, and end is 6, the returned sum should be (1 + 3 + 5) which is 9.

def odd_sum(start, increment, end):
---
    sum = 0
---
    for number in range(start, end, increment):
---
    for numbers in range(start, increment, end):  #paired
---
        sum = sum + number
---
    return sum

Checkpoint 6.10.5.

Create the function, sum_of_range(start, end), to return the sum of all numbers between the start and end inclusive. For example, if start is 0 and end is 5, the returned sum should be (0 + 1 + 2 + 3 + 4 + 5) which is 15.

def sum_of_range(start, end):
---
    sum = 0
---
    for number in range(start, end):
---
        sum = sum + number
---
        sum = sum + numbers  #paired
---
    return(sum)

Checkpoint 6.10.6.

Create the function, count_vowels(s), to return a count of the vowels (aeiou) in the string s. For example, count_vowels("careful") would return 3.

def count_vowels(s):
---
    count = 0
    vowels = "aeiou"
---
    for ch in s:
---
        if ch in vowels:
---
        if s in vowels:  #paired
---
            count += 1
---
    return count
---
    return Count  #paired

Checkpoint 6.10.7.

Create the function, copy_till_gt_value(s,value), to return a copy of the string s with all the digits in the string until it finds a digit greater than the passed value. For example, copy_till_gt_value("1357", 5) would return “135”.

def copy_till_gt_value(s, value):
---
    out = ""
    i = 0
    while i < len(s):
---
        ch = s[i]
---
        ch = s(i)  #paired
---
        int_ch = int(ch)
---
        int_ch = integer(ch)  #paired
---
        if int_ch > value:
---
        if int_ch >= value:  #paired
---
            return out
---
        out += ch
---
        i += 1
---
    return out

Checkpoint 6.10.8.

Create the function, count_last2(s), to return a count of the number of times the last two characters appears in the string s. If there are less than 2 characters in s return 0. For example, count_last2("hixxhi") returns 2, count_last2("axxxaaxx") returns 3, and count_last2('x') returns 0.

def count_last2(s):
---
    if  len(s) < 2:
---
        return 0
---
    count = 0
    last2 = s[-2:]
---
    for i in range(len(s)):
---
        curr = s[i:i+2]
---
        curr = s[i:i+1]  #paired
---
        if curr == last2
---
        if curr = last2  #paired
---
            count += 1
---
    return count

Checkpoint 6.10.9.

Create the function, list_to_5(n), so that while the integer n is less than 5, add n to a list to return and increment n by 1. Then return the list. For example, if n is 0, then the function should return [0, 1, 2, 3, 4].

def list_to_5(n):
---
    list = []
---
    while n < 5:
---
    while n > 5:  #paired
---
        list.append(n)
---
        n += 1
---
    return list

Checkpoint 6.10.10.

Create the function, water_quality(pHvalues), to return a float for the average pH of water samples in the list pHvalues. For example, if pHvalues is [7.0, 8.2, 6.7, 7.5, 8.0, 7.2], then the function should return 7.433333333333334.

def water_quality(pHvalues):
---
    total = 0
---
    for number in pHvalues:
---
        total = total + number
---
        total = total * number  #paired
---
    average = total / len(pHvalues)
---
    return average

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