<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def getchar(echo=False):
 """Fetches a single character from the terminal and returns it. This will always return a unicode character and under certain rare circumstances this might return more than one character. The situations which more than one character is returned is when for whatever reason multiple characters end up in the terminal buffer or standard input was not actually a terminal. Note that this will always read from the terminal, even if something is piped into the standard input. Note for Windows: in rare cases when typing non-ASCII characters, this function might wait for a second character and then return both at once. This is because certain Unicode characters look like special-key markers. .. versionadded:: 2.0 :param echo: if set to `True`, the character read will also show up on the terminal. The default is to not show it. """

    f = _getchar
    if f is None:
        from ._termui_impl import getchar as f
    return f(echo)