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I'll add something to @aak2166 answer.
Some library you might want to use are going to be exclusively in Python or in CPP. For example, as far as I know, PCL is only in C++ so if you want to use it, you will have to learn C++. Smash is only in python.
So it depend as well on your project but knowing both is certainly an advantage since you won't be limited by this.