diff --git a/text-file-database.py b/text-file-database.py
new file mode 100644
index 0000000..daca8e9
--- /dev/null
+++ b/text-file-database.py
@@ -0,0 +1,67 @@
+import math
+
+def insert(lines):
+    print("ID:", math.floor(len(lines)/3))
+    lines.append(input("Name: ") + " \n")
+    lines.append(input("Age: ") + " \n")
+    lines.append(input("School year: ") + " \n")
+    return lines
+
+def delete(lines):
+    id = input("ID: ")
+    for i in range(math.floor(len(lines)/3)):
+        if i == id:
+            lines.pop(i*3)
+            lines.pop(i*3)
+            lines.pop(i*3)
+    return lines
+
+def select(lines):
+    id = input("ID: ")
+    for i in range(math.floor(len(lines)/3)):
+        if i == id:
+            print("Name:", lines[id*3].strip(" \n") + ", age:", lines[id*3+1].strip(" \n") + ", school year:", lines[id*3+2].strip(" \n"))
+        else:
+            print("ID not found")
+
+def replace(lines):
+    id = input("ID: ")
+    for i in range(math.floor(len(lines)/3)):
+        if i == id:
+            print("Name:", lines[id*3] + ", age:", lines[id*3+1] + ", school year:", lines[id*3+2])
+            lines.insert(i*3, input("School year: ") + " \n")
+            lines.insert(i*3, input("Age: ") + " \n")
+            lines.insert(i*3, input("Name: ") + " \n")
+        else:
+            print("ID not found")
+    for i in range(math.floor(len(lines)/3)):
+        if i == id:
+            lines.pop(i*3)
+            lines.pop(i*3)
+            lines.pop(i*3)
+    return lines
+
+try:
+    file = open("data.txt","r+")
+except:
+    file = open("data.txt","w+")
+lines = file.readlines()
+while True:
+    for i in range(math.floor(len(lines)/3)):
+        if len(lines) > 2:
+            print("\n" + str(i) + " - name:", lines[i*3].strip(" \n") + ", age:", lines[i*3+1].strip(" \n") + ", school year:", lines[i*3+2].strip(" \n") + "\n")
+    function = input("Function (insert, i; delete, d; select, s; replace, r; exit, e): ")
+    if function.strip(" ") == "i":
+        lines = insert(lines)
+        file.writelines(lines)
+    elif function.strip(" ") == "d":
+        lines = delete(lines)
+        file.writelines(lines)
+    elif function.strip(" ") == "s":
+        select(lines)
+    elif function.strip(" ") == "r":
+        lines = replace(lines)
+        file.writelines(lines)
+    elif function.strip(" ") == "e":
+        break
+file.close()
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