Calculator only does the + function

[Clunk_Head]

You need to have an expression on each side of the or. if Calcop == 1 or '+': is equivalent to if (Calcop == 1) or ('+'):. (see here for details)

Also you are casting your input to an int

Calcop = int(input("What operation do you want?\n1)+\n2)-\n3)x\n4)÷\n5)Mod\n6)Rounding\n7)Ceil\n8)Floor\n"))

Since your input can be an it or a string, just leave it as a string and adjust your tests for strings

Calcop = input("What operation do you want?\n1)+\n2)-\n3)x\n4)÷\n5)Mod\n6)Rounding\n7)Ceil\n8)Floor\n")
if Calcop == '1' or Calcop == '+':