new tip, slight edit on another one

index.md

@@ -484,6 +484,10 @@ This file gets generated by [this script](index.py).
 
 - [Faster page downloads](notes/20230110130247.md)
 
+## Timeit
+
+- [Timing code in python](notes/20240726111622.md)
+
 ## Tips'])
 
 - [Dataclass with extra construction](notes/20240223145038.md)

notes/20240726111223.md

@@ -1,6 +1,6 @@
 # You can now use | for typing
 
-`|` got added to type hints >= 3.10, not needing the `typing` import anymore:
+`|` got added to type hints >= 3.10, not needing the `typing` import anymore for these:
 
 - Unions can now be written as `X | Y`
 - Optional can now be written as `X | None`

notes/20240726111622.md

@@ -0,0 +1,27 @@
+# Timing code in Python
+
+Using `timeit` to compare merging dictionaries in #Python: Old way with `**` unpacking vs. new way with `|`.
+
+`timeit` runs the code 1000 times, using `globals` to pass variables, and prints the timing results:
+
+```
+import timeit
+
+dict1 = {f'key{i}': i for i in range(10000)}
+dict2 = {f'key{i}': i for i in range(5000, 15000)}
+
+old_way_time = timeit.timeit('''
+merged_dict = {**dict1, **dict2}
+''', globals=globals(), number=1000)
+
+new_way_time = timeit.timeit('''
+merged_dict = dict1 | dict2
+''', globals=globals(), number=1000)
+
+print(f"Old way time: {old_way_time:.6f} seconds")
+print(f"New way time: {new_way_time:.6f} seconds")
+# Old way time: 0.222962 seconds
+# New way time: 0.222384 seconds
+```
+
+#timeit