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I have been using Mathematica, now would like to switch to Sage. Is there a way that I can convert my existing Mathematica notebooks to Sage?

Suppose that you have a file '/tmp/DataFile' containing the following text

3;2
2;1
1;0.1
0.01;-0.9

Then you can load the two data columns into two arrays xArr and yArr by the following code

f = open('/home/tobi/tmp/DataFile', 'r')

xArr=[]
yArr=[]
line=f.readline()
while(line !=''): 
    xy=line.split(';')
    xArr.append(float(xy[0]))
    yArr.append(float(xy[1]))
    line=f.readline()

Now you can do whatever you want with these array, for example plot them

list_plot(zip(xArr,yArr))

If you like to understand better what open and readline does look at Python doc input output, the split command is explained in the Python doc on strings

Is it possible to plot data imported from an ASCII file.