Question

str = ''

for i in self.obj:
    str += '[' + self.obj[i] + ']';

Is there a way to simplify the code?

Answer 1

Assuming that self.obj is a dict:

string = ''.join('[%s]' % x for x in self.obj.itervalues())

If it’s a custom object implementing __getitem__ instead:

string = ''.join('[%s]' % self.obj[x] for x in self.obj)

Note that I don’t use str as a variable name. You shouldn’t do this as well, because it’s a builtin function in Python.

UPDATE: Regarding your last comment, you could do something like this:

string = ''.join('[%s%s]' % (x[1:], self.obj[x]) for x in self.obj)

Or if you prefer the (more Pythonic?) format method:

string = ''.join('[{0}{1}]'.format(x[1:], self.obj[x]) for x in self.obj)