Indentation levels and scope (Python)

hey there. i'm going through tutorial on python , programming beginners, have been following until having trouble understanding mean 'indentation level' here:

quote

the accessible variable pattern
variable accessible respect particular scope if in scope. variable in scope if local or defined in scope encloses particular scope. scope encloses other scope b if, moving (perhaps repeatedly) leftward scope b, scope can reached. here example:

z = 5

def f(x):
return x + z

print(f(3))

variable z local respect global scope , non-local respect f. however, can move leftward scope of f 1 indentation level , reach global scope z defined. therefore, global scope encloses scope of f , z accessible f. indeed, global scope encloses other scopes , why built-in functions accessible @ indentation level.

click expand...

i want double check understand mean 'indentation level'.
talking line spaces between lines of code (as in space between 2 lines) or how far inside line code indented? or both?

 

code:

  z = 5    def f(x):  return x + z    print(f(3))  

i check tutorial doing because posted above should code below.

code:

  z = 5    def f(x):      return x + z    print(f(3))  

when writing functions in languages java or c++, statements belonging function grouped { }.

code:

  void myfunction()  {       //do  }  

however, python uses indention instead of {} group statements belonging function function

code:

void myfunction():      //do something

 

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