Pyton-2

008

Lists

# Lists
# array von 1 bis 42
lottozahlen = list(range(1, 43))
print(lottozahlen)

009

Lottozahlen generieren

# Zufallszahlen
import random


def my_print(output):
    print(output)
    print("********")


# range from 1 to 42 / random.sample gives unique elements
lottozahlen = random.sample(range(1, 43), 6)
my_print(lottozahlen)
lottozahlen.sort()
my_print(lottozahlen)
totelemente = len(lottozahlen)
my_print(totelemente)
i = 1
while i <= totelemente:
    print(f"zahl {i}  {lottozahlen[i - 1]}")
    i += 1

010

Reverse String

# reverse a string
def reverse_string(my_string):
    # uppercase the string
    upper_string = my_string.upper()
    # reverse it with slice
    reversed = upper_string[::-1]
    # how many chars in string?
    tot_chars = len(reversed)
    i = 0
    # loop through all chars
    while i < tot_chars:
        print(reversed[i])
        i += 1


my_string = "Das ist ein Satz."
reverse_string(my_string)

my_string = "Yet another one."
reverse_string(my_string)

011

einfacher for-loop

# simple for loop
teams = ["FCZ", "GC", "YF", "Red Star"]
teams.sort()
for team in teams:
    print(team)

012

Wörter mit mindestens n Zeichen ausgeben und zählen

# check word length
def count_word(words, min_word_length):
    i = 0
    for word in words:
        if len(word) >= min_word_length:
            print(word)
            i = i + 1
    print(f"Total Wörter mit mindestens {min_word_length} Zeichen: {i}")
    return i


n = 0  # Gesamttotal aller Wörter
cities = ["Basel", "Bern", "Lausanne", "Zug", "Lugano", "Zürich", "St. Gallen"]
countries = ["Schweiz", "Deutschland", "Italien", "Frankreich"]
n = n + count_word(cities, 6)
print(f"%%%% Total: {n}")
n = n + count_word(countries, 8)
print(f"%%%% Total: {n}")

013

Dictionaries

# dictionaries
nam2nick = {}
nam2nick["Frankreich"] = "F"
nam2nick["Schweiz"] = "CH"

print(nam2nick["Frankreich"])
print(nam2nick["Schweiz"])

# loop through
for my_key, my_value in nam2nick.items():
    print(my_key + " : " + my_value)

# or
inventory = {
    " apples ": 430,
    " bananas ": 312,
}
print(inventory[" apples "])

# loop through
for my_key, my_value in inventory.items():
    print(f"{my_key} : {my_value}")

# only print keys
for fruit in inventory.keys():
    print(fruit)

# only print values
for value in inventory.values():
    print(value)

014

Punktzahl eingeben und danach die Note berechnen

# Noten berechnen
def calculate_mark(points, max_points):
    mark = (points * 5 / max_points) + 1
    return mark


# max value
max_points = float(14)
# loop through input until "exit" is entered
while True:
    points = input("how many points?")
    if points.lower() == "exit":
        break
    # check if number within a range is given
    try:
        float(points)
        points = float(points)
        if points > max_points:
            print(f"max points is {max_points} - you entered {points}. Try again!")
        else:
            points = float(points)
            mark = calculate_mark(points, max_points)
            # round to nearst 0.5
            mark_final = round(mark * 2) / 2
            print(mark)
            print(mark_final)
    except ValueError:
        print("Not a float. Enter a number.")

015

Noten berechnen. Speichern der Daten in einem dictionary.

# Noten berechnen
def calculate_mark(points, max_points):
    mark = (points * 5 / max_points) + 1
    return mark


# max value
max_points = float(14)
# dictionaries
studi_points = {}
# loop through input until "exit" is entered
while True:
    student = input("student name or exit to quit: ")
    if student.lower() == "exit":
        break
    points = input("how many points? ")
    studi_points[student] = points
    # check if number within a range is given
    try:
        float(points)
        points = float(points)
        if points > max_points:
            print(f"max points is {max_points} - you entered {points}. Try again!")
        else:
            points = float(points)
            mark = calculate_mark(points, max_points)
            # round to nearst 0.5
            mark_final = round(mark * 2) / 2
    except ValueError:
        print("Not a float. Enter a number.")

for my_key, my_value in studi_points.items():
    print(f"{my_key} : {my_value}")

016

Datei Operationen - Zeilen hinzufügen, Datei ausgeben

# files
# write to a file - append
import time

start_time = time.time()
i = 1

# write a few lines with timestamp
with open("einedatei2.txt", "a") as file:
    while i <= 10:
        file.write(f"hallo {i} - {time.time()}\n")
        i += 1

# read the file
with open("einedatei2.txt", "r") as file:
    for line in file.readlines():
        # to omit the newline in the file
        line = line.strip()
        print(line)
    # how many lines in file?
    file.seek(0)
    lines = file.read()
    count = lines.splitlines()
    print(f"Total lines in file: {len(count)}")