human
Solve the following python programming problem given the following code:
# Missing tail call optimization... :(

def fib_recursion(num):
    if num < 2:
        return num
    return fib_recursion(num-1) + fib_recursion(num-2)

def fib_tail_recursion(num, res=0, temp=1):
    if num == 0:
        return res
    else:
        return fib_tail_recursion(num-1, temp, res + temp)

def fib_circle(num):
    a = 0
    b = 1
    for i in range(1, num):
        c = a + b
        a = b
        b = c
    return c

i = 5000
for fn in [fib_recursion, fib_tail_recursion, fib_circle]:
    try:
        result = fn(i)
        print(f"{fn.__name__}({i}) = {result}")
    except RecursionError as e:
        print(f"{fn.__name__}({i}) = :( {e}")

# Datetime: Aware and Naive Objects :(

from datetime import datetime, timezone

print(datetime.now())
print(datetime.utcnow()) # <- No timezone info here

print(datetime.utcnow().replace(tzinfo=timezone.utc))

# It's not a big deal, but...

class A:
    def __init__(self):
        self.x = "foo"
    
    def method_a(what):
        print(f"What a {what.x}")
        
    def method_b(not_important_how_you_name_this_argument):
        print(f"What a {not_important_how_you_name_this_argument.x}")
        
    def method_c():
        print(f"Why we don't have a {self} here by default.")
        
a = A()
a.method_a()
a.method_b()
a.method_c()
Given the above code, generate some markdown instructions for it.
assistant
#Here a {what.

Thing's I don't like