Module "ImportError" at specific url path

[bhaskarSingh]

When I run window.runCode("import smartpy") at cryptocodeschool root url path it works perfectly fine.

But, when I try running the same command at a specific URL path directly ( for example https://develop.cryptocodeschool.in/tezos/lesson/module-01/chapter-15 ) it throws an error :

"Traceback (most recent call last):
  module __main__ line 212, in run
    import smartpy
ImportError: 'No module named smartpy'"

I have initialized brython using brython({ debug: 1, indexedDB: false }); command.

I have also tried using brython({ debug: 1, pythonpath: '.', hint: 'py' }); command for initialization. In this case it throws this error:

Repo link: https://github.com/buidl-labs/crypto-code-school-inside-tezos

The codebase is based on Gatsby. I don't if it's a gatsby thing or maybe I am initializing the Brython incorrectly cause it seems to work fine at the root URL but if I go to a specific URL directly it throws an error in that case.

All the related files are in the static folder and Brython is being initialized inside the gatsby-browser.js file.

I have been stuck at it for a while now and any help would be really help 🙏..

[PierreQuentel]

I just tried url https://develop.cryptocodeschool.in/tezos/lesson/module-01/chapter-15, it seems to work. Have you found the solution ?

[bhaskarSingh]

I just tried url https://develop.cryptocodeschool.in/tezos/lesson/module-01/chapter-15, it seems to work. Have you found the solution ?

Still no progress. Loom link for in-depth view: https://www.loom.com/share/3bd945bf9f2d4aad90fa78e81f4d3495

[PierreQuentel]

I see that smartpy.py is located at the root of the site. Can you put it inside /brython/Lib/site-packages instead ? Does it solve the issue ?

[bhaskarSingh]

@PierreQuentel Have a good feeling that I am very close to the solution. After updating Brython to the 3.9.0 version importModule error got resolved. Now I am getting (Javascript exception: RangeError: Maximum call stack size exceeded) error while executing the SmartPy script.

[PierreQuentel]

I would really like to help, but you don't provide enough information. Could you set up a Github repo with a minimal environment so that I can reproduce the bug locally ? It is impossible for me to debug from a browser console on a remote web site, without even knowing what you call "the SmartPy script".

[bhaskarSingh]

Context SmartPy is a language for building smart contracts on tezos blockchain which is available through a Python library.

Background context on Tezos smart contract Tezos smart contracts can be written in a variety of languages. (Michelson, LIGO, and SmartPy are the popular three) It always compiles down to Michelson no matter what source language you write them in. If you write a smart contract in SmartPy, the compiler will “convert” your code into valid Michelson before deployment to the tezos blockchain network.

What I am trying to achieve I want to integrate the SmartPy compiler which compiles the SmartPy code into the Michelson code on the frontend.

Current Blocker When using Brython 3.7.0 version, I get module "importError" at a specific URL path when using it in production codebase. Recently discovered that using Brython 3.9.0 version resolves this issue but now I am getting (Javascript exception: RangeError: Maximum call stack size exceeded) error.

Here's a minimal code example for running it locally. smartpy-demo-example(uses brython 3.9.0 version).zip smartpy-demo-example(uses brython 3.7.0 version).zip

Use python3 -m http.server 3333 command for running it locally.

Note: When using Brython 3.9.0 version which throws (Javascript exception: RangeError: Maximum call stack size exceeded) but when using Brython 3.7.0 version it works perfectly fine within the minimal working example given but throws a (module import error) when loading it at specific URL path in production.

My apologies and thank you so much for taking out your time to go over this post.

[PierreQuentel]

Thanks, I have found where the bug was. The commit referenced above should fix the issue (just replace brython.js by the latest development version), here is what I get in the output zone:

parameter (or (nat %divide) (or (unit %double) (nat %replace)));
storage   nat;
code
  {
    DUP;        # pair @parameter @storage : pair @parameter @storage
    CDR;        # @storage : pair @parameter @storage
    SWAP;       # pair @parameter @storage : @storage
    CAR;        # @parameter : @storage
    IF_LEFT
      {
        # == divide ==
        # sp.verify(params.divisor > 5) # @parameter%divide : @storage
        DUP;        # @parameter%divide : @parameter%divide : @storage
        PUSH nat 5; # nat : @parameter%divide : @parameter%divide : @storage
        COMPARE;    # int : @parameter%divide : @storage
        LT;         # bool : @parameter%divide : @storage
        IF
          {}
          {
            PUSH string "WrongCondition: params.divisor > 5"; # string : @parameter%divide : @storage
            FAILWITH;   # FAILED
          }; # @parameter%divide : @storage
        SWAP;       # @storage : @parameter%divide
        # self.data.storedValue //= params.divisor # @storage : @parameter%divide
        EDIV;       # option (pair nat nat)
        IF_SOME
          {
            CAR;        # nat
          }
          {
            PUSH int 20; # int
            FAILWITH;   # FAILED
          }; # nat
      }
      {
        IF_LEFT
          {
            DROP;       # @storage
            # == double ==
            # self.data.storedValue *= 2 # @storage
            PUSH nat 2; # nat : @storage
            MUL;        # nat
          }
          {
            SWAP;       # @storage : @parameter%replace
            DROP;       # @parameter%replace
            # == replace ==
            # self.data.storedValue = params.value # @parameter%replace
          }; # nat
      }; # nat
    NIL operation; # list operation : nat
    PAIR;       # pair (list operation) nat
  };

[bhaskarSingh]

Yes, it's working now. Thanks.

[PierreQuentel]

Cool ! I close the issue then.