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Is there a distinction between == and is in python? sure, they've a completely essential difference. ==: take a look at for equality the semantics are that equivalent items (that are not necessarily the equal object) will check as same. because the documentation says: the operators ==, >=, Three approaches of a way to calculate exponent in python?. The elif announcement permits you to check a couple of expressions for true and execute a block of code as quickly as one of the conditions evaluates to real. ! /usr/bin/python var = one hundred if var == two hundred: print "1 got a true expression value" print var elif var == a hundred and fifty: print "2 were given a true expression cost. In python, += is sugar coating for the __iadd__ special technique, or __add__ or __radd__ if __iadd__ isn't always present. the __iadd__ approach of a category can do something it needs. the list object implements it and uses it to iterate over an iterable item appending every ...