Previously interested programmers who only downloaded the iPython notebook had to download your specific input data separately (or download their own inputs). With this fix the input files are downloaded from your Github repository as soon as Input(day) is called.

Hello,

I'm trying to use 'How to Do Things with Words' notebook but...

NameError Traceback (most recent call last) in () ----> 1 TEXT = file('big.txt').read() 2 len(TEXT)

NameError: name 'file' is not defined

• I think this should be replaced to use open() instead of file().

• I was able to use 'big.txt' downloading from https://norvig.com/big.txt .Not sure if its the same.

I'll upload a PR to make it py3 compatible.

Hi, missing input folder data/advent2018 in repository Alessio

input1 = Input(1, int)

sum(input1)

FileNotFoundError Traceback (most recent call last) in ----> 1 input1 = Input(1, int) 2 3 sum(input1)

in Input(day, line_parser, file_template) 18 def Input(day, line_parser=str.strip, file_template='data/advent2018/input{}.txt'): 19 "For this day's input file, return a tuple of each line parsed by line_parser." ---> 20 return mapt(line_parser, open(file_template.format(day))) 21 22 def integers(text):

FileNotFoundError: [Errno 2] No such file or directory: 'data/advent2018/input1.txt'

Hi,

This function is always throwing an error.

def load_counts(filename, sep='\t'): """Return a Counter initialized from key-value pairs, one on each line of filename.""" C = Counter() for line in open(filename): key, count = line.split(sep) C[key] = int(count) return C

Sometimes it is throwing an error of this type:- Error is in line --> 168 C[key].append(int(count))

and error is--> TypeError: unhashable type: 'list'

And sometimes:- --> 167 key, count = line.split(sep)

ValueError: not enough values to unpack (expected 2, got 1)

I can't find the reason.Please help.I am using Python3 and have edited everything related to Python3 in this program.Please let me know the reason of above errors.

for example , just input "hello wolrd" after call repl()

"hello world" will be splitted to two tokens like ("hello) and (world"). it should be treated as one single string expression, not two tokens, otherwise "hello will be thought as an operator, but it can not be found from environment.

Below is my test log:

lis.py> "hello world" Traceback (most recent call last): File "", line 1, in File "/home/klose/Documents/programming/python/intepreter/lis.py", line 98, in repl val = eval(parse(raw_input(prompt))) File "/home/klose/Documents/programming/python/intepreter/lis.py", line 123, in eval return env.find(x)[x] File "/home/klose/Documents/programming/python/intepreter/lis.py", line 89, in find return self if (var in self) else self.outer.find(var) AttributeError: 'NoneType' object has no attribute 'find'

Last time I only added the BASIC and Cheryl notebook to the notebooks that are evaluated in Travis, now added all notebooks in the ipynb folder...

While testing on my local computer some notebooks did not fully run. If this is appreciated I might have some time to look into the possible issues next week. Let me know if this is something you want!

I think it would be good to create a copy of M within the run and run2 functions to avoid mutating the list that is passed in - it worked out fine since you created the input each time, but it would have gone wrong if you had only created it once.

@norvig, you have Advent of Code 2020 notebooks and you have Advent of Code 2021 notebooks (if you believe the hyperlink text, anyway), but following the links to the mentioned notebooks reveals that everything leads to the one and only Advent of Code 2020.

There aren't any real Advent of Code 2021 notebooks, are there, Peter? Is this an early April Fools' Day prank maybe?

From the linked Wikipedia-article: "In probability theory, an event is a set of outcomes of an experiment (a subset of the sample space) to which a probability is assigned."

I believe this formulation is clearer than previous.

Perhaps, there's a typo in the number of possibilities here: https://github.com/norvig/pytudes/blame/master/ipynb/Countdown.ipynb#L58

It might be meant to be the other way around 4^9 = 262,144 instead of 9^4.

Thought it would be interesting to not only have a population perspective but also an individual one. MR adds the wealth of a random population member as it varies through time to the percentile plot.

Hello,

It is possible to significantly and cheaply improve the rendering of the figures of the A Chaos Game with Triangles notebook by using transparency, smaller marker size and a some oversampling:

def show_walk(vertexes, N=5000):
    "Walk halfway towards a random vertex for N points; show reults."
    Xs, Ys = transpose(random_walk(vertexes, N))
    Xv, Yv = transpose(vertexes)
    plt.plot(Xs, Ys, 'r.', alpha=0.5, markersize=1)
    plt.plot(Xv, Yv, 'bs', clip_on=False)
    plt.gca().set_aspect('equal')
    plt.gcf().set_size_inches(9, 9)
    plt.axis('off')
    plt.show()

Let M = 2315 (total number of possible answers) and n = the size of bin for pattern n.

In the original version

P(Guess in 2) = 1/M * Sum(Prob(Guess in 2 | Pattern))
              = 1/M * Sum(1 / n) 

But, by Total Probability, I believe the formula should be:

P(Guess in 2) = Sum(Prob(Guess in 2 | Pattern) * P(Pattern))
              = Sum(1 / n * n / M)
              = 1 / M * Sum(1)

The result is counter-intuitive to me, but the probability of a guess in 2 only depends on the number of (non-empty) bins/partitions that are created from a guess.

Credit to @fitzme for help verifying the math.

Hi,

I have extended your & John Cook's work on this topic using fractional steps and wanted to share that. There is a 'chaotic' puzzle to this when the fractional step is -1 and could be an interesting topic in itself:

https://github.com/cdragun/python-progs/blob/master/Sierpinski.ipynb

Regards, Chandra