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+# Python len(x)
+
+`len()` is a built-in function in Python 3. This method returns the length (the number of items) of an object. It takes one argument `x`. 
+
+## Arguments
+
+It takes one argument, `x`. This argument may be a sequence (such as a string, bytes, tuple, list, or range) or a collection (such as a dictionary, set, or frozen set).
+
+## Return Value
+
+This function returns the number of elements in the argument which is passed to the `len()` function.
+
+## Code Sample
+
+```python
+list1 = [123, 'xyz', 'zara'] # list
+print(len(list1)) # prints 3 as there are 3 elements in the list1
+
+str1 = 'basketball' # string
+print(len(str1)) # prints 10 as the str1 is made of 10 characters
+
+tuple1 = (2, 3, 4, 5) # tuple 
+print(len(tuple1)) # prints 4 as there are 4 elements in the tuple1
+
+dict1 = {'name': 'John', 'age': 4, 'score': 45} # dictionary
+print(len(dict1)) # prints 3 as there are 3 key and value pairs in the dict1
+```
+
+:rocket: [Run Code](https://repl.it/CUmt/15)
+
+[Official Docs](https://docs.python.org/3/library/functions.html#len)