python 判斷數(shù)組、字符串、對(duì)象、字典等是否為空？

字符串為空判斷

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

打印

false
false

其他常量判斷 同理字符串

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

這些都是false