first function

[astral_travel]

do we convert the data type ?
where in the program is the conversion occurs ?

[Yoriz]

There is no conversion, calling the built-in function int by passing it a string, the string remains a string, a integer object is returned from the function.

input_str = "10"
print(type(input_str))
returned_int = int(input_str)
print(type(input_str))
print(type(returned_int))

Output:
<class 'str'>
<class 'str'>
<class 'int'>

[rob101]

number = get_int(input("Number: ")) passes a str object (which is what is returned from the input() function) to our get_int() function. Then, try: n = int(n), tries to type convert the srt object (which in n in this function) to an int object.

def get_int(n):
    try:
        print(f"Type converting {type(n)}")
        n = int(n)
        print(f"Type conversion to {type(n)} done.")
        return n
    except ValueError:
        print(f"Type conversion of {n} failed.")
        return False


while True:
    number = get_int(input("Number: "))

    if number:
        # do whatever
        print(number, type(number))
    else:
        print("Error in number input")

With a input of 12:

Output:
Type converting <class 'str'>
Type conversion to <class 'int'> done.
12 <class 'int'>

[deanhystad]

int(arg) raises a ValueError if the string cannot be interpreted as an integer. The arg is the correct type for this operation (it is a str), but the Value of the string is wrong.

arg = "Hi mom!"
number = int(arg)

Error:
ValueError: invalid literal for int() with base 10: 'Hi mom!'

A TypeError is raised when you pass an argument that is incompatible with the operation being performed.

arg = [1, 2, 3]
number = int(arg)

Error:
    number = int(arg)
TypeError: int() argument must be a string, a bytes-like object or a real number, not 'list'

Here args cannot be converted to an int because str() doesn't know how to convert a list into an int. The Type of arg is wrong.

[astral_travel]

okay,
so from what i understood, is even if the the value is a str initially, it will be converted only if it's comprised of digits....otherwise it's a ValueError, and if it's another kind of data type not compatible with being converted into an int - it's a TypeError. understood correctly ?

what does the 'base 10' means ? (invalid literal for int() with base 10)

thank you

[deanhystad]

It means base 10. 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10... base 2 is 0, 1, 10, 11, 100, 101, 110, 111...base 16 is 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f

[astral_travel]

alright, cool !
so it would be simply called decimal, base 2 is binary, 8 is octal, and 16 is hexadecimal,

just got to know the correlation