Add 'for' VS 'in' examples

Author: DevCTx

useful_samples/for_vs_in.py

@@ -0,0 +1,45 @@
+'''
+    for_vs_in : shows the differences of complexity to solve a single problem by 4 different ways
+    better to use 'in' than to make a test on for iteration
+'''
+import random
+import time
+
+n=1000
+list_1 = [random.randint(0,1000) for _ in range(n) ]
+list_2 = [random.randint(0,1000) for _ in range(n) ]
+set_1 = set(list_1)
+set_2 = set(list_2)
+
+start = time.time()
+nb = 0
+for i in list_1:
+    for j in list_2:
+        if i+j == 1000 :
+            nb += 1
+print( time.time()-start, nb)
+
+start = time.time()
+nb = 0
+for i in list_1:
+    j = 1000 - i
+    if j in list_2 :
+        nb += 1
+print( time.time()-start, nb)
+
+start = time.time()
+nb = 0
+for i in set_1:
+    for j in set_2:
+        if i+j == 1000 :
+            nb += 1
+print( time.time()-start, nb)
+
+start = time.time()
+nb = 0
+for i in set_1:
+    j = 1000 - i
+    if j in set_2 :
+        nb += 1
+print( time.time()-start, nb)
+