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Program to read numbers from a file and determine histogram of the data

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#Program to read numbers from a file and determine histogram of the data:
f1=open("hg3.d","r")
n=input("Enter the no. of lines:")
n=int(n)
h=[0 for i in range (n)]
x=[]
for i in f1:
 x.append(eval(i))
t=len(x)
mn=min(x)
mx=max(x)
R=(mx-mn)*1.01
bs=R/n
for i in range (t):
 k=int(abs((h[i]-mn)/bs))
 h[k]=h[k]+1.0
 f=[]
for i in range (n):
 d=mn+(i*bs)
 f.append(d)
f1.close()
f2=open("hg2.d","w")
a=len(f)
for i in range (a):
 print(h[i],f[i],"-",f[i]+bs,file=f2)
f2.close


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