From fecf7c747fbb04d1fb34524362b20ce3e554ec11 Mon Sep 17 00:00:00 2001
From: Thore <2120752@stud.hs-mannheim.de>
Date: Sat, 5 Nov 2022 15:33:32 +0100
Subject: [PATCH] init

---
 s1_a4.py    |  9 +++++++++
 s1_a51.py   | 26 ++++++++++++++++++++++++++
 s1_a53_6.py | 38 ++++++++++++++++++++++++++++++++++++++
 s1_a61_2.py | 13 +++++++++++++
 4 files changed, 86 insertions(+)
 create mode 100644 s1_a4.py
 create mode 100644 s1_a51.py
 create mode 100644 s1_a53_6.py
 create mode 100644 s1_a61_2.py

diff --git a/s1_a4.py b/s1_a4.py
new file mode 100644
index 0000000..e29f4dc
--- /dev/null
+++ b/s1_a4.py
@@ -0,0 +1,9 @@
+import math
+if __name__ == "__main__":
+    row_value = round(math.pi**2/6, 6)  # = 1.644934
+    sum_of_reciprocal_squares = 0
+    divider = 1
+    while row_value != round(sum_of_reciprocal_squares, 6):
+        sum_of_reciprocal_squares += 1/divider**2
+        divider += 1
+    print("After adding the first " + str(divider-1) + " reciprocal square numbers the sum equals " + str(round(sum_of_reciprocal_squares, 6)))
diff --git a/s1_a51.py b/s1_a51.py
new file mode 100644
index 0000000..9b9bf30
--- /dev/null
+++ b/s1_a51.py
@@ -0,0 +1,26 @@
+import numpy as np
+from scipy import sparse
+
+if __name__ == "__main__":
+    # Aufgabe 1b
+    input_matrix = [[3, 0, -2, 11],
+                    [0, 0, 9, 0],
+                    [0, 7, 0, 0],
+                    [0, 0, 0, 0]]
+    sparse_matrix = []
+    for row in range(len(input_matrix)):
+        for column in range(len(input_matrix[0])):
+            if input_matrix[row][column] != 0:
+                # Aufgabe 1d
+                print("Index: ["+str(row)+"]"+"["+str(column)+"] = "+str(input_matrix[row][column]))
+                triplet = [row, column, input_matrix[row][column]]  # saving index of not null values
+                sparse_matrix.append(triplet)
+
+    # Aufgabe 1c
+    print("\nThe sparce matrix computed without numpy\n" + str(sparse_matrix))
+
+    # faster way with numpy
+    input_matrix = np.array(input_matrix)
+    rows, columns = input_matrix.shape
+    sparse_matrix = sparse.csr_matrix(input_matrix)
+    print("\nThe sparce matrix computed with numpy\n" + str(sparse_matrix))
diff --git a/s1_a53_6.py b/s1_a53_6.py
new file mode 100644
index 0000000..bd797ec
--- /dev/null
+++ b/s1_a53_6.py
@@ -0,0 +1,38 @@
+if __name__ == "__main__":
+    # Aufgabe 3
+    numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
+    for i in range(0, 3):
+        numbers.insert(0, numbers.pop())
+    print(numbers)
+
+
+    # Aufgabe 4
+    def split_chars_and_remove_duplicates(word: str):
+        string_list = list(word)
+        print("Length of the string-list with duplicates: " + str(len(string_list)))
+        string_set = set(string_list)
+        string_list = list(string_set)
+        string_list.sort()
+        print("Length of the string-list without duplicates: " + str(len(string_list)))
+        print(string_list)
+
+    string = "Donaudampfschiffahrtsgesellschaftsstewardess"
+    split_chars_and_remove_duplicates(string)
+
+    # Aufgabe 5
+    list_to_sort = [[1, 2, 3], [2, 1, 3], [4, 0, 1]]
+    for row in range(len(list_to_sort)):
+        for next_row in range(row + 1, len(list_to_sort)):
+            if list_to_sort[row][1] > list_to_sort[next_row][1]:
+                tmp = list_to_sort[row]
+                list_to_sort[row] = list_to_sort[next_row]
+                list_to_sort[next_row] = tmp
+
+    print("The sorted list" + str(list_to_sort))
+
+    # Aufgabe 6
+    def get_the_animal_sound(name_of_animal: str):
+        animal_dictionary = {"Lion": "Growl!", "Dog": "Barks!", "Cat": "Meow!"}
+        return animal_dictionary.get(name_of_animal, "Animal sound not available")
+
+    print(get_the_animal_sound("Dog"))
diff --git a/s1_a61_2.py b/s1_a61_2.py
new file mode 100644
index 0000000..c5c9f95
--- /dev/null
+++ b/s1_a61_2.py
@@ -0,0 +1,13 @@
+if __name__ == "__main__":
+    # Aufgabe 6.1
+    string_with_spaces = "This is a test"
+    string_with_dashes = string_with_spaces.replace(" ", "-")
+    print(string_with_dashes)
+
+    # Aufgabe 6.2
+    s1 = "Hello, World"
+    tmp = ""
+    for current_char in range(s1.find(","), -1, -1):
+        tmp += s1[current_char]
+    s1 = tmp
+    print(s1)