<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def getvalue(x):
 """Return the single value of x or raise TypError if more than one value."""

    if isrepeating(x):
        raise TypeError(
            "Ambiguous call to getvalue for %r which has more than one value."
            % x)

    for value in getvalues(x):
        return value