Python calls object properties or methods through strings

The following is an example of how Python calls object properties or methods through strings. It has a good reference value and I hope it will be helpful to everyone. Let’s take a look together

Sometimes you need to pass in properties or methods as parameters. At this time, you can call object properties or methods with strings in the following ways

1. eval

##

In [634]: def getmethod(x,char='just for test'):
  ...:  return eval('str.%s' % x)(char)
  ...:

In [635]: getmethod('upper')
Out[635]: 'JUST FOR TEST'

2. getattr

In [650]: def getmethod2(x, char='just for test'):
  ...:  return getattr(char, x)()
  ...:

In [651]: getmethod2('upper')
Out[651]: 'JUST FOR TEST'

3. Use the built-in library operator

In [648]: def getmethod3(x, char='just for test'):
  ...:  return operator.methodcaller(x, char)(str)
  ...:

In [649]: getmethod3('upper')
Out[649]: 'JUST FOR TEST'

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