Provide examples of using the map function in Python.

The map(function, iterable, ...) function applies a function to all items of an iterable and returns an iterator with the results.

Examples:

1. Applying a function to each element of a list:

   # Squares each number
   numbers = [1, 2, 3, 4, 5]
   squared_numbers = list(map(lambda x: x**2, numbers))
   # Result: [1, 4, 9, 16, 25]
   

2. Applying a function to elements of multiple iterables:

   # Adds corresponding elements of two lists
   list1 = [1, 2, 3]
   list2 = [4, 5, 6]
   sum_list = list(map(lambda x, y: x + y, list1, list2))
   # Result: [5, 7, 9]
   

3. Converting strings to numbers:

   # Converts list of strings to integers
   str_numbers = ['10', '20', '30']
   int_numbers = list(map(int, str_numbers))
   # Result: [10, 20, 30]
   

4. Applying string methods:

   # Converts all strings to uppercase
   words = ['apple', 'banana', 'cherry']
   uppercase_words = list(map(str.upper, words))
   # Result: ['APPLE', 'BANANA', 'CHERRY']
   

5. Using with a custom function:

   # Custom function
   def process_item(item):
       return item * 2 + 1
   
   data = [10, 20, 30]
   processed_data = list(map(process_item, data))
   # Result: [21, 41, 61]