SQL == Sales, promotions, products DB I was able to complete only 3 questions.
Python == solved only 3 questions.
find giving letter in a string
Replace None with previous element from List, there was some challenges
[None]
[None,1,2] == [None,1,2]
[1,None,2] == [1,2,2]
[1,4,None,None,3]=== [1,4,4,4,3]
Forgot one question

In the SQL part, please make sure you learn how to calculate %

Question

SQL ==>  Sales, promotions, products DB I was able to complete only 3 questions. 
Python ==>  solved only 3 questions.
find giving letter in a string
Replace None with previous element from List, there was some challenges
[None]
[None,1,2] ==> [None,1,2]
[1,None,2] ==> [1,2,2]
[1,4,None,None,3]===> [1,4,4,4,3]
Forgot one question

In the SQL part, please make sure you learn how to calculate %

Error in the statement · Accepted Answer

False : [1,None,2] ==> [1,2,2]
True : [1,None,2] ==> [1,1,2]

rcKahuna · Answer

def fillNone(l):
    prev = None
    for i, n in enumerate(l):
        if n is None:
            l[i] = prev
        else:
            prev = l[i]
    return l

CodeOromiya · Answer

def rep(ls):
    index = 0
    temp = None
    if len(ls) == 1 and ls[0] is None:
        return ls
    if ls[0] == None:
        index = index + 1
    print(index)
    for i in range(index,len(ls)-1):
        if ls[i] == None:
            temp = ls[i-1]
            print(temp)
        if ls[i] is None:
            ls[i] = temp
    return ls

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