How to convert Python dictionary keys/values to lowercase?

You can convert Python dictionary keys/values to lowercase by simply iterating over them and creating a new dict from the keys and values. For example,

def lower_dict(d):
   new_dict = dict((k.lower(), v.lower()) for k, v in d.items())
   return new_dict
a = {'Foo': "Hello", 'Bar': "World"}
print(lower_dict(a))

This will give the output

{'foo': 'hello', 'bar': 'world'}

If you want just the keys to be lower cased, you can call lower on just that. For example,

def lower_dict(d):
   new_dict = dict((k.lower(), v) for k, v in d.items())
   return new_dict
a = {'Foo': "Hello", 'Bar': "World"}
print(lower_dict(a))

This will give the output

{'foo': 'Hello', 'bar': 'World'}

Arjun Thakur

Updated on 17-Jun-2020 11:05:23

• Related Questions & Answers
• How to insert new keys/values into Python dictionary?
• How to create Python dictionary from list of keys and values?
• How to convert Javascript dictionary to Python dictionary?
• How to split Python dictionary into multiple keys, dividing the values equally?
• Keys associated with Values in Dictionary in Python
• Append Dictionary Keys and Values (In order ) in dictionary using Python
• How to create Python dictionary with duplicate keys?
• Python – Limit the values to keys in a Dictionary List
• Find keys with duplicate values in dictionary in Python
• Python - Combine two dictionary adding values for common keys
• Convert key-values list to flat dictionary in Python
• How to add new keys to a dictionary in Python?
• How to sort a dictionary in Python by keys?
• Convert string dictionary to dictionary in Python
• How does Python dictionary keys() Method work?