Why are some Python strings are printed with quotes and some are printed without quotes? [duplicate]

Question

I have a problem with string representations. I am trying to print my object and I sometimes get single quotes in the output. Please help me to understand why it happens and how can I print out the object without quotes.

Here is my code:

class Tree: def __init__(self, value, *children): self.value = value self.children = list(children) self.marker = "" def __repr__(self): if len(self.children) == 0: return '%s' %self.value else: childrenStr = ' '.join(map(repr, self.children)) return '(%s %s)' % (self.value, childrenStr)

Here is what I do:

from Tree import Tree t = Tree('X', Tree('Y','y'), Tree('Z', 'z')) print t

Here is what I get:

(X (Y 'y') (Z 'z'))

Here is what I want to get:

(X (Y y) (Z z))

Why do the quotes appear around the values of terminal nodes, but not around the values of non-terminals?

OK, I found the explanation why repr(x) produces strings in quotes here — Olga
– Olga, Commented Jun 18, 2013 at 14:56

mgilson · Accepted Answer · 2013-06-18 14:47:54Z

repr on a string gives quotes while str does not. e.g.:

>>> s = 'foo' >>> print str(s) foo >>> print repr(s) 'foo'

Try:

def __repr__(self): if len(self.children) == 0: return '%s' %self.value else: childrenStr = ' '.join(map(str, self.children)) #str, not repr! return '(%s %s)' % (self.value, childrenStr)

instead.

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