what does this line explaining the Zen of Python mean?

Question

I mean the part after the greater than signs:

Explicit is better than implicit: It is best to spell out exactly what your code is doing. This is why >>>>>>>> adding a numeric string to an integer requires explicit conversion, rather than having it happen behind the scenes, as it does in other languages.

Answer 1

Sometimes you must specifically tell the python interpreter that a string is a string, and an int is an int.

print(str(807) + "abc")

gives the output 807abc, or

print("807" + "abc")

yields the same.

Where int is used with a string, it goes like this:

print(int("807") + 3)

would have the output 810, and

print( "807" + 3)

would not have been told string "807" is an int like 807.

So that would be a TypeError between adding just "807" + 3, which is a string plus an int.

In another language you might mix the two but with type errors if the string isn't an int.

Remember you can use the type function too:
print(type("807"))
print(type(807))
print(type(int("807")))
print(type(str(807)))

Answer 2

Run a Python program with the only line being

"4"+2

and hopefully you will understand. If not comment here and I will explain.