String method lower() converts string to all lower case.

String method upper() converts string to all upper case. 

# Let's create a string
text = 'We are great learners'

# Convert string to all lower
print('Lower cased string: {}'.format(text.lower()))

# Convert string to all upper 
print('Upper cased string: {}'.format(text.upper()))
Lower cased string: we are great learners
Upper cased string: WE ARE GREAT LEARNERS

That's how we learned about String Cases

That’s all for this mini tutorial. To sum it up, we learned about String Cases . 

Hope it was easy, cool and simple to follow. Now it’s on you.