diff --git a/Freitag/__pycache__/decorators.cpython-39.pyc b/Freitag/__pycache__/decorators.cpython-39.pyc
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diff --git a/Freitag/__pycache__/utilities.cpython-39.pyc b/Freitag/__pycache__/utilities.cpython-39.pyc
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diff --git a/Freitag/db_con.py b/Freitag/db_con.py
new file mode 100644
index 0000000..2688c19
--- /dev/null
+++ b/Freitag/db_con.py
@@ -0,0 +1,28 @@
+#! /usr/bin/env python3
+#
+#Benötigt python3-pymysql
+# mysql -h notebook14 -u python -pvilla inventory
+import sys
+import pymysql
+
+from utilities import hide_exception
+
+def db_connect(credentials: dict):
+    connection = pymysql.connect(**credentials)
+    return connection
+
+# Passwort aus Konfigiruationsdaten lesen
+credentials = dict(
+    host = 'notebook14', 
+    user = 'python',
+    password = 'villa',
+    database = 'inventory'
+)
+
+#Connection
+def main():
+    db = db_connect(credentials)
+    db.close()
+
+
+hide_exception(main)
\ No newline at end of file
diff --git a/Freitag/db_insert.py b/Freitag/db_insert.py
new file mode 100644
index 0000000..629ce22
--- /dev/null
+++ b/Freitag/db_insert.py
@@ -0,0 +1,63 @@
+#! /usr/bin/env python3
+#
+#Benötigt python3-pymysql
+# mysql -h notebook14 -u python -pvilla inventory
+import sys
+import pymysql
+
+from utilities import hide_exception
+
+def db_connect(credentials: dict):
+    connection = pymysql.connect(**credentials)
+    return connection
+
+# Passwort aus Konfigiruationsdaten lesen
+credentials = dict(
+    host = 'notebook14', 
+    user = 'python',
+    password = 'villa',
+    database = 'inventory'
+)
+
+
+def list_hosts(connection):
+    cursor = connection.cursor()
+    sql =   """
+            SELECT name, domain, address 
+            FROM hosts 
+            ORDER BY name
+            """
+    cursor.execute(sql)
+    #ermittlung cursor.fetchone() eine Zeile cursor.fetchmany() gibt vile in einer Zeile 
+    # cursor ist Iterator
+    #test = [row for row in cursor]
+    for row in cursor:
+        print("{0:20} {2:15} {2}".format(*row))
+
+def add_host(connection, args):
+    cursor = connection.cursor()
+    sql =  """
+            INSERT INTO hosts
+            (name, domain, address)
+            VALUES (%(name)s, %(domain)s, %(address)s)
+            """
+            # oder mit .format(**args) {name} usw
+    cursor.execute(sql,args)
+    connection.commit()
+
+
+#Connection
+def main():
+    db = db_connect(credentials)
+    #list_hosts(db)
+    row = dict(
+        name='notebook999',
+        domain='linuxhotel.de',
+        address='192.168.1.254',
+        db = 'hosts'
+    )
+    add_host(db, row)
+    db.close()
+
+
+hide_exception(main)
\ No newline at end of file
diff --git a/Freitag/db_select.py b/Freitag/db_select.py
new file mode 100644
index 0000000..b410161
--- /dev/null
+++ b/Freitag/db_select.py
@@ -0,0 +1,45 @@
+#! /usr/bin/env python3
+#
+#Benötigt python3-pymysql
+# mysql -h notebook14 -u python -pvilla inventory
+import sys
+import pymysql
+
+from utilities import hide_exception
+
+def db_connect(credentials: dict):
+    connection = pymysql.connect(**credentials)
+    return connection
+
+# Passwort aus Konfigiruationsdaten lesen
+credentials = dict(
+    host = 'notebook14', 
+    user = 'python',
+    password = 'villa',
+    database = 'inventory'
+)
+
+
+def list_hosts(connection):
+    cursor = connection.cursor()
+    sql =   """
+            SELECT name, domain, address 
+            FROM hosts 
+            ORDER BY name
+            """
+    cursor.execute(sql)
+    #ermittlung cursor.fetchone() eine Zeile cursor.fetchmany() gibt vile in einer Zeile 
