Def second_index(a_list, number): Accepts a list of integers and an integer, and returns the index of...

Code with explanation:

def second_index(a_list,number):
#list of all occurance
lst=[i for i, n in enumerate(a_list) if n == number ]
if len(lst)>1:
return lst[1]
else:
return None
  
print(second_index([2,34,3,45,34,45,3,3],3))
print(second_index([2,34,3,45,34,45,3,3],45))
print(second_index([2,34,3,45,134,45,3,3],134))
print(second_index([2,34,3,45,134,45,3,3],100))

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screenshot of output with code:

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Code with explanation:

def hasEveryLetter(s):
for x in s:
#check if the letter is lower
if x.islower():
#count the number of occurance of each letter
#in given string
cnt=[i for i, n in enumerate(s) if n == x]
#if occurance is greater than 1
#return False
if(len(cnt)>1):
return False
return True

print(hasEveryLetter("Apple"))
print(hasEveryLetter("aPPle"))
print(hasEveryLetter("bankruptcy"))
print(hasEveryLetter("Demography"))

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screenshot of output with code: