[Python] How does Python convert a string with only numeric characters into a int using int()...

after looking into a lecture I have encountered a small problem. I don't understand the steps or how Python converts a numeric value inside a string into a int(or even a float) using there int() or float() function.

e.g #assign a variable

x = '3'

int(h)

Please mind the fact that I have been trying this code in the python shell and experimenting. I have also tried Python tutor to show me how Python executes this code one by one, which has not been quite descriptive.

I just wish to know how python executes this code one by one and how it converts the string into a integer

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