Question

Write a function count_vowels(s) that takes a string as an argument and returns the number of vowels ('a', 'e', 'i' 'o', 'u') in the string. Should you use a for or while loop? (Implement this as a function, not as a class with a method.) Be sure to include unittest test cases to demonstrate that your code works properly, e.g Part 2: last_occurance(target, sequence) Write a function last_occurance(target, sequence) that takes two arguments: 1. target: A target item to find 2. sequence: A list. Your function should return the index (offset from 0) of the last occurrence of the target item or None if the target is not found. E.g. the last occurrence of 33 is at offset 3 in the list [ 42, 33, 21, 33 ] because 42 is offset 0, the first 33 is at offset 1, 21 is offset 2, and the last 33 is offset 3. Use unittest to test your function with several different target values and lists. Next, test your function with a character as the target, and a string as the list, e.g. find('p', 'apple'). What should happen? Be sure to use unittest to demonstrate that your code works properly. You should have the following assumption: 1. If type(sequence) in (list, tuple), the data type of elements in sequence will be the same. And each element’s data type will be the same as target. 2. If type(sequence) is str, the target will be a single charactre. A substr whose length greater than 1 is not requried to be considered.

Answer 1

def count_vowels(s):#method to count and return the number of vowels in a given string
c=0#to store count
for i in s:
if(i=='A' or i=='a' or i=='E' or i=='e' or i=='I' or i=='i' or i=='O' or i=='o' or i=='U' or i=='u'):
c+=1
return c#returning count
def last_occurance(target, sequence):
index=-1#to store the index value
k=0
for i in sequence:
if i==target:#if found then updating index
index=k
k+=1
return index
#testing count_vowels method
s="Hello"
print("Vowels in "+s+":",count_vowels(s))
s="Omg1"
print("Vowels in "+s+":",count_vowels(s))
s="123"
print("Vowels in "+s+":",count_vowels(s))
#testing last_occurance method
#checking with list
t=2
l=[2,1,4,2,5]
print("Last occurence of ",t," in ",l," at index:",last_occurance(t,l))
t=2
l=[1,45]
print("Last occurence of ",t," in ",l," at index:",last_occurance(t,l))
#checking with string
t='l'
l='Hello'
print("Last occurence of ",t," in ",l," at index:",last_occurance(t,l))
t='4'
l='Hello'
print("Last occurence of ",t," in ",l," at index:",last_occurance(t,l))
#checking with tuple
t=2
l=(2,1,4,2,5)
print("Last occurence of ",t," in ",l," at index:",last_occurance(t,l))
t=2
l=(1,45)
print("Last occurence of ",t," in ",l," at index:",last_occurance(t,l))

output:

Vowels in Hello: 2 Vowels in Omgi: 1 Vowels in 123: 0 Last occurence of 2 in 12, 1, 4, 2, 5] at index: 3 Last occurence of 2 in (1, 45] at index: -1 Last occurence of 1 in Hello at index: 3 Last occurence of 4 in Hello at index: -1 Last occurence of 2 in (2, 1, 4, 2, 5) at index: 3 Last occurence of 2 in (1, 45) at index: -1 ... Program finished with exit code 0 Press ENTER to exit console.

3 main.py 1. def count vowels(s) : #method to count and return the number of vowels in a given string C=8#to store count for i in s: if(i=='A' or i=='a' or i= 'E' or i='e' or i=='I' or i=='i' or i=='0' or iz'o' or i=='U' or i=='u'); C+=1 return C#returning count 7. def last_occurance(target, sequence): index=-1&to store the index value ku le 11- 12 for i in sequence: if i==target:#if found then updating index index=k k+=1 return index 15 #testing count_vowels method 16 S="Hello" 17 print("Vowels in "+5+":",count_vowels(s)) 18 S="Omg1" 19 print("Vowels in "+5+":",count_vowels(s)) S="123" 21 print("Vowels in "+5+":",count_vowels(s)) 22 #testing Last_occurance method 23 #checking with List 24 t=2 25 1=(2,1,4,2,5] 26 print("Last occurence of ",t," in ",1," at index:",last_occurance(t,1)) 27 t=2 28 1=[1,45] 29 print("Last occurence of ",t," in ",1," at index: ",last_occurance(t,1)) 30 #checking with string 31 ta'l' 32 l='Hello' 33 print("Last occurence of ",t," in ",1," at index:",last_occurance(t,1)), 34 t='4' 35 l='Hello' 36 print("Last occurence of ",t," in ",1," at index:",last_occurance(t,1)), 37 #checking with tuple 38 t=2 39 1=(2,1,4,2,5) 40 print("Last occurence of ",t," in ",1," at index:",last_occurance(t,1)), 41 t=2 42 1=(1,45) 43 print("Last occurence of ",t," in ",1," at index:",last_occurance(t,1)),