comefrom: <qiyuangong>342_Power_of_Four_1.py
code: def isPowerOfFour( num):
      return num > 0 and num & (num-1) == 0 and len(bin(num)[3:]) % 2 == 0
masked: def sample_funcname ( var_0 ) :
      return var_0 > 0 and var_0 & ( var_0 - 1 ) == 0 and len ( bin ( var_0 ) [ 3 : ] ) % 2 == 0
  