What parts don’t you understand? You can add in some print()
statements to visualize things that may be unclear:
def append_sum(lst):
print('lst[-1] is: ', lst[-1])
print('lst[-2] is: ', lst[-2])
lst.append(lst[-1] + lst[-2])
print('lst is now: ', lst)
print('lst[-1] is: ', lst[-1])
print('lst[-2] is: ', lst[-2])
lst.append(lst[-1] + lst[-2])
print('lst is now: ', lst)
print('lst[-1] is: ', lst[-1])
print('lst[-2] is: ', lst[-2])
lst.append(lst[-1] + lst[-2])
print('lst is now: ', lst)
return lst
print(append_sum([1, 1, 2]))
I didn’t understand why we used this1st[-1] + 1st[-2]
It’s lst not 1st. lst
is the parameter for the function append_sum
. The argument supplied for that parameter is found in this line:
print(append_sum([1, 1, 2]))
# argument ^^^^^^^^^
The argument is a list, so inside the function lst
is assigned to [1, 1, 2]
.
Did you try running the code I provided with the extra print()
's?
Ok I understood thanks
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