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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 template_substitute(text, **kwargs):
 """ Replace placeholders in text by using the data mapping. Other placeholders that is not represented by data is left untouched. :param text: Text to search and replace placeholders. :param data: Data mapping/dict for placeholder key and values. :return: Potentially modified text with replaced placeholders. """

    for name, value in kwargs.items():
        placeholder_pattern = "{%s}" % name
        if placeholder_pattern in text:
            text = text.replace(placeholder_pattern, value)
    return text