min in list | Python Fiddle

# Return the indexes of the smallest number in the list i.e. 0.5

number_list = [0.5, 1, 3, 10, 100, 2, 3, 0.5, 50]

lowest_value = None

index_list = []

index = 0
smallest_value = None

while index < len(number_list):
    
    current_value = number_list[index]
    
    if (smallest_value == None):
        smallest_value = current_value
    
    # if current value is == smallest value 
    # we have another index we should add
    if (current_value == smallest_value):
        index_list.append(index)
    
    # if the current value is less than the smallest value
    # we have a new smallest value.  We need to clear the index
    # list (because the indexes there don't matter anymore) update
    # the smallest value, and add it's index to the list that we just
    # emptied
    elif (current_value < smallest_value):
        index_list = [index] # or index_list = [] then index_list.append(index)
        smallest_value = current_value
        
        
    # increment our index for the next loop
    index += 1

print(smallest_value) 	# 0.5        
print(index_list)  		# you got it right if the screen shows [0, 7]

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