Python string find() and rfind() examples

Python-3/basic_examples/strings/string_find.py

@@ -0,0 +1,30 @@
+s = 'abcd1234dcba'
+
+print(s.find('a'))
+print(s.find('cd'))
+print(s.find('1', 0, 5))
+print(s.find('1', 0, 2))
+
+print(s.rfind('a'))
+print(s.rfind('a', 0, 20))
+print(s.rfind('cd'))
+print(s.rfind('1', 0, 5))
+print(s.rfind('1', 0, 2))
+
+
+def find_all_indexes(input_str, search_str):
+    l1 = []
+    length = len(input_str)
+    index = 0
+    while index < length:
+        i = input_str.find(search_str, index)
+        if i == -1:
+            return l1
+        l1.append(i)
+        index = i + 1
+    return l1
+
+
+s = 'abaacdaa12aa2'
+print(find_all_indexes(s, 'a'))
+print(find_all_indexes(s, 'aa'))