In [1]: eval("{'test':true,'test1':false}")
---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
<ipython-input-1-ce4b60336849> in <module>
----> 1 eval("{'test':true,'test1':false}")

<string> in <module>

NameError: name 'true' is not defined

In [2]: true = True

In [3]: false = False

In [4]: eval("{'test':true,'test1':false}")
Out[4]: {'test': True, 'test1': False}