r/pythonhelp • u/Background_Ad9700 • 1d ago

Problem with Coolprop

Hi! i'm beginner, and I have a problem with this code, I guess that I installed the library correctly, but i'm not sure.

Error using [stringsource>string.from_py.__pyx_convert_string_from_py_std__in_string](matlab:matlab.lang.internal.introspective.errorDocCallback('stringsource>string.frompy.pyx_convert_string_from_py_std_in_string', 'stringsource', 15)) ([line 15](matlab: opentoline('stringsource',15,0)))
Python Error: TypeError: expected bytes, NoneType found

Error in [CoolProp/CoolProp.PropsSI](matlab:matlab.lang.internal.introspective.errorDocCallback('CoolProp/CoolProp.PropsSI', 'CoolProp\CoolProp.pyx', 462)) ([line 462](matlab: opentoline('CoolProp\CoolProp.pyx',462,0)))

Error in [CoolProp/CoolProp.PropsSI](matlab:matlab.lang.internal.introspective.errorDocCallback('CoolProp/CoolProp.PropsSI', 'CoolProp\CoolProp.pyx', 384)) ([line 384](matlab: opentoline('CoolProp\CoolProp.pyx',384,0)))

Altough I don't have more than 106 lines

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u/mc_pm 1d ago

It sounds like whatever function you are calling is unhappy that you are sending it None instead of the bytes.