The temperature variation of D.C. electrical resistivity measured on the Y1−xPrxBa2Cu3Oysamples (x=0, 0.2, 0.4, and 0.5) show that Variable Range Hopping (VRH) is the dominant conduction mechanism in the semiconducting state of these samples below 250 K. However, we could not distinguish between the two and three dimensional (2D and 3D) VRH.