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Nov 4th, 2009

Converting a dictionary into a list of (key, value) tuples

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Ideally I'd like to do it with a list comprehension. Something like this

Python Syntax (Toggle Plain Text)
result = [(key, value)for key in dict.keys(), value in dict.values()]
result = [(key, value)for key in dict.keys(), value in dict.values()]

but clearly that isn't the right format. Any suggestions?

EDIT:

This seems like what I want to do, but it doesn't work:

Python Syntax (Toggle Plain Text)
result = [(dict.keys[i], dict.values[i]) for i in range(1, len(dict))]
result = [(dict.keys[i], dict.values[i]) for i in range(1, len(dict))]

Last edited by tdeck; Nov 4th, 2009 at 6:41 pm.

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Nov 4th, 2009

Re: Converting a dictionary into a list of (key, value) tuples

Take a look at the final lines of this code snippet:
http://www.daniweb.com/code/snippet216747.html

vegaseat

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Re: Converting a dictionary into a list of (key, value) tuples

Click to Expand / Collapse Quote originally posted by vegaseat ...

Take a look at the final lines of this code snippet:
http://www.daniweb.com/code/snippet216747.html

Thanks for that. Weirdly enough, what I'm doing is actually related to counting word frequencies.

I realized that I can just use .items() (feels silly)

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Nov 5th, 2009

Re: Converting a dictionary into a list of (key, value) tuples

If you are brave enough to ask questions, then you are not silly!

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Re: Converting a dictionary into a list of (key, value) tuples

Click to Expand / Collapse Quote originally posted by tdeck ...

Python Syntax (Toggle Plain Text)
result = [(key, value)for key in dict.keys(), value in dict.values()]
result = [(key, value)for key in dict.keys(), value in dict.values()]
...
Python Syntax (Toggle Plain Text)
result = [(dict.keys[i], dict.values[i]) for i in range(1, len(dict))]
result = [(dict.keys[i], dict.values[i]) for i in range(1, len(dict))]

Just please note that in Python, we use the built-in function dict() to convert certain objects to a dictionary. If you used the above code, you would lose this ability as you're overwriting that built-in function with your list!!

EDIT: Notice how dict is highlighted by the syntax highlighting above like the following built-ins (reserved keywords)

python Syntax (Toggle Plain Text)
d = {'a':1, 'b':2, 'c':3}
for idx in xrange(15):
    y += my_list[idx]
    if y == 256:
        break
list('123456890')
dict(some_iterable)
d = {'a':1, 'b':2, 'c':3}
for idx in xrange(15):
    y += my_list[idx]
    if y == 256:
        break
list('123456890')
dict(some_iterable)

Last edited by jlm699; Nov 5th, 2009 at 4:36 pm.

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