'Looping' does not work out within a 'for Loop'

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Hi^^

I just cannot find my mistake regards to an ecercise I have made.
Before asking my questions, I just include here my Code and the output:

# This is a guess the number game.
import random
secretNumber = random.randint(1, 20)
print('I am thinking of a number between 1 and 20.')

# Ask the player to guess 6 times.
for guessesTaken in range(1, 7):
    print('Take a guess.')
    guess = int(input())

    if guess < secretNumber:
        print('Your guess is too low.')
    elif guess > secretNumber:
        print('Your guess is too high.')
    else:
        break # this condition is the right guess!

    if guess == secretNumber:
        print('Good job! You guessed my number in ' +str(guessesTaken) +'guesses!')
    else:
         print('Nope. The number I was thinking of was ' + str(secretNumber))

Output:

Output:
Python 3.7.0 (v3.7.0:1bf9cc5093, Jun 27 2018, 04:06:47) [MSC v.1914 32 bit (Intel)] on win32
Type "copyright", "credits" or "license()" for more information.
>>> 
 RESTART: C:\Users\kr-ga\AppData\Local\Programs\Python\Python37-32\BOOK_automate_the\Chapter 3\guesstheNumber.py 
I am thinking of a number between 1 and 20.
Take a guess.
7
Your guess is too low.
Nope. The number I was thinking of was 18
Take a guess.
6
Your guess is too low.
Nope. The number I was thinking of was 18
Take a guess.

As you can see, the code does not loop as it supposeldy should after the user has taken a guess (input), or it does, but not properly - meaning it jumps right away to a solution.
Any ideas, where I have made a mistake to cause this bug?

other question/concerns are:

1.) How this little program knows whicch number it has defiend as the secretnumber that is to guess?
I see only that within the code a range is defined, of where the secretnumber lies, but I do not see an exact determined value?

2.) Is 'guessesTaken' somehow an already defined value in python?