Function revstring

Stack.py:38–46

(mystr)

# 利用栈将字串的字符反转
def revstring(mystr):
    # your code here
    s = Stack()
    outputStr = ''
    for c in mystr:
        s.push(c)
    while not s.isEmpty():
        outputStr += s.pop()
    return outputStr

# print(revstring('apple'))
# print(revstring('x'))