In Python, the _ call _ function is interesting.

In Python, the _ call _ function is interesting.

This article mainly introduces the interesting function _ call _ in Python. This article provides an example to explain the usage of the _ call _ function, for more information, see

There is an interesting syntax in Python. This type becomes callable when the _ call _ function is implemented when the type is defined.

In other words, we can use this type of object as a function, which is equivalent to overloading the brackets operator.

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Class g_dpm (object ): Def _ init _ (self, g ): Self. g = g Def _ call _ (self, t ): Return (self. g * t ** 2)/2

When computing Earth scenarios, we can set e_dpm = g_dpm (9.8), s = e_dpm (t ).

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Class Animal (object ): Def _ init _ (self, name, legs ): Self. name = name Self. legs = legs Self. stomach = []   Def _ call _ (self, food ): Self. stomach. append (food)   Def poop (self ): If len (self. stomach)> 0: Return self. stomach. pop (0)   Def _ str _ (self ): Return 'a animal named % s' % (self. name)   Cow = Animal ('King', 4) # We make a cow Dog = Animal ('drop', 4) # We can make your animals Print 'we have 2 animales a cow name % s and dog named % s, both have % s legs '% (cow. name, dog. name, cow. legs) Print cow # here _ str _ metod work   # We give food to cow Cow ('gras ') Print cow. stomach   # We give food to dog Dog ('bone ') Dog ('beef ') Print dog. stomach   # What comes inn most come out Print cow. poop () Print cow. stomach # Empty stomach   ''' --> Output We have 2 animales a cow name king and dog named flopp, both have 4 legs A animal named king ['Gras '] ['Bione', 'beef '] Gras [] '''