“… I thought of that old joke, y’know, the, this… this guy goes to a psychiatrist and says, “Doc, uh, my brother’s crazy; he thinks he’s a chicken.” And, uh, the doctor says, “Well, why don’t you turn him in?” The guy says, “I would, but I need the eggs…”
— Annie Hall (1977) by Woddy [...]
Web-Safe Arithmetic Expressions Evaluator
import math
import re
whitelist = ‘|’.join(
# oprators, digits
['-', '\+', '/', '\\', '\*', '\^', '\*\*', '\(', '\)', '\d+']
# functions of math module (ex. __xxx__)
+ [f for f in dir(math) if f[:2] != ‘__’])
valid = lambda exp: re.match(whitelist, exp)
>>> [...]
First they ignore you.
Then they laugh at you.
Then they fight you.
Then you win.
MK Gandhi
Python is so beautiful and elegant
See this:
def fib():
a, b = 0, 1
while 1:
yield b
a, b = b, a+b
if __name__ == ‘__main__’:
f = fib()
for [...]
Revenge of the Nerds yielded a collection of canonical solutions to the same problem in a number of languages.
The problem: Write a function foo that takes a number n and returns a function that takes a number i, and returns n incremented by i.
Note: (a) that’s number, not integer, (b) that’s incremented by, not plus.
… and I thought this method of raising errors belongs to the far past of web development…
