Raise TypeError for invalid input value in class
I am trying to write class
, and I want that if the initial input values for a class are not obeying certain types, this would throw an exception. For example, I would use except TypeError
to return an error. I don't know how this should be done. My first attempt at writing the class
following:
class calibration(object):
def __init__(self, inputs, outputs, calibration_info, interpolations=2):
try:
self.inputs=inputs
except TypeError
self.outputs=outputs
self.cal_info=calibration_info
self.interpol=interpolations
I would like if the value is inputs
not a string it throws an error message. I would appreciate any help.
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Its slightly different between 2.x and 3.x, but use isinstance to determine the type and then throw an exception if you are not satisfied.
class calibration(object):
def __init__(self, inputs, outputs, calibration_info, interpolations=2):
if not isinstance(inputs, basestring):
raise TypeError("input must be a string")
Python2 distinguishes between ascii and unicode strings - "basestring" swaps both of them. There are only unicode strings in python3 and you are using 'str' instead.
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