+    # cursor ist Iterator
+    #test = [row for row in cursor]
+    for row in cursor:
+        print("{0:20} {2:23} {1:15}".format(*row))
+
+
+#Connection
+def main():
+    db = db_connect(credentials)
+    list_hosts(db)
+    db.close()
+
+
+hide_exception(main)
\ No newline at end of file
diff --git a/Freitag/decorators.py b/Freitag/decorators.py
new file mode 100644
index 0000000..1a45fe8
--- /dev/null
+++ b/Freitag/decorators.py
@@ -0,0 +1,33 @@
+#!/usr/bin/env python3
+
+def counter(func):
+    def counting(*args, **kwargs):
+        counting.callcount += 1
+        return func(*args, **kwargs)
+    counting.callcount = 0
+    return counting
+
+def get_counter(func):
+    try:
+        return func.callcount
+    except:
+        return None
+
+def reset_counter(func):
+    try:
+        func.callcount
+        func.callcount = 0
+    except:
+        return None
+
+def trace(func):
+    def tracing(*args, **kwargs):
+        tracing.level += 1
+        print(' '*(tracing.level*4) + "BEGIN function", func.__name__)
+        result = func(*args, **kwargs)
+        print(' '*(tracing.level*4) + "End function", func.__name__)
+        tracing.level -= 1 
+        return result
+
+    tracing.level = 0
+    return tracing
\ No newline at end of file
diff --git a/Freitag/ext_ip.py b/Freitag/ext_ip.py
new file mode 100644
index 0000000..ab5a64f
--- /dev/null
+++ b/Freitag/ext_ip.py
@@ -0,0 +1,24 @@
+#! /usr/bin/env python3
+import requests
+#import json
+#localdata = json.loads(json_string) # erzeugt Python-Datemstruktur
+#jsonstring = json.dumps(data) # erzeugt eni Json-String der Daten
+#http://ip.jsontest.com
+#https://luonnotar.infodrom.org/json
+def get_external_ip():
+    url = 'https://luonnotar.infodrom.org/json'
+    response = requests.get(url)
+    if response.status_code != 200:
+        raise Exception("HTTP Status is " + str(response.status_code))
+    #text = response.content.decode()
+    #print("Content-type der Antwort:", response.headers['Content-Type'])
+    data = response.json()
+    if 'application/json' not in response.headers['Content-Type']:
+        raise Exception ("Content-Type is not application/json")
+    ip = data['ip']['remote']
+    return ip
+ 
+
+
+ip = get_external_ip()
+print("Aktuelle externe IP-Addresse: ", ip)
\ No newline at end of file
diff --git a/Freitag/fakultät.py b/Freitag/fakultät.py
new file mode 100644
index 0000000..79a496c
--- /dev/null
+++ b/Freitag/fakultät.py
@@ -0,0 +1,22 @@
+#!/usr/bin/env python3
+from decorators import counter, get_counter, trace
+
+
+@counter
+def fak(n):
+    if type(n) is not int or n < 0:
+        raise TypeError("Illegal type")
+    if n == 0: 
+        return 1
+    return n * fak(n-1)
+
+print("6! =", fak(6))
+print("Anzahl Aufrufe:", get_counter(fak))
+
+@trace
+def fak(n): 
+    if n == 0: 
+        return 1
+    return n * fak(n-1)
+
+print(fak(4))
\ No newline at end of file
diff --git a/Freitag/fibonacci.py b/Freitag/fibonacci.py
new file mode 100644
index 0000000..28d0ac8
--- /dev/null
+++ b/Freitag/fibonacci.py
@@ -0,0 +1,37 @@
+#! /usr/bin/env python3
+
+def fibonacci(n): 
+    if n == 1 or n == 2: 
+        return 1
+    #Rekursiver Funktionsaufruf 
+    #return fibonacci(n - 1) + fibonacci(n - 2)
+    fn_1, fn_2 = 1, 1
+    for i in range(n-2):
+        fn_1, fn_2 = fn_1 + fn_2, fn_1
+    return fn_1
+
+def fibonacci_folge(n): 
+    if n >= 1:
+        #print("yield 1 (fib(1))")
+        yield 1
+    if n >=2:
+        #print("yield 1 (fib(2))")
+        yield 1
+    #Rekursiver Funktionsaufruf 
+    #return fibonacci(n - 1) + fibonacci(n - 2)
+    fn_1, fn_2 = 1, 1
