Importing modules does not work

[certik]

$ tree      
.
├── a
│   ├── __init__.py
│   └── b.py
└── r.py

1 directory, 3 files
$ cat a/b.py 
def f():
    print("b.f() called")
$ cat r.py 
from a.b import f
f()

This gives:

$ lpython r.py 
semantic error: Could not find the module '__init__.py'. If an import path is available, please use the `-I` option to specify it
 --> r.py:1:1
  |
1 | from a.b import f
  | ^^^^^^^^^^^^^^^^^ 


Note: if any of the above error or warning messages are not clear or are lacking
context please report it to us (we consider that a bug that needs to be fixed).
$ lpython -I . r.py
semantic error: Could not find the module '__init__.py'. If an import path is available, please use the `-I` option to specify it
 --> r.py:1:1
  |
1 | from a.b import f
  | ^^^^^^^^^^^^^^^^^ 


Note: if any of the above error or warning messages are not clear or are lacking
context please report it to us (we consider that a bug that needs to be fixed).

[certik]

@Thirumalai-Shaktivel any idea why this does not work?

[Thirumalai-Shaktivel]

Currently, we don't support

from a.b import f

Instead, this works:

from a import f

$ lpython r.py
b.f() called

I will try to work on this soon.

[Thirumalai-Shaktivel]

Fixed here: #1306

[certik]

Ok, the above now works with #1306, but more deeply nested doesn't:

$ tree a
a
├── __init__.py
├── b.py
└── c
    ├── __init__.py
    └── d.py
(lf) repos/lpython(nested_modules_02) $ cat a/c/d.py 
def g():
    print("a.c.g() called")
(lf) repos/lpython(nested_modules_02) $ cat r.py 
from a.b import f
f()
from a.c.d import g
g()
(lf) repos/lpython(nested_modules_02) $ python r.py 
b.f() called
a.c.g() called
(lf) repos/lpython(nested_modules_02) $ lpython r.py
semantic error: Could not find the module 'a/c.d.py'. If an import path is available, please use the `-I` option to specify it
 --> r.py:3:1
  |
3 | from a.c.d import g
  | ^^^^^^^^^^^^^^^^^^^ 


Note: if any of the above error or warning messages are not clear or are lacking
context please report it to us (we consider that a bug that needs to be fixed).

[Thirumalai-Shaktivel]

Fixed here: #1315

[certik]

I think it works now!

I can't think of any case that doesn't work, so I am going to close this issue as fixed. If we discover more things that don't work, I'll open a new issue.

@Thirumalai-Shaktivel, @czgdp1807 are we ready now to start making Python packages that compile with LPython?

[Thirumalai-Shaktivel]

I came across another issue that doesn't work yet. Like for this example:

import test_import

def test():
    print(test_import.print_a())
    print(test_import.print_b())
    print(test_import.print_c())

test()

Error:

lpython integration_tests/test_import_01.py
Internal Compiler Error: Unhandled exception
Traceback (most recent call last):
  Binary file "/home/thirumalai/Open_Source/lpython/src/bin/lpython", in _start()
  File "./csu/../csu/libc-start.c", line 392, in __libc_start_main_impl()
  File "./csu/../sysdeps/nptl/libc_start_call_main.h", line 58, in __libc_start_call_main()
  File "/home/thirumalai/Open_Source/lpython/src/bin/lpython.cpp", line 1545, in ??
    err = compile_python_to_object_file(arg_file, tmp_o, runtime_library_dir, lpython_pass_manager, compiler_options, time_report);
  File "/home/thirumalai/Open_Source/lpython/src/bin/lpython.cpp", line 592, in ??
    !(arg_c && compiler_options.disable_main), infile);
AssertFailed: asr_verify(*tu, true, diagnostics)

I will try to work on this later this week. After that, I think we are ready to start making python packages.

[certik]

Can you open up a dedicated issue for this and close this issue?

[czgdp1807]

@Thirumalai-Shaktivel, @czgdp1807 are we ready now to start making Python packages that compile with LPython?

At least I will start writing code in a modular way and compile it using LPython. Probably by the end of this week or early next week.

[Thirumalai-Shaktivel]

Yup, that would be very helpful. That way, we can test and report any bugs.

[Thirumalai-Shaktivel]

I referenced this as a new issue.

[certik]

Thanks!

#1317