text: # the fisrt type is tuple
  t1=(1,2,3)
  t2=("Gabriel",4,7,"Andrea",9)
  t3 = t1+t2
  
  t4=(t1,5,"Mario",6)
  t5=(t2,t2,t3,9)
  
  #the second type is list
  names=["sara","andrea","John","babak","Juan"]
  for name in names:
      print("Hi "+name)
  k_materials=[0.9,0.87,1.2,3.5]
  A=1.2
  L=0.03
  for k in k_materials:
      R=L/(k*A)
      print("the conductivity is "+str(k)+" so the resistance is "+str(round(R,4)))
  
  L=[0.02.0.01,0.25,0.9]
  A=[1.2,1.4,1.9.2.5]
  k=[2.3,4.5,6.0, 9]
  
  
  R1=["conductive",1.2,0.03,0.9] #R1[0]: type,R1[1]:area, R1[2]:length,R1[3]=conductivity
  R1_k=R1[0]
  
  #the third type is called a dictionary
  
  Ri={"name":"Ri","type":"conv","area":0.25,"hConv":10}
  R1={"name":"R1","type":"cond","length":0.03,"area":0.25,"k":0.026}
  R2={"name":"R2","type":"cond","length":0.02,"area":0.25,"k":0.22}
  R3={"name":"R3","type":"cond","length":0.16,"area":0.015,"k":0.22}
  R4={"name":"R4","type":"cond","length":0.16,"area":0.22,"k":0.72}
  R5={"name":"R5","type":"cond","length":0.16,"area":0.015,"k":0.22}
  R6={"name":"R6","type":"cond","length":0.02,"area":0.25,"k":0.22}
  Ro={"name":"Ro","type":"conv","area":0.25,"hConv":25}
  R_parallel = [R3,R4,R5]
  