code: def bradford_pdf(x, c):
      if 0 <= x <= 1:
          return 1.0 / (1.0 + c * x)
      return 0.0
  
imports: import math
  import numbers
  import numpy
  from scipy import stats
  from scipy import special
  from ._qmc import check_random_state, Halton, QMCEngine
  from ._unuran.unuran_wrapper import NumericalInversePolynomial
  from scipy._lib._util import check_random_state
label_desc: Use image node_id 13 for calling a global function with example usage: bradford_pdf(x, c) and returns: int, unknown