Make the Deadfish Swim

DESCRIPTION:

Write a simple parser that will parse and run Deadfish.

Deadfish has 4 commands, each 1 character long:

• i increments the value (initially 0)
• d decrements the value
• s squares the value
• o outputs the value into the return array

Invalid characters should be ignored.

parse("iiisdoso")  ==>  [8, 64]

---

def parse(data):
    alist=[]
    ans=0
    for i in data:
        if i=="i":
            ans+=1
        elif i=="d":
            ans-=1
        elif i=="s":
            ans=ans*ans
        elif i=="o":
            alist.append(ans)
    return alist