Sometimes, because of carelessness or other reasons, we might end up with an infinitive loop (refer to the following program). Our original intention is to print just four numbers ranging from one to four. However, since we forgot to add 1 to the variable i after each printing, the exit condition will never be satisfied, that is, it leads to an infinitive loop. For such cases, we could use Ctrl + C or Ctrl + Enter to stop such an infinitive loop:

i=1
While i<5:
    Print i
>>>

If these commands do not work, then use Ctrl + Alt + Del to launch the Task Manager, choose Python, and then click on End Task.

def bs_put(S,X,T,rf,sigma):
    from scipy import log,exp,sqrt,stats
    d1=(log(S/X)+(rf+sigma*sigma/2.)*T)/(sigma...