@@ -685,32 +685,33 @@ \section*{Instructions}
685685\begin {itemize }
686686 \item \texttt {invert }:
687687 \begin {itemize }
688- \item Authorized functions:\texttt {None }
689- \item Authorized operator: \texttt {+ },\texttt {- }
688+ \item Authorized functions: \texttt {.copy }.
689+ \item Authorized operators: \texttt {+ },\texttt {- }, \texttt { = }.
690690 \end {itemize }
691691 \item \texttt {to\_ blue }:
692692 \begin {itemize }
693- \item Authorized functions:\texttt {.zeros },\texttt {.shape },\texttt {.dstack }
694- \item Authorized operator: \texttt {None }
693+ \item Authorized functions: \texttt {.copy }, \texttt { . zeros },\texttt {.shape },\texttt {.dstack }.
694+ \item Authorized operators: \texttt {= }.
695695 \end {itemize }
696696 \item \texttt {to\_ green }:
697697 \begin {itemize }
698- \item Authorized functions:\texttt {copy.deepcopy }
699- \item Authorized operator: \texttt {* }
698+ \item Authorized functions: \texttt {.copy }.
699+ \item Authorized operators: \texttt {* }, \texttt { = }.
700700 \end {itemize }
701701 \item \texttt {to\_ red }:
702702 \begin {itemize }
703- \item Authorized functions:\texttt {.to\_ green },\texttt {.to\_ blue }
704- \item Authorized operator: \texttt {- },\texttt {+ }
703+ \item Authorized functions: \texttt {.copy }, \texttt { . to\_ green },\texttt {.to\_ blue }.
704+ \item Authorized operators: \texttt {- },\texttt {+ }, \texttt { = }.
705705 \end {itemize }
706706 \item \texttt {to\_ celluloid(array) }:
707707 \begin {itemize }
708- \item Authorized functions:\texttt {.arange },\texttt {.linspace }
708+ \item Authorized functions: \texttt {.copy }, \texttt {.arange },\texttt {.linspace }, \texttt {.min }, \texttt {.max }.
709+ \item Authorized operators: \texttt {= }, \texttt {<= }, \texttt {> }, \texttt {\& } (or \texttt {and }).
709710 \end {itemize }
710711 \item \texttt {to\_ grayscale }:
711712 \begin {itemize }
712- \item Authorized functions:\texttt {.sum },\texttt {.shape },\texttt {.reshape },\texttt {.broadcast\_ to },\texttt {.as\_ type }
713- \item Authorized operator: \texttt {* },\texttt {/ }
713+ \item Authorized functions: \texttt {.sum },\texttt {.shape },\texttt {.reshape },\texttt {.broadcast\_ to },\texttt {.as\_ type }.
714+ \item Authorized operators: \texttt {* },\texttt {/ }, \texttt { = }.
714715 \end {itemize }
715716\end {itemize }
716717% ================================= %
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