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作业

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#1 Created at ... [Delete] [Delete and Lock User]
def safe_base64_decode(s):
    # 先判断长度是不是4的倍数
    if len(s) % 4 != 0:
        # 如果不是,则需要用=补足
        nums = 4 - len(s) % 4
        for i in range(nums + 1):
            s = s + b'='

    return base64.urlsafe_b64decode(s)

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