[Tutor] Count for loops

[Rafael Knuth]

>>> b = "3"+b[2:]  #Removing the decimal point so that there are digits only in
>>
>> my_number = 3.14159
>
> Here you assign a floating point number to mmy_number but
> the code Sama wrote was for working with strings read
> from a text file.
>
> You would need to convert it first:
>
> my_number = str(3.14159)
>
>> my_number = "3"+my_number[2:]
>> print(my_number)

Thanks for the clarification.
I tested this approach, and I noticed one weird thing:

Pi_Number = str(3.14159265358979323846264338327950288419716939)
Pi_Number = "3" + Pi_Number[2:]
print(Pi_Number)

== RESTART: C:\Users\Rafael\Documents\01 - BIZ\CODING\Python Code\PPC_56.py ==
3141592653589793
>>>

How come that not the entire string is being printed, but only the
first 16 digits?