The following seems to produce what you want using the data provided
```
In [31]: dF = np.genfromtxt('/home/F.csv', delimiter=',').tolist()
In [32]: dS = np.genfromtxt('/home/S.csv', delimiter=',').tolist()
In [33]: r = [True if i in lS else False for i in dF]
In [34]: sum(r)
Out[34]: 300
```
I hope this helps.
--
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