I'd like my dictionary to be case insensitive:

text = "practice changing the color"

words = {'color': 'colour',
        'practice': 'practise'}
    
def replace(words,text):

    keys = words.keys()

    for i in keys:
        text= text.replace(i ,words[i])
    return  text

text = replace(words,text)

print text

Output = practise changing the colour

I'd like another string, "practice changing the Color", (where Color starts with a capital) to give the same output.

I believe there is a general way to convert to lowercase using mydictionary[key.lower()] but I'm not sure how to best integrate this into my existing code.

python dictionary
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