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Parse_lists_and_dicts_from_string #112

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Parse_lists_and_dicts_from_string #112

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16 changes: 14 additions & 2 deletions technique/reflectometry/instrument_constants.py
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,8 @@
except ImportError:
from mocks import g

from ast import literal_eval


class InstrumentConstant(object):
"""
Expand Down Expand Up @@ -80,7 +82,17 @@ def get_reflectometry_value(value_name):
"""
pv_name = "REFL_01:CONST:{}".format(value_name)
value = g.get_pv(pv_name, is_local=True)
if value is None:
raise IOError("PV {} does not exist".format(pv_name))

if isinstance(value, str)
try:
# this will try and convert from str to dict/list
value = literal_eval(value)
except ValueError:
# probably OK, just return the original string
return value
except SyntaxError:
# Not ok, raise here, a list has probably not been finished with a ] or similar
raise Exception(f"Constant {value_name} cannot be parsed, evaluating {value} threw an exception")


return value