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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def camelize(key):
 """Convert a python_style_variable_name to lowerCamelCase. Examples -------- 'variableName' 'variableName' """

    return ''.join(x.capitalize() if i > 0 else x
                   for i, x in enumerate(key.split('_')))