Calculator Example

def calc(input):
    if len(input) == 0:
        return 0
    
    result = 0
    for i in input:
        if i == '/0':
            continue
        operator = i[0:1]
        num = i[1:]
        result = performOperation(result, operator, num)
    return result

def performOperation(currentResult, operator, num):
    num = int(num)
    if operator == '+':
        currentResult += num
    elif operator == '-':
        currentResult -= num
    elif operator == '*':
        currentResult *= num
    elif operator == '/':
        currentResult /= num
    return currentResult

print(calc(['+1', '+1123', '*2', '/3']))
print(calc(['+1', '+1', '*2', '/3']))
print(calc(['+100', '/2', '*2', '-12']))
print(calc(['-100', '/22', '+12', '+15']))
print(calc(['+100', '/3', '-1', '+25', '/0']))
print(calc(['+1']))
print(calc(['/1']))
print(calc([]))