Precisely, stetim.

And, uh, let's say I have built a reputation elsewhere for juggling with an insane number of instructions into my (un)famous one-liners solutions

Like this:

`function_for_a_kata_will_not_name=lambda c: lambda p,t: (lambda i,n: 'Invalid present value' if p<0 else 'Invalid duration' if t%1!=0 else 'Invalid rate frequency' if n==None else 'Invalid interest rate' if i==None else round(p*((1+i/n)**(n*(t-(t%(1/n) if n<1 else 0)))-1),2))(float(c["rate"][:-1])/100 if (lambda r: len(r)>1 and r[-1]=="%" and r.count(".")<=1 and all(x in "0123456789" for x in r.replace(".","").replace("%","")))(c["rate"]) else None,{"daily":365, "weekly":52, "monthly":12, "quarterly":4, "annually":1, "biennially":0.5}[c["frequency"]] if c["frequency"] in ['daily', 'weekly', 'monthly', 'quarterly', 'annually', 'biennially'] else None)`

Believe it or not, this stuff is a single line that works to solve a given problem and is EXCELLENT practice to improve your skills

So, is this complicated enough for you ? I hope so