<qiyuangong>136_Single_Number_2.py
def singleNumber( nums):
    s = set()
    for num in nums:
        if num in s:
            s.remove(num)
        else:
            s.add(num)
    return s.pop()
def sample_funcname ( var_0 ) :
    var_2 = set ( )
    for var_3 in var_0 :
        if var_3 in var_2 :
            var_2.remove ( var_3 )
        else :
            var_2.add ( var_3 )
    return var_2.pop ( )
