Must have equal len keys and value when setting with an iterable

In Python, when setting the values of a dictionary using an iterable (iterable is any object capable of returning its members one at a time), it is necessary for the keys and values to have equal length.

This means that if you are using a function like zip() to combine two lists into a dictionary, the length of both lists must be the same. Otherwise, you will get a ValueError: dictionary update sequence element # has length M; 2 is required error.

Here is an example to illustrate this:

    
      list1 = ['apple', 'banana', 'orange']
      list2 = [5, 3, 2, 1]
      
      dictionary = dict(zip(list1, list2))
      print(dictionary)
    
  

In this example, list1 has 3 elements and list2 has 4 elements. When we try to combine them using zip(), we get a ValueError because the lengths are not equal:

    
      ValueError: dictionary update sequence element # has length 4; 2 is required
    
  

To resolve this error, make sure that the lengths of both the keys and values are equal. In this case, we can either remove an element from list2 or add an extra element to list1 to make them both have the same length.