Lowercase in Python

Question

How can you convert a string to lowercase or upper case?
For example, I want to convert the below string in upper case. What should I do?

s= "Python is best"

Answer 1

You can simply the built-in function in python: lower() and upper()
Fr example:
s="Python is best"
print(s.upper())
print(s.lower())

Output:

PYTHON IS BEST
python is best

Answer 2

s = "Kilometer"
print(s.lower())

The official documentation is str.lower().

Answer 3

With Python 2, this doesn't work for non-English words in UTF-8. In this case decode('utf-8') can help:

>>> s='ALpHabet'
>>> print s.lower()
alphabet
>>> print s.decode('utf-8').lower()
alphabet

Answer 4

The canonical Pythonic way of doing this is

>>> 'Kilometers'.lower()
'kilometers'

However, if the purpose is to do case insensitive matching, you should use case-folding:

>>> 'Kilometers'.casefold()
'kilometers'

Here's why:

>>> "Maße".casefold()
'masse'
>>> "Maße".lower()
'maße'
>>> "MASSE" == "Maße"
False
>>> "MASSE".lower() == "Maße".lower()
False
>>> "MASSE".casefold() == "Maße".casefold()
True

Answer 5

if you want the user to input something you could do the below code:

raw_input('Type Something').lower()

It will then automatically convert the string they typed into lowercase.

Note: raw_input was renamed to input in Python 3.x and above.

Answer 6

s = input('UPPER CASE')
lower = s.lower()

If you use like this:

s = "Kilometer"
print(s.lower())     - kilometer
print(s)             - Kilometer

It will work just when called.