You can iterate over key-value pairs in a dictionary using a variety of methods in Python. Here are five examples:

1. Using a simple for loop:

my_dict = {'a': 1, 'b': 2, 'c': 3}

for key, value in my_dict.items():
    print(key, value)

2. Using dictionary unpacking in a for loop:

my_dict = {'a': 1, 'b': 2, 'c': 3}

for key, value in my_dict.items():
    print(key, value)

3. Using the iteritems() method (in Python 2):

my_dict = {'a': 1, 'b': 2, 'c': 3}

for key, value in my_dict.iteritems():
    print(key, value)

4. Using the iteritems() method and dictionary unpacking (in Python 2):

my_dict = {'a': 1, 'b': 2, 'c': 3}

for key, value in my_dict.iteritems():
    print(key, value)

5. Using a generator expression:

my_dict = {'a': 1, 'b': 2, 'c': 3}

key_value_pairs = ((key, value) for key, value in my_dict.items())
for key, value in key_value_pairs:
    print(key, value)

All these methods will iterate over the key-value pairs in the dictionary and allow you to perform operations on them within the loop.