Python: Extract all values in a dictionary into assignment statements?

Question

For a dictionary d={'foo1': 1, 'foo2': 2, 'foo3': 3}, what is the most efficient way to assign the strings to their definitions:

foo1=1
foo2=2
foo3=3

When no assignment statements are used, I need to call the entry with the dictionary, eg. d['foo1'], but I don't plan to use this.

Note: Thanks for pointing out that it was a string. However, I am now assigning the string terms to their corresponding values in the dictionary.

Possible duplicate of Python: Create a global variable from a string? — Torxed
– Torxed, Commented Nov 10, 2015 at 9:43

Colin · Accepted Answer · 2015-11-10 09:38:01Z

4

d = {'a': 1, 'b': 2}
locals().update(d)

answered Nov 10, 2015 at 9:38

Colin

2,18714 silver badges17 bronze badges

Sign up to request clarification or add additional context in comments.

6 Comments

Torxed Over a year ago

Nice pointing out update(), was unaware that it took a dictionary : )

Dunes Over a year ago

This doesn't work. Locals only gives you a view. You cannot use it to add, delete or change the contents of a variable. You can mutate a referenced object, but that's different. docs.python.org/3/library/functions.html#locals

txsaw1 Over a year ago

Does globals make a difference?

Dunes Over a year ago

Yes. Globals are stored in a dict internally. Globals just gives you access to that dict. Locals are stored differently. The function creates a dict from the underlying storage implementation.

Dunes Over a year ago

Then you're fine. But that means you can't use dict.update. You have to do stuff like: locals()[name].attr = new_value. It makes your implementation fragile. Just use a dict and stop trying to force locals to do something it's not meant for. If you really must, then create an object and update its internal __dict__. Eg. obj.name becomes vars(obj)["name"]

|

Torxed · Accepted Answer · 2015-11-10 09:44:26Z

3

>>> globals()['test'] = 10
>>> test
10

Not the most pretty way, but it works.

d = {'foo1': 1, 'foo2': 2, 'foo3': 3}
for key, val in d.items():
    globals()[key] = val
print(foo1)

(Or use locals(), but Colin beat me to it)

edited Nov 10, 2015 at 9:44

answered Nov 10, 2015 at 9:37

Torxed

23.6k15 gold badges91 silver badges135 bronze badges

2 Comments

txsaw1 Over a year ago

May I understand how 'test' relates to my examples above?

Torxed Over a year ago

@teachmyselfhowtocode It was a example of how you can assign variables via "strings", your solution is the two rows below. The first was just a test so you can see the principle of how it works.

Collectives™ on Stack Overflow

Python: Extract all values in a dictionary into assignment statements?

2 Answers 2

6 Comments

2 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

6 Comments

2 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related