Indentifying types?

[Oltmans]

I'm reading from a file that contains text like

----
5
google_company
apple_fruit
pencil_object
4
test_one
tst_two
----

When I read the integer 5 I want to make sure it's an integer.
Likewise, for strings, I want to make sure if something is indeed a
string. So how do I check types in Python? I want to check following
types

1- integers
2- strings
3- testing types of a particular class
4- decimal/floats

Please excuse my ignorance & enlighten me. I will really appreciate
any help.

Thanks,
Oltmans