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Since you were asking: it is quite common that modules refer
to related functionality. For example, BaseHTTPServer refers
to SimpleHTTPServer and CGIHTTPServer. One might expect that
a HTTP server also supports files and does CGI - but not
this one; go elsewhere. Likewise, module binascii refers to
modules uu and binhex. The math documentation points out
that it does not support complex numbers, and that cmath is
needed. The audioop documentation gives the function
echocancel in the documentation, instead of implementing it.