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class Steel():

def __init__(self, E=29000, Fy=50, Fu=85, cost=0):

self.E = E

self.Fy = Fy

self.Fu = Fu

self.cost = cost

class A992(Steel):

def __init__(self):

self.E = 29000 #ksi

self.Fy = 50 #ksi

self.Fu = 65 #ksi

self.cost = 0

self.density = 0.2836 #lb/in^3

class A36(Steel):

def __init__(self):

self.E = 29000

self.Fy = 36 #ksi

self.Fu = 58 #ksi

self.poisson = 0.26

class Custom():

"""

>>> ma1 = Custom(E=29000, fy=60)

"""

def __init__(self, E=None, fy=None):

"""

>>> ma1 = Custom(E=29000, fy=60)

>>> ma1.E

29000

>>> ma1.fy

60

"""

self.E = E

self.fy = fy