'''
# functions list
count()
dir()
help()
max()
min()

'''

'''
help: speiga l'oggetto
es: help(len)
dir: mostra metodi e attributi dell'ogg
es: dir(len)
min(): min element of tuple
max()
L.count('n'): count occurrencies of 'n' in L
L.index('val'): returns index of first 'val' occurrency in L
'''

'''
# list functions (they work cos lists are made of mutable elements)

# they all do side effect on the invok obj, except for 'copy()'
append()
extend()
insert()
pop()
remove(el)
sort()
reverse()
copy()
clear()
'''