python 判断类型是否为空

字符串为空判断

	phone = None
    if phone:
        print('true')
    else:
        print('false')
    
    phone = ""
    if not phone:
        print('false')
    else:
        print('true')

打印

false
false

其他常量判断 同理字符串

phone = {}
phone = None
phone = ""
phone = []
phone = 0

这些都是false