String formatting [str.format()] with a dictionary key which is a str() of a number

Question

Python neophyte here. I was wondering if someone could help with the KeyError I am getting when using a dictionary for string interpolation in str.format.

Answer 1

If your dictionary keys are strings, a possible workaround is to convert your dictionary to a class:

class ClassFromDict:
    def __init__ (self, dct) :
        for key in dct.keys():
            self.__dict__[key] = dct[key]

dictionary = {'key1': 'val1', '1': 'val2'}
classfromdict = ClassFromDict(dictionary)

string1 = 'Interpolating {0.key1}'.format(classfromdict)
print string1
string2 = 'Interpolating {0.1}'.format(classfromdict)
print string2