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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 from_file(cls, file, charset='utf-8', errors='strict', unicode_mode=True):
 """Load a template from a file. .. versionchanged:: 0.5 The encoding parameter was renamed to charset. :param file: a filename or file object to load the template from. :param charset: the charset of the template to load. :param errors: the error behavior of the charset decoding. :param unicode_mode: set to `False` to disable unicode mode. :return: a template """

        close = False
        f = file
        if isinstance(file, basestring):
            f = open(file, 'r')
            close = True
        try:
            data = _decode_unicode(f.read(), charset, errors)
        finally:
            if close:
                f.close()
        return cls(data, getattr(f, 'name', '<template>'), charset,
                   errors, unicode_mode)