How to loop content correctly

Question

I don't understand how the Python for loop works because I get a different result:

from itertools import groupby

 all = {}
 data = {'date': '10/12/19', 'name': 'jerry', 'id': 'Hello001'}

 for g , k in groupby(data, lambda r: (r[ 'date' ])):
        for i in k:
        #other data
        all.update({
            "date": i[ 'date' ],
            "name": i[ 'name' ],
        })

        print(all)
        for get in all:
            print(get)

Result of first print

{'date': '10/12/19', 'name': 'jerry', 'id': 'Hello001'}

Result of second print in loop

date
name
id

Why does the second print result only print the header?

Iteration over dictionary is just over its keys (the one you referred to as headers) and not values. If you want both keys and values, use `.items()`. — Austin, Apr 06 '19 at 15:58
I did try `all.items()` in for loop but the data structure will not be the same as first print. — filipsoc, Apr 06 '19 at 15:59
@filipsoc You don't have JSON; you have a `dict`. If you need JSON, you'll want to reconstruct the `dict` anyway to pass to `json.dump` or `json.dumps`. — chepner, Apr 06 '19 at 16:40

score 0 · Answer 1 · answered Apr 06 '19 at 16:02

0

If you want to print key and value you should do this

for key in all:
    print(key, all[key])

Or you can use .items() method

for key, value in all.items():
    print(key, value)

answered Apr 06 '19 at 16:02

S. Ellis

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How to loop content correctly

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