+    for i in range(n-2):
+        fn_1, fn_2 = fn_1 + fn_2, fn_1
+        #print("yield {} (fib({}))".format(fn_1, i+3))
+        yield fn_1
+
+#print("fib(5) =", fibonacci(5))
+#
+# print("fib(40) =", fibonacci(400))
+
+for nr, fib in enumerate(fibonacci_folge(30)):
+    print(nr+1, fib, sep=' -> ')
+
+#print(list(fibonacci_folge(30)))
+#print([i for i in fibonacci_folge(10)])
+    
\ No newline at end of file
diff --git a/Freitag/insert_all.py b/Freitag/insert_all.py
new file mode 100644
index 0000000..167d321
--- /dev/null
+++ b/Freitag/insert_all.py
@@ -0,0 +1,86 @@
+#! /usr/bin/env python3
+#
+#Benötigt python3-pymysql
+# mysql -h notebook14 -u python -pvilla inventory
+import sys
+import pymysql
+
+from utilities import hide_exception
+
+def db_connect(credentials: dict):
+    connection = pymysql.connect(**credentials)
+    return connection
+
+# Passwort aus Konfigiruationsdaten lesen
+
+
+
+def list_hosts(connection):
+    cursor = connection.cursor()
+    sql =   """
+            SELECT name, domain, address 
+            FROM hosts 
+            ORDER BY name
+            """
+    cursor.execute(sql)
+    #ermittlung cursor.fetchone() eine Zeile cursor.fetchmany() gibt vile in einer Zeile 
+    # cursor ist Iterator
+    #test = [row for row in cursor]
+    for row in cursor:
+        print("{0:20} {2:15} {2}".format(*row))
+
+def add_host(connection, args):
+    cursor = connection.cursor()
+    sql =  """
+            INSERT INTO hosts
+            (name, domain, address)
+            VALUES (%(name)s, %(domain)s, %(address)s)
+            """
+            # oder mit .format(**args) {name} usw
+    cursor.execute(sql,args)
+    connection.commit()
+
+def db_insert_into(connection, table, data):
+    columns = []
+    values = []
+    for col in data.keys():
+        col = col.replace("'", '')
+        columns.append(col)
+        values.append('%('+col+')s')
+    sql =   """
+            INSERT INTO {table}
+            ({columns})
+            VALUES ({placeholder})
+            """.format(
+                table=table, 
+                columns=','.join(columns), 
+                placeholder=','.join(values),
+                )
+    print(sql)
+
+    with connection as cursor:
+        cursor.execute(sql, data)
+
+
+
+
+#Connection
+def main():
+    credentials = dict(
+    host = 'notebook14', 
+    user = 'python',
+    password = 'villa',
+    database = 'inventory'
+)   
+    db = db_connect(credentials)
+    #list_hosts(db)
+    row = dict(
+        name='notebook999',
+        domain='linuxhotel.example',
+        address='192.168.1.254',
+    )
+    db_insert_into(db, 'hosts', row )
+    db.close()
+
+
+hide_exception(main)
\ No newline at end of file
diff --git a/Freitag/utilities.py b/Freitag/utilities.py
new file mode 100644
index 0000000..da32006
--- /dev/null
+++ b/Freitag/utilities.py
@@ -0,0 +1,27 @@
+"""
+Miscellaneous utilities
+"""
+import sys
+from traceback import format_tb
+
+def hide_exception(func):
+    try:
+        return func()
+    except Exception as e:
+        name = type(e).__name__
+        text = str(e)
+        traceback = ''.join(format_tb(e.__traceback__))
+
+        if '-V' in sys.argv:
+            print("Entwickler_Mode: wip")
+            #Für Faule Leute einfacher weiterleiten mit raise
+            #raise
+            print("{name}: {text}".format(name=name, text=text), file=sys.stderr)
+            print("Traceback:\n", traceback, sep='', file=sys.stderr)
+        else:
+            print("Interner Fehler,", e)
+
+
+if __name__ == '__main__':
+    print("from uitlities import hide_exception")
+    print("hide_exception(main)")
\ No newline at end of file