Please explain this for me

[Emeka]

Hello All,

v = []

def add_to_list(plist):
    u = plist.append(90)
    return u

add_to_list(v)  # This function call returns nothing
Could someone explain why this function call will return nothing?

v = [90] # Object values are passed by reference
This one is clear to me

add_to_list([])
This one returns nothing, why?

Regards,
Emeka
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