转换列表以在python中自定义字典

Question

i want to convert the list data below into a dictionary.how i

['w', 'a', 's', 'x', 'v', 'q']

How to convert it to dictionary with keys but values as list:

{'w':'w.jpg', 'a':'a.jpg', 's':'s.jpg', 'x':'x.jpg', 'v':'v.jpg', 'q':'q.jpg'}

I have a folder of pictures that i want to put them in a dictionary.

Answer 1

>>> l = ['w', 'a', 's', 'x', 'v', 'q']
>>> {e: e+'.jpg' for e in l}
{'w': 'w.jpg', 'a': 'a.jpg', 's': 's.jpg', 'x': 'x.jpg', 'v': 'v.jpg', 'q': 'q.jpg'}

Or

>>> dict(map(lambda x: (x,x+'.jpg'), l))
{'w': 'w.jpg', 'a': 'a.jpg', 's': 's.jpg', 'x': 'x.jpg', 'v': 'v.jpg', 'q': 'q.jpg'}

Or

>>> dict(zip(l,[e+'.jpg' for e in l]))
{'w': 'w.jpg', 'a': 'a.jpg', 's': 's.jpg', 'x': 'x.jpg', 'v': 'v.jpg', 'q': 'q.jpg'}

Answer 2

You can try using zip and list comprehension :

my_images = dict(zip(names,[i+'.jpg' for i in names]))

Output:

{'w': 'w.jpg', 'a': 'a.jpg', 's': 's.jpg', 'x': 'x.jpg', 'v': 'v.jpg', 'q': 'q.jpg'}

Answer 3

if a is your key, you could just use value = a + ".jpg" to get your value. Creating a dictionary for that isn't very useful.

What would be useful would be to create the dictionary and update it later if you need it. In that case, initialize it with a dictionary comprehension (Python 2.7 and higher):

dct = {a:a+".jpg" for a in ['w', 'a', 's', 'x', 'v', 'q']}

This dictionary doesn't bring anything new since values can be deduced from keys with a simple addition.

then to change a value to handle special cases:

dct['w'] = "new_w.jpg"

now the dictionary is useful if you need to handle cases like that. Otherwise avoid it.

Answer 4

lst = ['w', 'a', 's', 'x', 'v', 'q']

images = {key:key+".jpg" for key in lst}

Output:

{'a': 'a.jpg',
 'q': 'q.jpg',
 's': 's.jpg',
 'v': 'v.jpg',
 'w': 'w.jpg',
 'x': 'x.jpg'}