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Because during an assignment, the RHS is evaluated first and the result is assignment to the given identifier. In this case, the `x` on the RHS was a function and the result (1 + x() = 1 + 2) was REASSIGNED/BOUND to the same identifier. Post reassignment, x is bound to a int literal, while before it was bound to a function.
I hope this snippet will help: https://prnt.sc/u1u8ki
def x(i):
print(i)
return i
x=x(1)+x(2)
Expression is evaluated from left to right, function return takes more precedence then followed by operator and finally value is assigned which is of least precedence. Above example would illustrate it.
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