True。fooBar = False
for key, value in my_dict.items():
if (condition):
fooBar = True
我需要使用for循环并遍历字典中的所有项吗，还是可以使用while循环？
你不必继续迭代整个字典 - 你可以在循环中使用break关键字来跳出循环:
fooBar = False
for key, value in my_dict.items():
if (condition):
fooBar = True
break # Here!
如果使用Python语言，更加推荐使用any函数：
any(condition for k, v in my_dict.items())
(key, value)的和大于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
正如文档中所提到的，any 相当于：
def any(iterable):
for element in iterable:
if element:
return True
return False
这看起来非常像你编写的函数代码。
any(complex_processing(k, v) for k, v in my_dict.items()) - Eric Duminilwhile保留给无法预测循环何时结束的情况。for循环中使用else。for key, value in my_dict.items():
if condition:
break
else:
# here we know that the loop went to the end without a break
仅代表个人观点：遍历字典时应该不使用break，以处理所有项目。潜在的break意味着某处存在线性搜索，如果数据组织得更好（例如，将值存储为其他字典的键，具体取决于您要查找的内容，因此查找更快），则速度可能会更快。
my_dict = {"a": 12, "b", 43, "c": 5"}
comp = my_dict.items() # [("a", 12), ("b", 43), ("c", 5)]
i = 0
while True:
# some code
current = comp[i]
i += 1
print("It is a dictionary")
dt = {
"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 dt:
exit("Your word is out of dictionary")
if X in dt:
print(dt[X])
while (True):
X = (input("If you wanna search any word then do\n"))
if X in dt:
print(dt[X])
if X not in dt:
print("Your word is out of dictionary")
break
#Run it anywhere you want copy my code it works fine with me it is made using while loop so feel free to use it
是的，我们肯定可以在Python中使用while循环来迭代字典。
这是一个字典的例子
d = {1: 1, 2: 8, 3: 27, 4: 64, 5: 125, 6: 216, 7: 343, 8: 512, 9: 729, 10: 1000}
使用while循环遍历字典
dl = list(d)
i = 0
while i<len(d):
print(dl[i])
i+=1
通过将整个字典转换为列表，我们可以使用while循环通过索引位置进行迭代
使用while循环遍历字典键和值
k = list(d.keys())
v = list(d.values())
i = 0
while i<len(d):
print(k[i],' ',v[i])
i+=1
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****
fooBar = True之后尝试使用break。 - NendoTakawhile循环，如果你真的有某些原因必须这样做，那么每个 for 循环都可以写成 while 循环，但我并不认为它比你的 for 循环更有优势。 - juanpa.arrivillaga.keys()返回类似集合的视图，如果值是适当的类型，则.items()视图也是类似集合的。 - PM 2Ringbreak意味着某个地方存在线性搜索，如果数据组织得更好，则可能会更快。 - Jean-François Fabre.viewkeys()等。 - PM 2Ring