Beginning Zeros

Quiz>

You have a string that consist only of digits. 

You need to find how many zero digits ("0") are at the beginning of the given string.

 

Input:

A string, that consist of digits.

 

Output:

An Int.

 

Example:

beginning_zeros('100') == 0
beginning_zeros('001') == 2
beginning_zeros('100100') == 0
beginning_zeros('001001') == 2
beginning_zeros('012345679') == 1
beginning_zeros('0000') == 4

 

Precondition: 

0-9

 

def beginning_zeros(number: str) -> int:
    # your code here
    return 0


if __name__ == '__main__':
    print("Example:")
    print(beginning_zeros('100'))

    # These "asserts" are used for self-checking and not for an auto-testing
    assert beginning_zeros('100') == 0
    assert beginning_zeros('001') == 2
    assert beginning_zeros('100100') == 0
    assert beginning_zeros('001001') == 2
    assert beginning_zeros('012345679') == 1
    assert beginning_zeros('0000') == 4
    print("Coding complete? Click 'Check' to earn cool rewards!")

 

Solve>

1. 초기값 지정

def beginning_zeros(number: str):
    initial_value = 0

 

2. 숫자를 하나씩 가져와서 n이 0이랑 같으면

def beginning_zeros(number: str):
    for n in number:
        if int(n) == 0:

 

3. 초기값 1을 더한다.

def beginning_zeros(number: str):
    for n in number:
        if int(n) == 0:
            initial_value += 1

 

4. 다른 숫자이면 초기값을 반환한다.

def beginning_zeros(number: str):
        else:
            return initial_value

 

5. for문이 종료되면 초기값에 더해진 값을 반환한다.

def beginning_zeros(number: str):
    return initial_value

 

Code>

def beginning_zeros(number: str):
    initial_value = 0
    
    for n in number:
        if int(n) == 0:
            initial_value += 1
        else:
            return initial_value
            
    return initial_value

 

Example>

if __name__ == '__main__':
    print("Example:")
    print(beginning_zeros('100'))

    # These "asserts" are used for self-checking and not for an auto-testing
    assert beginning_zeros('100') == 0
    assert beginning_zeros('001') == 2
    assert beginning_zeros('100100') == 0
    assert beginning_zeros('001001') == 2
    assert beginning_zeros('012345679') == 1
    assert beginning_zeros('0000') == 4
    print("Coding complete? Click 'Check' to earn cool rewards!")

 

Result>

Example:

0

Coding complete? Click 'Check' to earn cool rewards!