Проект: мини-банк

API

class Bank:
    def __init__(self): self.accs = {}
    def open(self, name): self.accs[name] = 0
    def deposit(self, name, x): self.accs[name] += x
    def transfer(self, a, b, x):
        self.accs[a] -= x; self.accs[b] += x