Question

I want to iterate through the dict, spam, and print the result in the format of "key: value". There’s something wrong with my code that’s producing a different result.

Is there any ways of correcting the output? And why I’m I getting this output?

spam = {'color': 'red', 'age': '42', 'planet of origin': 'mars'}

for k in spam.keys():
    print(str(k) + ': ' + str(spam.values()))

The result in getting:

color: dict_values(['red', '42', 'mars'])
age: dict_values(['red', '42', 'mars'])
planet of origin: dict_values(['red', '42', 'mars'])

The expected result:

color: red
age: 42
planet of origin: mars

Answer 1

You should instead be using dict.items instead, since dict.keys only iterate through the keys, and then you're printing dict.values() which returns all the values of the dict.

spam = {'color': 'red', 'age': '42','planet of origin': 'mars'}

 for k,v in spam.items():
     print(str(k)+': '  + str(v))

Answer 2

dict.values() returns a list of all the values in a dictionary. Why not do a key lookup?

for k in spam.keys():
     print(str(k)+': '  + spam[k])

Or even better:

for k, v in spam.items():
    print('{}: {}'.format(k, v))

Answer 3

Change str(spam.values()) to spam[k]. The first option gives all values inside the dictionary, the second one yields the value belonging to the current key k.

Answer 4

你可以这样做：

spam = {'color': 'red', 'age': '42','planet of origin': 'mars'}


for k in spam.keys():

    print(k+  ":"  +spam[k] )

Answer 5

你尝试过吗？

for k in spam:
    print(str(k)+':'+str(spam[k]))

Answer 6

尝试以下代码，

s={'name': 'you', 'number': 123, 'password': '555', 'amt': 800}


for i in s:
    print(i,"=>" ,s[i])

Answer 7

按照mathias711的建议去做！实际上你的代码用str(spam.values())做的是写下dict的所有值。通过str(spam[k])，您可以获得与密钥“k”相关联的值。在dict＆＃39;垃圾邮件＆＃39;。如果您确实希望输出按特定顺序排列，则应该有一个列表，其中所有键按此顺序排序，因为默认情况下不会对字典进行排序。

你的代码看起来像这样：

spam = {'color': 'red', 'age': '42','planet of origin': 'mars'} 

liste_ordered_for_output['color', 'age', 'planet of origin']


for key in liste_ordered_for_output:
    print(str(key)+': '  + str(spam[key]))

Print the dict with “key: value” pairs in a for loop

7 个答案: