22 - python & all web labs

labPython/lab22/task_1.py

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+print(
+    "task: Graf2\nПостроение матрицы инцидентности неориентированного графа по матрице смежности"
+)
+
+import random
+
+
+def create_file():
+    n = random.randint(3, 6)
+    with open("FileName1", "w") as f:
+        f.write(str(n) + "\n")
+        for i in range(n):
+            row = []
+            for j in range(n):
+                if i == j:
+                    row.append("0")
+                else:
+                    row.append(str(random.randint(0, 1)))
+            f.write(" ".join(row) + "\n")
+
+
+def read_graph():
+    try:
+        with open("FileName1") as f:
+            n = int(f.readline())
+            a = [list(map(int, f.readline().split())) for _ in range(n)]
+        return n, a
+    except:
+        return None, None
+
+
+def build_incidence(n, a):
+    edges = []
+    for i in range(n):
+        for j in range(i, n):
+            if a[i][j] != 0:
+                edges.append((i, j))
+    m = len(edges)
+    b = [[0] * m for _ in range(n)]
+    for idx, (i, j) in enumerate(edges):
+        b[i][idx] = 1
+        b[j][idx] = 1
+    return m, b
+
+
+def write_result(n, m, b):
+    with open("FileName2", "w") as f:
+        f.write(f"{n} {m}\n")
+        for row in b:
+            f.write(" ".join(map(str, row)) + "\n")
+
+
+while True:
+    print("\n1 - создать файл FileName1")
+    print("2 - выполнить задачу (результат в FileName2)")
+    print("0 - выход")
+    c = input(">> ")
+    if c == "1":
+        create_file()
+        print("FileName1 создан")
+    elif c == "2":
+        n, a = read_graph()
+        if n is None:
+            print("ошибка чтения FileName1")
+            continue
+        m, b = build_incidence(n, a)
+        write_result(n, m, b)
+        print("результат записан в FileName2")
+    elif c == "0":
+        break