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def isPhoneNumber(text):
    #固定电话
    if len(text) != 13:
        return False  # 位数不够
    for i in range(0, 4):
        if not text[i].isdecimal():
            return False  # 区号不对
    if text[4] != \'-\':
        return False  # 没有分割符号
    for i in range(5, 13):
        if not text[i].isdecimal():
            return False  # 检测电话号码主体是不是数字
    return True  # "text" is a phone number!

print(\'0579-56574828 is a phone number:\')
print(isPhoneNumber(\'0579-56574828\'))
print(\'Moshi moshi is a phone number:\')
print(isPhoneNumber(\'Moshi moshi\'))