CODEWITHSUNDEEP
pythondictionarytuples
maximus
maximus

Reputation: 99

How to Convert Tuple to Dictionary?

i'm using Python 2.5 and Win XP. i have a tuple as below:

>>> a
(None, '{1: 2, 2: 4, 3: 6, 4: 8, 5: 10, 6: 12}')
>>> a[1]
'{1: 2, 2: 4, 3: 6, 4: 8, 5: 10, 6: 12}'
>>>

i want to convert tuple a[1] to dictionary because i want to use the key and value. pls help to advise. tq

Upvotes: 1

Views: 2110

Answers (5)

lecodesportif
lecodesportif

Reputation: 11049

There is another way to do it, without using any imports.

A simple list comprehension (temp):

>>> a
(None, '{1: 2, 2: 4, 3: 6, 4: 8, 5: 10, 6: 12}')
>>> a[1]
'{1: 2, 2: 4, 3: 6, 4: 8, 5: 10, 6: 12}'
>>> temp = [[int(c) for c in b.split(":")] for b in a[1].strip('{}').split(",")]
>>> a_dict = dict(temp)
>>> a_dict[1]
2
>>> a_dict[2]
4

Upvotes: 1

Don
Don

Reputation: 17606

If you trust the source of a[1] you can use eval:

dictionary = eval(a[1])

Otherwise you can use json (or simplejson in Python 2.5: see here) :

import json
dictionay = json.loads(a[1])

Note: it mostly depends on how you got the string: if it comes from a repr and cannot be hacked, eval may be good. If it came from json.dumps (which would result in a different string), you should use json.loads.

Upvotes: 1

jfs
jfs

Reputation: 414159

>>> import ast
>>> ast.literal_eval(a[1])
{1: 2, 2: 4, 3: 6, 4: 8, 5: 10, 6: 12}

Upvotes: 5

das_weezul
das_weezul

Reputation: 6142

The dict() constructor builds dictionaries directly from lists of key-value pairs stored as tuples. When the pairs form a pattern, list comprehensions can compactly specify the key-value list.

dict([('sape', 4139), ('guido', 4127), ('jack', 4098)]) {'sape': 4139, 'jack': 4098, 'guido': 4127} dict([(x, x**2) for x in (2, 4, 6)]) # use a list comprehension {2: 4, 4: 16, 6: 36}

Copy & Paste from: http://docs.python.org/tutorial/datastructures.html

Upvotes: 0

euphoria83
euphoria83

Reputation: 15136

First split the string on comma. Iterate over all parts. Split each part on colon. Convert the strings into integers. Add the second integer as value for the first integer as key.

Upvotes: 3

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