update

docs/index.md

@@ -373,7 +373,32 @@ else:
 
 ### Exercise 17
 
-Counting the occurrence of an item in a list
+Create a list with random numbers. Count the occurrence of each item in the list and store the result in a dictionary.
+
+<details markdown=block>
+<summary markdown=span>Click here to see a possible solution</summary>
+
+```python
+import random
+
+my_list = []
+
+for i in range(0,100):
+    my_list.append(random.randint(0,10))
+
+# Create an empty dictionary to store the counts
+element_count = {}
+
+# Iterate through the list and count occurrences
+for element in my_list:
+    if element in element_count:
+        element_count[element] += 1
+    else:
+        element_count[element] = 1
+
+print(element_count)
+```
+</details>
 
 ### Exercise 18
 

set_1/ex17.py

@@ -0,0 +1,21 @@
+# Create a list with random numbers.
+# Count the occurrence of each item in the list and store the result in a dictionary
+
+import random
+
+my_list = []
+
+for i in range(0,100):
+    my_list.append(random.randint(0,10))
+
+# Create an empty dictionary to store the counts
+element_count = {}
+
+# Iterate through the list and count occurrences
+for element in my_list:
+    if element in element_count:
+        element_count[element] += 1
+    else:
+        element_count[element] = 1
+
+print(element_count)

set_1/ex18.py

@@ -0,0 +1,8 @@
+# Checking if a file exists
+
+import os
+
+if os.path.isfile("file.txt"):
+    print("File exists!")
+else:
+    print("File does not exists!")

set_1/ex19.py

@@ -0,0 +1,8 @@
+# Checking if a file exists
+
+import os
+
+if os.path.isfile("file.txt"):
+    print("File exists!")
+else:
+    print("File does not exists!")

set_1/ex20.py

@@ -0,0 +1,8 @@
+# Checking if a file exists
+
+import os
+
+if os.path.isfile("file.txt"):
+    print("File exists!")
+else:
+    print("File does not exists!")