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diff --git a/advanced_python/practice_functions.tex b/advanced_python/practice_functions.tex
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-\documentclass[14pt,compress,aspectratio=169]{beamer}
-
-\input{macros.tex}
-
-\title[Practice advanced functions]{Advanced Python}
-\subtitle{Practice advanced functions}
-
-\author[FOSSEE] {The FOSSEE Group}
-
-\institute[IIT Bombay] {Department of Aerospace Engineering\\IIT Bombay}
-\date[] {Mumbai, India}
-
-\begin{document}
-
-\begin{frame}
-  \titlepage
-\end{frame}
-
-\begin{frame}[plain, fragile]
-  \frametitle{Exercise: product of all arguments}
-  \begin{block}{}
-    Write a function called \lstinline{prod} that can be called with any
-    number of arguments (at least one) but computes the product of all the
-    given values as seen below.
-  \end{block}
-
-\begin{lstlisting}
-In []: prod(2.,  2.)
-Out[]: 4.0
-
-In []: prod(1, 2, 3)
-Out[]: 6
-\end{lstlisting}
-\end{frame}
-
-\begin{frame}[plain, fragile]
-  \frametitle{Solution}
-\begin{lstlisting}
-def prod(*args):
-    res = 1.0
-    for x in args:
-        res *= x
-    return res
-
-\end{lstlisting}
-\end{frame}
-
-\begin{frame}[plain, fragile]
-  \frametitle{Another solution}
-\begin{lstlisting}
-def prod(*args):
-    res = args[0]
-    for i in range(1, len(args)):
-        res *= args[i]
-    return res
-
-\end{lstlisting}
-\end{frame}
-
-
-\begin{frame}[plain, fragile]
-  \frametitle{Exercise: function applied to arguments}
-  \begin{block}{}
-    Write a function called \lstinline{apply} which takes a function followed
-    by an arbitrary number of arguments and returns a list with the function
-    applied to all the arguments as shown below.
-  \end{block}
-
-\begin{lstlisting}
-In []: def twice(x):
-  ...:     return x*2
-
-In []: apply(twice,  1, 2)
-Out[]: [2, 4]
-
-In []: apply(twice,  1, 2, 3)
-Out[]: [2, 4, 6]
-
-\end{lstlisting}
-\end{frame}
-
-
-\begin{frame}[plain, fragile]
-  \frametitle{Solution}
-\begin{lstlisting}
-def apply(f, *args):
-    result = []
-    for arg in args:
-        result.append(f(arg))
-    return result
-\end{lstlisting}
-\end{frame}
-
-\begin{frame}[plain, fragile]
-  \frametitle{Exercise: number of kwargs}
-  \begin{block}{}
-    Write a function \lstinline{nkw} that takes an arbitrary number of
-    keyword arguments and returns the number of keyword arguments passed.
-  \end{block}
-
-\begin{lstlisting}
-In []: nkw(x=1, y=2)
-Out[]: 2
-
-In []: nkw()
-Out[]: 0
-
-In []: nkw(x=1)
-Out[]: 1
-\end{lstlisting}
-\end{frame}
-
-
-\begin{frame}[plain, fragile]
-  \frametitle{Solution}
-\begin{lstlisting}
-def nkw(**kw):
-    return len(kw)
-\end{lstlisting}
-\end{frame}
-
-\begin{frame}[plain, fragile]
-  \frametitle{Exercise: name of kwargs}
-  \begin{block}{}
-    Write a function \lstinline{kwname} that takes an arbitrary number of
-    keyword arguments and returns a sorted list of the keyword arguments
-    passed.
-  \end{block}
-
-\begin{lstlisting}
-In []: kwname(x=1, y=2)
-Out[]: ['x', 'y']
-
-In []: kwname()
-Out[]: []
-
-In []: kwname(z=1, a=2)
-Out[]: ['a', 'z']
-\end{lstlisting}
-\end{frame}
-
-
-\begin{frame}[plain, fragile]
-  \frametitle{Solution}
-\begin{lstlisting}
-def kwname(**kw):
-    return sorted(kw.keys())
-\end{lstlisting}
-\end{frame}
-
-\begin{frame}[plain, fragile]
-  \frametitle{Exercise: power function}
-  \begin{block}{}
-    Write a function called \lstinline{power} that is given a single integer
-    and returns a function that takes a single number but returns its power.
-    For example:
-  \end{block}
-
-\begin{lstlisting}
-In []: pow2 = power(2)
-In []: pow2(2)
-Out[]: 4
-In []: pow2(4)
-Out[]: 16
-
-In []: pow3 = power(3)
-In []: pow3(2)
-Out[]: 8
-\end{lstlisting}
-  Hint: this is a closure.
-\end{frame}
-
-
-\begin{frame}[plain, fragile]
-  \frametitle{Solution}
-\begin{lstlisting}
-def power(n):
-    def g(x):
-        return x**n
-    return g
-
-\end{lstlisting}
-\end{frame}
-
-
-\begin{frame}[plain, fragile]
-  \frametitle{Exercise: debug function}
-  \begin{block}{}
-    Write a function called \lstinline{debug} that takes any function as a
-    single positional argument but returns a function that first prints out
-    the arguments passed to the function before calling it and returning its
-    value. For example:
-  \end{block}
-
-\begin{lstlisting}
-In []: debug(max)(1, 2)
-(1, 2) {}
-Out[]: 2
-
-In []: import math
-
-In []: debug(math.sin)(1.0)
-(1.0,) {}
-Out[]: 0.8414709848078965
-
-\end{lstlisting}
-\end{frame}
-
-
-\begin{frame}[plain, fragile]
-  \frametitle{Solution}
-\begin{lstlisting}
-def debug(f):
-    def g(*args, **kw):
-        print(args, kw)
-        return f(*args, **kw)
-    return g
-\end{lstlisting}
-\end{frame}
-
-
-\end{document}