>>> def compose1 ( f , g ): return lambda x : f ( g ( x ))
We can understand the structure of a lambda expression by constructing a
corresponding English sentence:
lambda x : f(g(x))
"A function that takes x and returns f(g(x))"
The result of a lambda expression is called a lambda function. It has no
intrinsic name (and so Python prints <lambda> for the name), but otherwise
it behaves like any other function.
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