logreg = linear_model.LogisticRegression(C=1e5)
what is the meaning of the argument ‘C =1e5’ of the above function.
It gives me different output when I remove that.
Logistic regression
It is regularization parameter
U can read about it at
regularization-logistic-regression.html
We will cover regularization as a separate topic in the course 
you will get it then.