Question

如果我的词典中某个键的值确实满足条件，我想跳出循环并将属性设置为True。

我到目前为止所做的是：

fooBar = False
for key, value in my_dict.items():
    if (condition):
        fooBar = True

我是否需要使用for循环并遍历字典中的所有项目，还是可以使用while循环？

Answer 1

您不必继续遍历整个字典 - 您可以break离开循环：

fooBar = False
for key, value in my_dict.items():
    if (condition):
        fooBar = True
        break # Here!

Answer 2

在像这样的线性搜索的情况下，循环＆amp;打破旗帜是一种经典的技术。将while保留到无法预测循环何时结束的情况。

然而，比设置标志更加pythonic方法（就像我们在Java或C中必须做的那样）将else用于for循环。

for key, value in my_dict.items():
    if condition:
        break
else:
   # here we know that the loop went to the end without a break

但是，只需要我的2美分：迭代字典应该没有中断来处理所有项目。潜在的break意味着在某个地方进行线性搜索，如果数据组织得更好，可能会更快（例如将值存储为其他字典的键，具体取决于您所查找的内容，因此查找速度更快）

Answer 3

pythonic变体将使用any：

any(condition for k, v in my_dict.items())

例如，如果您想检查是否有一对(key, value)的总和大于10：

>>> my_dict = {1: 4, 5: 6}
>>> any(k + v > 10 for k, v in my_dict.items())
True
>>> any(k + v > 100 for k, v in my_dict.items())
False

如文档中所述，any相当于：

def any(iterable):
    for element in iterable:
        if element:
            return True
    return False

非常看起来像是作为函数编写的代码。

Answer 4

print（“这是一本字典”） Dict = {“ abase”：“降低位置，估计等；降低。” ，

“修道院”：“女修道院的上级夫人。” ，

“修道院”：“这些建筑物共同构成了僧侣或修女社会的住所。” ，

“住持”：“僧侣社区的上级。” ，

“ abdicate”：“要放弃（皇族力量等）。”

“腹部”：“在哺乳动物中，隔膜和骨盆底之间的内脏腔；腹部。” ，

“腹部”：“属于，关于腹部或位于腹部。” ，

“绑架”：“违背或非法将某人带走。” ，

“ abed”：“在床上；在床上。”，

“ append”：“将某些东西连接到最后”， “ accuracy”：“精确度”。

“准确”：“完全符合真理或标准。”，

“被诅咒”：“沦为邪恶，痛苦或不幸的人。”，

“ accustom”：“通过使用使其熟悉。”，

“ acerbity”：“酸，带有苦涩味。”，

“乙酸盐”：“乙酸盐。”，

“ acetic”：“醋的，关于醋的或与醋有关的。”，

“疼痛”：“要痛苦或痛苦。”，

“ achillean”：“无敌”，

“消色差”：“无色”，

“酸”：“一种酸性物质”。

“酸化”：“要变成酸。”，

“致谢”：“承认；承认其真实性或有效性。”，

“确认”：“识别”。

“ acme”：“最高点或最高点。”，

“声音”：“与行为或听觉有关。”，

“相识”：“使人熟悉或交谈。”，

“默认”：“遵守；提交。”，

“默认”：“被动同意”。

“ acquire”：“获得独立。”，

“获取”：“通常通过努力或劳动获得的任何东西或自己创造的东西。”，

“无罪”：“从指控中释放或清除。”，

“无罪释放”：“通过司法诉讼免于指控。”，

“无罪”：“解除或解除债务，义务或责任。”，

“英亩”：“土地，特别是耕地的数量或范围。”，

“ acrid”：“辛辣或苦涩。”，

“ acrimonious”：“充满痛苦”。，

“ acrimony”：“言语或脾气的尖锐或苦涩。” ，

“ actionable”：“冒充冒犯诽谤性言辞的行为的败笔。”，

“事实”：“任何现实。”}

X =（input（“如果您想搜索任何单词，请执行\ n”））如果X不在Dict中： exit（“您的单词不在词典中”）如果X在Dict中：打印（Dict [X]）而（True）： X =（input（“（如果您想搜索任何单词，请执行\ n”））如果X在Dict中：打印（Dict [X]）如果X不在Dict中：打印（“您的单词不在词典中”）打破 ****＃在任何您想复制我的代码的地方运行它，它对我来说效果很好，它是使用while循环制作的，请随时使用它

Answer 5

print("It is a dictionary")
Dict = {"abase" : "To lower in position, estimation, or the like; degrade." ,

"abbess" : "The lady superior of a nunnery." ,

"abbey" : "The group of buildings which collectively form the dwelling-place of a society of monks or nuns." ,

"abbot" : "The superior of a community of monks." ,

"abdicate" : "To give up (royal power or the like).",

"abdomen" : "In mammals, the visceral cavity between the diaphragm and the pelvic floor;the belly." ,

"abdominal": "Of, pertaining to, or situated on the abdomen." ,

"abduction" : "A carrying away of a person against his will, or illegally." ,

"abed" :"In bed; on a bed.",

"append":"To join something to the end",
"accuracy" :  "Exactness.",

"accurate" : "Conforming exactly to truth or to a standard.",

"accursed" :  "Doomed to evil, misery, or misfortune.",

"accustom": "To make familiar by use.",

"acerbity" : "Sourness, with bitterness and astringency.",

"acetate" : "A salt of acetic acid.",

"acetic" : "Of, pertaining to, or of the nature of vinegar.",

"ache": "To be in pain or distress.",

"achillean" : "Invulnerable",

"achromatic" : "Colorless",

"acid" : "A sour substance.",

"acidify" : "To change into acid.",

"acknowledge":  "To recognize; to admit the genuineness or validity of.",

"acknowledgment":"Recognition.",

"acme" : "The highest point, or summit.",

"acoustic" : "Pertaining to the act or sense of hearing.",

"acquaint" : "To make familiar or conversant.",

"acquiesce" : "To comply; submit.",

"acquiescence" : "Passive consent.",

"acquire" : "To get as one's own.",

"acquisition" :"Anything gained, or made one's own, usually by effort or labor.",

"acquit" : "To free or clear, as from accusation.",

"acquittal" :  "A discharge from accusation by judicial action.",

"acquittance": "Release or discharge from indebtedness, obligation, or responsibility.",

"acreage" : "Quantity or extent of land, especially of cultivated land.",

"acrid" :"Harshly pungent or bitter.",

"acrimonious" : "Full of bitterness." ,

"acrimony" : "Sharpness or bitterness of speech or temper." ,

"actionable" :"Affording cause for instituting an action, as trespass, slanderous words.",

"actuality" : "Any reality."}

X = (input("If you wanna search any word then do\n"))
if X not in Dict:
    exit("Your word is out of dictionary")
if X in Dict:
    print(Dict[X])
    while (True):
        X = (input("If you wanna search any word then do\n"))
        if X in Dict:
            print(Dict[X])
        if X not in Dict:
            print("Your word is out of dictionary")
            break
****#Run it anywhere you want copy my code it works fine with me****

你可以在python的字典上使用while循环吗？

5 个答案: