Calling a function from a string in Python throws error

Question

I am trying to call a function from a string in Python as explained in Calling a function of a module from a string with the function's name in Python.

Unfortunately, this doesn't work, and the Python interpreter throws an error: TypeError: 'str' object is not callable

def current(self, t):
    if self.iMode == None:
        return self.i
    else:
        return getattr(self, 'iMode')(t)

The error refers to the last line. iMode has been set to sinx(t), that has been declared in the class.

Can anyone help me please?

Questions concerning problems with code you've written must describe the specific problem and include valid code to reproduce it. See SSCCE.org for guidance. — Marcin
– Marcin, Commented Jul 24, 2013 at 14:19

Ber · Accepted Answer · 2013-07-24 12:58:11Z

2

From the error message it is obvious that your attribute was set to 'sinx(t)' (the string literal).

You should set it the function reference sinx instead, which is a callable.

However, as zhangyangu already said, in you example using getattr() is not needed. Maybe you really want to use a parameter (string reference) instead of the literal 'iMode'?

answered Jul 24, 2013 at 12:58

Ber

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Comments

zhangyangyu · Accepted Answer · 2013-07-24 12:21:45Z

0

From the error, your iMode is a string. The iMode is not a method. There must be something wrong with your declaration. And in the class you can use self.iMode, no need to use getattr.

I think you may look for the function like eval.

edited Jul 24, 2013 at 12:21

answered Jul 24, 2013 at 12:16

zhangyangyu

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